Linux-Cli-Tutorial(by Saman Khalife)
  • Characters
  • Linux Commands
  • Quick review for commands
  • Config file parameters you can use
  • .github
    • ISSUE_TEMPLATE
      • bug_report
  • Editors-for-command-line
  • TOOLs and APPs
    • Iptables
    • Ufw
      • man
  • Git Commands
  • Installing tools and apps
    • Check-used-ports
    • Clear the cache memory in Linux
    • ulimit
    • ulimit
    • Installing WordPress with Apache
    • Installing WordPress with Nginx
    • what packages are installed by apt
    • wildcard characters for globbing
  • Lpic 1
    • LPIC-1 Exam 101 (101-500) Exam
    • LPIC-1 Exam 101 Objectives
    • how to use lvm snapshots
    • LPIC-1 Exam 102 Objectives
  • Lpic 2
    • how to use lvm
    • LPIC-2 Exam 201 Objectives
    • LPIC-1 Exam 102 (102-500) Exam
    • LPIC-2 Exam 202 Objectives
  • Lpic 3
    • LPIC-2 Exam 201 (201-450) Exam
    • LPIC-3 High Availability and Storage Clusters 306 Objectives
    • LPIC-2 Exam 202 (202-450) Exam
    • LPIC-3 Mixed Environments 300 Objectives.md
    • LPIC-3 High Availability and Storage Clusters 306 Exam
    • LPIC-3 Security Exam 303 Objectives
    • LPIC-3 High Availability and Storage Clusters 306 Objectives
    • LPIC-3 Virtualization and Containerization 305 Objectives
  • TXT FILES
    • accept
    • accton
    • aclocal
    • acpi
    • acpid
    • addr2line
    • addresses
    • agetty
    • alias
    • alsactl
    • amidi
    • amixer
    • anacron
    • apachetop
    • aplay
    • aplaymidi
    • apm
    • apmd
    • apropos
    • apt-get
    • apt
    • aptitude
    • ar
    • arecord
    • arecordmidi
    • arp
    • aspell
    • at
    • atd
    • atop
    • aumix
    • autoconf
    • autoheader
    • automake
    • autoreconf
    • autoscan
    • badblocks
    • banner
    • basename
    • batch
    • bc
    • bg
    • biff
    • bind
    • bison
    • break
    • builtin
    • bzcmp
    • bzdiff
    • bzgrep
    • bzip2
    • cal
    • cardctl
    • cardmgr
    • case
    • cat
    • cc
    • ccrypt
    • cd
    • cdparanoia
    • cfdisk
    • chage
    • chdir
    • chfn
    • chgrp
    • chkconfig
    • chmod
    • chown
    • chpasswd
    • chroot
    • chrt
    • chsh
    • chvt
    • cksum
    • clorm
    • cloumn
    • cmp
    • comm
    • compress
    • continue
    • cp
    • cpio
    • cron
    • crond
    • crontab
    • csplit
    • ctags
    • cupsd
    • curl
    • cut
    • cvs
    • date
    • dd
    • ddrescue
    • debugfs
    • declare
    • depmod
    • devdump
    • df
    • diff
    • dig
    • dircolors
    • dirname
    • disable
    • dlpsh
    • dmesg
    • dmidecode
    • dnsdomainname
    • dnssec-makekeyset
    • dnssec-signkey
    • dnssec-signzone
    • dnssec
    • doexec
    • domainname
    • dosfsck
    • dstat
    • du
    • dump
    • dumpe2fs.
    • dumpkeys
    • e2fsck
    • e2image
    • e2label
    • echo
    • ed
    • edquota
    • eject
    • elvtune
    • emacs
    • enable
    • env
    • envsubst
    • esd-config
    • esd
    • esdcat
    • esdctl
    • esddsp
    • esdmon
    • esdplay
    • esdrec
    • esdsample
    • etags
    • ethtool
    • eval
    • ex
    • exec
    • exit
    • expand
    • expect
    • export
    • expr
    • factor
    • false
    • fc-cache
    • fc-list
    • fc
    • fdformat
    • fdisk
    • fg
    • fgrep
    • file
    • find
    • finger
    • flex
    • fmt
    • fold
    • for
    • formail
    • format
    • free
    • fsck
    • ftpd
    • function
    • g++
    • gawk
    • gdb
    • getent
    • getkeycodes
    • getopts
    • goaccess
    • gorupmod
    • gpasswd
    • gpgsplit
    • gpgv
    • gpm
    • gprof
    • grep
    • groff
    • groffer
    • groupadd
    • groupdel
    • groups
    • grpck
    • grpconv
    • gs
    • gunzip
    • gzexe
    • gzip
    • halt
    • hash
    • hdparm
    • head
    • help
    • hexdump
    • history
    • host
    • hostid
    • hostname
    • hostnamectl
    • htdigest
    • htop
    • hwclock
    • iconv
    • id
    • if
    • ifconfig
    • iftop
    • ifup
    • import
    • inetd
    • info
    • init
    • insmod
    • install
    • iostat
    • iotop
    • ip
    • ipcrm
    • ipcs
    • iptables-restore
    • iptables
    • isodump
    • isoinfo
    • isosize
    • isovfy
    • ispell
    • iwconfig
    • jnettop
    • jobs
    • join
    • journalctl
    • kbdrate
    • kill
    • killall
    • klogd
    • kudzu
    • last
    • lastlog
    • ld
    • ldconfig
    • ldd
    • less
    • lesskey
    • let
    • lftp
    • lftpget
    • link
    • ln
    • loadkeys
    • local
    • locate
    • lockfile
    • logger
    • login
    • logout
    • logrotate
    • logwatch
    • look
    • losetup
    • lpadmin
    • lpc
    • lpinfo
    • lpmove
    • lpq
    • lpr
    • lprint
    • lprintq
    • lprm
    • lpstat
    • ls
    • lsatb
    • lsattr
    • lsblk
    • lshw
    • lsmod
    • lsof
    • lspci
    • lsusb
    • mail
    • mailstats
    • make
    • makedbm
    • makemap
    • man
    • manpath
    • mattrib
    • mbadblocks
    • mcat
    • mcd
    • mcopy
    • mdu
    • merge
    • mesg
    • mformat
    • mkdir
    • mkfs
    • mkraid
    • mktemp
    • mlabel
    • mmove
    • modinfo
    • LPIC-3 Mixed Environments 300 Exam
    • most
    • mount
    • mountd
    • mpartition
    • mpstat
    • mv
    • named
    • nameif
    • neofetch
    • netcat
    • netstat
    • newaliases
    • newgrp
    • newusers
    • nfsstat
    • nice
    • nl
    • nm
    • nmcli
    • nohup
    • nslookup
    • nsupdate
    • objcopy
    • objdump
    • od
    • op
    • open
    • openvt
    • passwd
    • paste
    • patch
    • pathchk
    • pgrep
    • pidof
    • ping
    • pkill
    • pmap
    • popd
    • portmap
    • poweroff
    • pppd
    • pr
    • praliases
    • printcap
    • printenv
    • printf
    • ps
    • ptx
    • pushd
    • pv
    • pwck
    • pwconv
    • pwd
    • quota
    • quotacheck
    • quotactl
    • quotaoff
    • quotaon
    • quotastats
    • raidstart
    • ram
    • ramsize
    • ranlib
    • rar
    • rarpd
    • rcp
    • rdev
    • rdist
    • read
    • readarray
    • readcd
    • readelf
    • readlink
    • readonly
    • reboot
    • reject
    • rename
    • renice
    • repquota
    • reset
    • restore
    • return
    • rev
    • rexecd
    • rlogin
    • rlogind
    • rm
    • rmail
    • rmdir
    • rmmod
    • rndc
    • rootflags
    • route
    • routed
    • rpcgen
    • rpcinfo
    • rpm
    • rsh
    • rshd
    • rsync
    • runlevel
    • rup
    • rusers
    • rusersd
    • rwall
    • rwho
    • rwhod
    • sane-find-scanner
    • sar
    • scanadf
    • scanimage
    • scp
    • screen
    • script
    • scriptreplay
    • sdiff
    • sed
    • select
    • sensors
    • seq
    • service
    • set
    • setfdprm
    • setkeycodes
    • setleds
    • setmetamode
    • setquota
    • setsid
    • setterm
    • sftp
    • sh
    • shift
    • shopt
    • showkey
    • showmount
    • shred
    • shutdown
    • skill
    • slabtop
    • slacttach
    • sleep
    • slocate
    • snice
    • sort
    • source
    • split
    • ss
    • ssh-add
    • ssh-agent
    • ssh-keygen
    • ssh-keyscan
    • ssh
    • stat
    • statd
    • strfile
    • strings
    • strip
    • stty
    • su
    • sudo
    • sum
    • suspend
    • swapoff
    • swapon
    • symlink
    • sysctl
    • sysklogd
    • syslogd
    • systemctl
    • Systemd
    • tac
    • tail
    • tailf
    • talkd
    • tar
    • taskset
    • tcpdump
    • tcpslice
    • tee
    • telinit
    • telnet
    • terminator
    • tfdp
    • tftpd
    • tmpwatch
    • top
    • touch
    • tput
    • tr
    • tracepath
    • traceroute
    • trap
    • tree
    • tset
    • tty
    • tune2fs
    • tunelp
    • type
    • ul
    • unalias
    • uname
    • uncompress
    • unexpand
    • unicode_start
    • unicode_stop
    • uniq
    • units
    • unix2dos
    • unshar
    • until
    • uptime
    • useradd
    • usermod
    • usleep
    • uudecode
    • uuencode
    • uuidgen
    • vidmode
    • vmstat
    • vnstat
    • w
    • wall
    • warnquota
    • watch
    • wc
    • wget
    • whatis
    • which
    • while
    • who
    • whoami
    • write
    • xargs
    • xdg-open
    • xinetd
    • xz
    • yacc
    • ypbind
    • ypcat
    • ypinit
    • ypmatch
    • yppasswd
    • yppasswdd
    • yppoll
    • yppush
    • ypset
    • yptest
    • ypwhich
    • ypxfr
    • zcat
    • zcmp
    • zdiff
    • zdump
    • zforce
    • zgrep
    • zic
    • zip
    • zless
    • znew
    • readme
      • Some basic info about Cloud Computing model and SRE's
      • Ansible Automation
      • Backup and Recovery
      • Linux File Systems and Storage Management
      • Linux Networking
      • shell-scripting
      • LPIC-3 Mixed Environments 300 Objectives
    • File-systems-Cocepts
      • LPIC1-101
        • LPIC-3 Security Exam 303 Exam
        • /dev/
        • /etc/apt/sources.list
        • /etc/fstab
        • /etc/init.d/
        • LPIC-3 Virtualization and Containerization 305 Exam
        • /etc/ld.so.conf
        • /etc/systemd
        • /etc/yum.conf
        • /etc/yum.repos.d/
        • LPIC-3 Virtualization and Containerization 305 Objectives
        • /media
        • /proc/
        • modprobe
        • /sys/
        • /usr/lib/systemd/user/
        • -boot
        • .bash_history
        • Application container
        • BIOS
        • D-Bus machine ID
        • EFI System Partition
        • Guest drivers
        • LD_LIBRARY_PATH
        • Linux containers
        • MBR
        • Quoting
        • SSH host keys
        • SysVinit
        • UEFI
        • VFAT
        • VMs
        • XFS
        • -etc-inittab
        • -home
        • bootloader
        • -root
        • -var
        • dpkg-reconfigure
        • apt-cache
        • bash
        • exFAT
        • ext2/ext3/ext4
        • bunzip2
        • bzcat
        • dpkg
        • Grub-install
        • grub-mkconfig
        • initramfs
        • kernel
        • egrep
        • file globbing
        • filesystem
        • gdisk
        • menu.lst, grub.cfg and grub.conf
        • Partitions
        • regex(7)
        • rpm2cpio
        • sha256sum
        • sha512sum
        • mke2fs
        • mkswap
        • mount points
        • parted
        • swap space
        • tmux
        • umask
        • umount
        • unset
        • unxz
        • updatedb
        • whereis
        • xfs_db
        • xfs_fsr
        • xfs_repair - Copy (2)
      • LPIC1-102
        • xfs_repair
        • xzcat
        • yum
        • zypper
        • -etc-X11-xorg.conf
        • -etc-X11-xrog.conf.d
        • -etc-at.allow
        • -etc-at.deny
        • -etc-bash.bashrc
        • -etc-chrony.conf
        • -etc-cron.allow
        • -etc-cron.deny
        • -etc-cron
        • -etc-crontab
        • -etc-cups
        • -etc-group
        • -etc-hostname
        • -etc-hosts.allow
        • -etc-hosts.deny
        • -etc-hosts
        • -etc-init.d-
        • -etc-inittab
        • -etc-localhost
        • -etc-localtime
        • -etc-logrotate.conf
        • -etc-logrotate.d-
        • -etc-nologin
        • -etc-nsswitches.conf
        • -etc-nto.conf
        • -etc-ntp.conf
        • -etc-passwd
        • -etc-profile
        • -etc-resolv.conf
        • -etc-rsyslog.conf
        • -etc-services
        • -etc-shadow
        • -etc-skel-
        • -etc-ssh-ssh_host_dsa_key and ssh_host_dsa_key.pub
        • -etc-ssh-ssh_host_ecdsa_key and ssh_host_ecdsa_key.pub
        • -etc-ssh-ssh_host_ed25519_key and ssh_host_ed25519_key.pub
        • -etc-ssh-ssh_host_rsa_key and ssh_host_rsa_key.pub
        • -etc-sudoers
        • -etc-systemd-journald.conf
        • -etc-timezone
        • -etc-updatedb.conf
        • -etc-xinetd.conf
        • -etc-xinetd.d-
        • -usr-bin-locale
        • -usr-share-zoneinfo
        • -usr-share-zoninfo
        • -var-log-journal
        • -var-log
        • DISPLAY
        • -var-spool-cron
        • ASCII
        • Gnome
        • Braille Display.
        • CUPS configuration files, tools and utilities
        • Gesture
        • KDE
        • Gestures.
        • High ContrastLarge Print Desktop Themes.
        • IPv4-IPv6
        • ISO-8859
        • LANG
        • LC_
        • LC_ALL
        • Logical OR
        • Mouse keys
        • On-Screen Keyboard.
        • RDP
        • Screen Magnifier.
        • Screen Reader
        • Slow-Bounce-Toggle keys
        • Spice
        • Sticky-Repeat keys
        • Subnetting
        • TCP-UDP-ICMP
        • TZ
        • X
        • UTF-8
        • XDMCP
        • Xfce
        • Unicode
        • VNC
        • Voice recognition
        • X11
        • atq
        • atrm
        • chronyc
        • exim
        • fuser
        • gpg-agent
        • gpg
        • groupmod
        • ifdown
        • logic and
        • logic or
        • lpd legacy interface
        • mailq
        • nmap
        • ntpd
        • ntpdate
        • ping6
        • pool.ntp.org
        • postfix
        • sendmail emulation layer commands
        • sendmail
        • ssh_known_hosts
        • systemd-cat
        • systemd-run
        • systemd.socket
        • test
        • timedatectl
        • tracepath6
        • traceroute6
        • tzselect
        • xauth
        • ulimit
        • unset
        • userdel
        • who, w, last
        • xhost
        • ~-.bash_login
        • ~-.bash_logout
        • ~-.bash_profile
        • ~-.bashrc
        • ~-.forward
        • ~-.gnupg-
        • ~-.profile
        • ~-.ssh-authorized_keys
        • ~-.ssh-id_dsa and id_dsa.pub
      • LPIC2-201
        • /bin/dmesg
        • /bin/uname
        • Device Naming Conventions
        • /dev/mapper/
        • /etc/auto.[dir]
        • /etc/auto.master
        • ~-.ssh-id_ecdsa and id_ecdsa.pub
        • /etc/hostname and /etc/HOSTNAME
        • /etc/hosts.allow , /etc/hosts.deny
        • /etc/hosts
        • /etc/init.d/
        • /etc/inittab
        • /etc/mtab
        • /etc/network and /etc/sysconfig/network-scripts
        • /etc/rc.d/
        • /etc/resolv.conf
        • /etc/sysctl.conf
        • /etc/systemd/
        • /etc/udev/
        • /proc/mdstat
        • ~-.ssh-id_ed25519 and id_ed25519.pub
        • /proc/sys/kernel/
        • /run/systemd/
        • /sbin/depmod
        • /sbin/insmod
        • /sbin/lsmod
        • /sbin/lspci
        • lv
        • /sbin/modinfo
        • /sbin/modprobe
        • pv
        • /sbin/rmmod
        • ~-.ssh-id_rsa and id_rsa.pub
        • LVM Volume Group (vg)
        • /usr/bin/lsdev
        • /usr/bin/lsusb
        • /usr/src
        • EFI System Partition (ESP)
        • GRUB
        • Master boot record
        • ~-.xsesion-errors
        • /boot , /boot/grub , /boot/efi
        • UEFI shell
        • WWID, WWN, LUN numbers
        • blkid
        • blocks in
        • blocks out
        • btrfs, btrfs-convert
        • bzImage
        • -etc-fstab
        • configure
        • cryptsetup
        • diagnose
        • dkms
        • efiboot.img
        • efibootmgr
        • Extlinux
        • fsck
        • -proc-mounts
        • fstrim Command
        • grub-install
        • -sbin-sysctl
        • System log files such as -var-log-syslog, -var-log-messages and the systemd journal
        • initrd and initramfs
        • SysV Init Overview
        • iSCSI Components
        • isohdpfx.bin
        • ISOLINUX
        • chkconfig
        • iw
        • iwlist
        • lib/modules/kernel-version/modules.dep
        • fsck
        • lvm.conf
        • make targets
        • mdadm.conf
        • mdadm
        • mkfs
        • mkinitramfs
        • mkinitrd
        • mkisofs
        • mkswap
        • /etc/modprobe.d/
        • module tools
        • mount and umount
        • hdparm, sdparm
        • mtr (My Traceroute)
        • Netcat(nc)
        • Nmap
        • NVMe (Non-Volatile Memory Express)
        • partition type 0xFD
        • ping , ping6
        • predict growth
        • processes blocked on IO
        • pxelinux.0
        • pxelinux.cfg/
        • resource exhaustion
        • smartd, smartctl
        • init and telinit
        • isolinux.cfg
        • sync
        • sysctl
        • syslinux
        • lib-modules-kernel-version
        • systemd-delta
        • mount
        • swapoff
        • tune2fs
        • udevadm monitor
        • udevmonitor
        • uefi-grubx64.efi
        • uefi-shim.efi
        • update-rc.d
        • /usr/lib/systemd/
        • usr-src-linux-.config
        • /usr/src/linux
        • /usr/src/linux/Documentation/
        • Xfs_info, Xfs_check, Xfs_repair, Xfsdump and Xfsrestore
        • XZ
        • zImage
      • LPIC2-202
        • /etc/aliases
        • /etc/dovecot
        • /etc/exports
        • /etc/fstab
        • named.conf
        • /etc/nginx
        • /etc/openvpn
        • /etc/passwd
        • /etc/postfix/
        • /etc/samba/
        • /etc/services
        • /etc/ssh/sshd_config
        • /etc/ssh
        • -etc-ssl-, -etc-pki-
        • /proc/mounts
        • /proc/sys/net/ipv4/
        • /proc/sys/net/ipv6/
        • /etc/samba/
        • /var/named/
        • swapon
        • systemctl
        • .htaccess Files
        • Apache2 configuration files
        • AuthUserFile, AuthGroupFile
        • Conditions and comparison operators
        • Configuration files and commands for postfix
        • DHCP Log Messages in Syslog or Systemd Journal
        • DNSSEC
        • traceroute, traceroute6
        • LDIF (LDAP Data Interchange Format)
        • PermitRootLogin, PubKeyAuthentication, AllowUsers, PasswordAuthentication, Protocol
        • Private and public key files
        • SSLCACertificateFile, SSLCACertificatePath
        • SSLEngine, SSLCertificateKeyFile, SSLCertificateFile
        • SSLProtocol, SSLCipherSuite, ServerTokens, ServerSignature, TraceEnable
        • Access Logs:
        • ACL
        • apachectl, apache2ctl
        • tune2fs, dumpe2fs and debugfs
        • dhcpd.conf
        • dhcpd.leases
        • dhcpd
        • dnssec-keygen
        • dnssec-signzone
        • doveadm
        • doveconf
        • dovecot.conf
        • /etc/pam.d
        • exportfs
        • Fail2ban
        • htpasswd
        • http_access
        • httpd, apache2
        • httpd.conf
        • Important Pure-FTPd command line options
        • ip6tables
        • -var-named
        • ldapadd
        • ldapdelete
        • ldappasswd
        • ldapsearch
        • -var-spool-postfix
        • Mail-related logs in /var/log/
        • Master File Format in DNS
        • mod_auth_basic, mod_authz_host and mod_access_compat
        • mount.cifs
        • named-checkconf
        • named-checkzone
        • named-compilezone
        • net
        • Dovecot vacation extension
        • nsswitch.conf
        • OpenSSL
        • OpenVPN
        • pam.conf
        • pam_unix, pam_cracklib, pam_limits, pam_listfile, pam_sss
        • portmapper
        • radvd.conf
        • radvd
        • Resource Record Formats
        • rpcinfo
        • samba-tool
        • Sendmail emulation layer commands
        • slapadd
        • slapcat
        • slapd-config
        • arp
        • keep, fileinto, redirect, reject, discard, stop
        • smbclient
        • Additional Samba Commands: smbcontrol, smbstatus, testparm, smbpasswd, nmblookup
        • SMB Daemons: smbd, nmbd, winbindd
        • squid.conf
        • sshd
        • sssd.conf
        • loglevel
        • vsftpd.conf
        • zone file syntax
      • LPIC3-300
        • IPC$
        • [homes]
        • tunefs.ocfs2
        • vgchange
        • vgcreate
        • HKLM\Software\Samba
        • LDIF (LDAP Data Interchange Format)
        • Microsoft-ADSI-Edit
        • Microsoft-LDP
        • microsoft mmc
        • Microsoft RSAT Tools
        • Microsoft Regedit
        • REG_SZ and REG_MULTI_SZ
        • SeDiskOperatorPrivilege
        • vgdisplay
        • Virtual Machine Generation Identifier
        • Virtual Machine Snapshots
        • allow-dns-updates
        • vgreduce
        • vgreduce
        • vgreduce
        • chmod
        • chown
        • cifscreds
        • cifsiostat
        • config backend
        • vgreduce
        • create-mask and create-mode
        • ifenslave
        • log level (or debuglevel) in Samba
        • delete veto files
        • dig
        • Directory Mask and Force Directory Mode
        • dns-forwarder
        • /etc/exports
        • /etc/fstab
        • /etc/group
        • /etc/idmapd.conf
        • ip
        • /etc/nsswitch.conf
        • /etc/pam.conf
        • /etc/pam.d/
        • /etc/group
        • /etc/resolv.conf
        • exportfs
        • ipvsadm
        • force-create-mode
        • force-directory-mode
        • force group
        • force-user
        • getcifsacl
        • getent
        • getfacl
        • getfattr
        • gpupdate
        • keepalived-configuration-file
        • kpartx
        • ldirectord-configuration-file
        • loadbalancing-algorithms
        • lvchange
        • lvconvert
        • host
        • lvcreate
        • lvdisplay
        • idmap-config
        • idmap_ad
        • lvextend
        • idmap_ldap
        • idmap_rfc2307
        • idmap_rid
        • idmap_tdb
        • idmap_tdb2
        • include
        • inherit-acls
        • lvreduce
        • FreeIPA (IPA)
        • ipa
        • ipa
        • IPA
        • ipa-adtrust-install
        • ipa-advice
        • ipa-client-install
        • ipa-replica-install
        • ipa-replica-prepare
        • ipa-server-install
        • ipactl
        • ipctl
        • kdestroy
        • kinit
        • klist
        • krb5.conf
        • lvresize
        • ldbadd
        • ldbdel
        • ldbedit
        • ldbmodify
        • ldbsearch
        • libnss_winbind
        • libpam_winbind
        • mdadm
        • log level (or debuglevel) in Samba
        • logon-path
        • logon-script
        • map-acl-inherit
        • mount
        • mount.cifs
        • mount Command
        • mkfs.gfs2
        • mkfs.ocfs2
        • multicast dns register
        • net
        • monit
        • net ads
        • net registry
        • nfs4_editfacl
        • nfs4_getfacl
        • nfs4_setfacl
        • nmbd (NetBIOS Name Service Daemon)
        • ntpd.conf
        • ntpsigndsocket
        • mount.gfs2
        • mount.ocfs2
        • mounted.ocfs2
        • multipath
        • nmcli
        • pam_mount.conf.xml
        • pam_mount.so
        • pam_smbpass.so
        • nvme-cli
        • passdb-backend
        • o2image
        • pdbedit
        • o2info
        • ocfpacemakerHealthCPU
        • ocfpacemakerHealthSMART
        • profile-acls
        • rdesktop
        • ocfpacemakerNodeUtilization
        • realm
        • Registry shares
        • registry.tdb in Samba
        • robocopy
        • ocfpacemakerocfSysInfo
        • rpcclient
        • rsync.conf
        • rsync
        • samba regedit
        • samba-tool dbcheck
        • samba-tool dns
        • ocfpacemakerping
        • samba-tool domain backup
        • samba-tool domain backup
        • samba-tool domain exportkeytab
        • samba-tool domain passwordsettings
        • pcs
        • pvcreate
        • samba-tool gpo
        • samba-tool group
        • samba-tool ntacl
        • pvdisplay
        • samba-tool spn
        • samba-tool user
        • Samba
        • samba_dnsupdate
        • secrets.tdb in Samba
        • security
        • server role
        • server services
        • server string
        • setcifsacl
        • setfacl
        • sharesec
        • smb-encrypt
        • smb.conf
        • smbcacls
        • smbclient
        • smbcontrol
        • smbcquotas
        • smbd (Samba Daemon)
        • smbget
        • smbpasswd
        • pvmove
        • smbstatus
        • smbtar
        • pvremove
        • pvresize
        • sss_cache
        • sss_debuglevel
        • sss_override
        • sss_user and sss_group
        • sssd.conf
        • rados-(including-relevant-subcommands)
        • store-dos-attributes
        • systemctl
        • tdbbackup
        • tdbdump
        • tdbrestore
        • tdbtool
        • template-homedir
        • template-shell
        • testparm
        • tls-cafile
        • tls-certfile
        • tls-dh-params-file
        • tls-enabled
        • tls-keyfile
        • rdb(including-relevant-subcommands)
        • /var/lib/samba/sysvol/
        • /var/lib/sss/db
        • /var/log/samba/
        • sbd
        • smartctl
        • vfs objects
        • vfs_acl_tdb
        • vfs_acl_xattr
        • wbinfo
        • winbind-enumerate-groups
        • smartd
        • winbind-offline-logon
        • winbind-separator
        • winbindd
        • workgroup
        • stonith
        • stonith_admin
      • LPIC3-303
        • /etc/aide/aide.conf
        • /etc/crypttab
        • /etc/openvas/
        • /etc/openvpn/
        • /etc/raddb/
        • /etc/rkhunter.conf
        • /etc/security/limits.conf
        • /etc/selinux/
        • /etc/snort
        • /etc/ssh/sshd_config
        • /etc/ssh
        • /etc/strongswan.conf
        • /etc/strongswan.d/.
        • /etc/swanctl/
        • /etc/swanctl/swanctl.conf
        • /etc/sysctl.conf
        • /etc/usbguard/rules.conf
        • /etc/usbguard/usbguard-daemon.conf
        • /etc/wireguard/
        • /proc/cgroups
        • nginx
        • slapd
        • ARP and NDP
        • Brute force attacks
        • Buffer overflows
        • CRL (Certificate Revocation List)
        • CSR (Certificate Signing Request)
        • CSRF
        • XSS
        • DoS and DDoS
        • keylogger
        • Link layer address and IP address spoofing
        • Man-in-the-Middle
        • OCSP (Online Certificate Status Protocol)
        • OpenSSL Configuration
        • PEM, DER, PKCS
        • Phishing
        • Privilege escalation
        • Rainbow tables
        • Rogue access points, routers, and DHCP servers
        • Rootkits
        • SQL and codes injection
        • Social engineering
        • slapindex
        • varlibldap
        • aide
        • apol
        • audit.rules
        • audit2allow
        • audit2why
        • auditctl
        • auditd.conf
        • auditd
        • ausearch, aureport
        • -sys-fs-group-
        • capsh
        • chcon
        • chkrootkit
        • chroot
        • conf.maldet
        • cryptmount
        • cryptsetup (Disk Encryption Setup)
        • delv
        • dnssec-dsfromkey
        • -sys-fs-group
        • dnssec-settime
        • Trojans
        • dpkg
        • ecryptfs- commands
        • ecryptfsd
        • fixfiles
        • getcap
        • getenforce
        • getfacl
        • getfattr
        • getsebool
        • grub.cfg
        • httpd.conf (Apache HTTP Server Configuration)
        • ip6tables-restore
        • ip6tables-save
        • ip6tables
        • ipset
        • iptables-save
        • iptables
        • Kismet
        • Linux Malware Detect (maldet)
        • mod_ssl (Apache SSL Module)
        • mount.ecryptfs, umount.ecryptfs
        • named.conf
        • ndpmon
        • newrole
        • ntop
        • openssl
        • openvas-adduser
        • openvas-feed-update
        • openvas-mkcert
        • openvas-nvt-sync
        • openvas-rmuser
        • openvassd
        • OpenVPN
        • pam_ecryptfs
        • pam_limits.so
        • pam_tty_audit.so
        • pulledpork.pl
        • radclient
        • radiusd.conf
        • radiusd
        • Viruses
        • radmin
        • radtest
        • radwho
        • restorecon
        • rkhunter
        • rndc
        • c
        • seaudit
        • seinfo
        • selinuxenabled
        • semanage
        • sestatus
        • setcap
        • setcon
        • setenforce
        • setfacl
        • setfattr
        • setfiles
        • setsebool
        • snort-stat
        • snort
        • ssh-keygen
        • swanctl
        • sysctl
        • systemctl
        • systemd-cgls
        • systemd-cgtop
        • Tcpdump
        • togglesebool
        • tshark
        • dnssec-keygen
        • usbguard
        • wg-quick
        • wg
        • wireshark
        • ~/.ssh/
      • LPIC3-305
        • -dev-kvm-
        • /etc/docker/daemon.json
        • /etc/libvirt — Libvirt Configuration Directory
        • -proc -[0-9]+-status
        • -proc-[0-9]+-ns
        • -sys-fs-cgroups
        • /var/lib/cloud
        • /var/lib/docker
        • CPU-flags
        • Dockerfile
        • Domain0(Dom0),DomainU (DomU)
        • Emulation and Simulation
        • Hardware Virtual Machine (HVM)
        • IaaS, PaaS, SaaS
        • Kernel-modules-kvm,kvm-intel.and.kvm-amd
        • Migration (P2V, V2V)
        • OpenStack
        • PV-DomU,HVM-DomU
        • Paravirtualization (PV)
        • QEMU Monitor
        • Terraform
        • Vagrantfile
        • brctl — Bridge Control Utility
        • capsh
        • cloud-init
        • syncd
        • dockerd
        • etc-xen-
        • guestumount — Virtual Disk Image Unmounting Tool
        • guestmount
        • guestumount
        • Hypervisor
        • ip(including-relevant-subcommands)
        • ip — Network Management Command
        • libvirtd — Libvirt Daemon (Legacy Central Virtualization Daemon)
        • LXC (Linux Containers)
        • LXD (Linux Container Daemon)
        • nsenter
        • Packer
        • tunefs.ocfs2
        • qemu-img — QEMU Disk Image Utility
        • vgchange
        • qemu — Quick Emulator
        • tunctl — TUN/TAP Device Control Utility
        • unshare
        • user-data
        • vagrant
        • virsh — Virtualization Shell for Managing VMs
        • virt-cat
        • virt-copy-in
        • virt-copy-out
        • virt-df
        • virt-diff
        • virt-filesystems
        • virt-inspector
        • virt-p2v-make-disk
        • virt-p2v
        • virt-rescue
        • virt-resize
        • virt-sparsify
        • virt-sysprep
        • virt-v2v
        • xentop
        • xl.cfg
        • xl.conf
        • xl
      • LPIC3-306
        • /etc/drbd.conf
        • /etc/drbd.d/
        • /etc/lvm/lvm.conf Configuration File
        • /etc/multipath.conf
        • /etc/network/interfaces
        • /etc/smartd.conf
        • /etc/sysconfig/networking-scripts/ifcfg-*
        • /etc/systemd/network/*.netdev
        • /etc/systemd/network/*.network
        • /proc/drbd
        • /proc/mdstat
        • /proc/sys/dev/raid
        • -sys-class-net-bond-bonding-miimon
        • -sys-class-net-bond-bonding-slaves
        • -sys-class-net-bonding_masters
        • Access Control Lists (ACLs)
        • Active-Active Cluster
        • vgcreate
        • Cluster Services
        • Disaster Recovery (DR)
        • Failover Cluster
        • Fencing (Node and Resource Level Fencing)
        • HAProxy Configuration File
        • LVS Forwarding Methods
        • Load-Balanced Cluster
        • Mean Time Before Failure (MTBF)
        • Mean Time To Repair (MTTR)
        • Primary, Secondary
        • ProtocolA,BandC
        • Quorum
        • Redundancy
        • Replication
        • Service-Level Agreement (SLA)
        • Session-Handling
        • Shared-Disk Cluster
        • Shared-Nothing Cluster
        • Split-Brain
        • State-Handling
        • Three-way replication
        • active-passive-cluster
        • apctest
        • apcupsd
        • authkeys
        • bonding.ko
        • Ceph
        • ceph-authtool
        • ceph-bluestore-tool
        • ceph-deploy
        • ceph-volume
        • ceph.conf
        • CephFS
        • cibadmin
        • connection-scheduling-algorithms
        • corosync-cfgtool
        • corosync-cmapctl
        • corosync-quorumtool
        • corosync.conf
        • crm
        • crm_attribute
        • crm_mon
        • crm_node
        • crm_resource
        • crm_shadow
        • crm_simulate
        • crm_standby
        • crm_verify
        • crushtool
        • DRBD Kernel Module
        • drbdadm
        • drbdmeta
        • drbdsetup
        • vgdisplay
        • fsck.ocfs2
        • genhash
        • gfs2_edit
        • gfs2_grow
        • gfs2_jadd
        • gluster
        • ifenslave Command
        • ip Command
        • ipvsadm
        • iscsiadm
        • iscsid.conf
        • Keepalived Configuration File
        • kpartx
        • ldirectord Configuration File
        • loadbalancing-algorithms
        • vgreduce
        • lvconvert
        • lvcreate
        • lvdisplay
        • lvextend
        • lvreduce
        • lvresize
        • mdadm
        • mkfs.gfs2
        • mkfs.ocfs2
        • Monit
        • mount.gfs2
        • mount.ocfs2
        • mounted.ocfs2
        • multipath
        • nmcli
        • nvme-cli
        • o2image
        • o2info
        • ocf:pacemaker:HealthCPU
        • ocf:pacemaker:HealthSMART
        • ocf:pacemaker:NodeUtilization
        • ocf:pacemaker:ocfSysInfo
        • ocf:pacemaker:ping
        • pcs
        • pvcreate
        • pvdisplay
        • pvmove
        • pvremove
        • pvresize
        • rados
        • rbd
        • authkey
        • smartctl
        • smartd
        • bonding.ko-(including-relevant-module-options)
        • stonith
        • stonith_admin
        • syncd
        • targets.conf
        • tgtadm
        • tunefs.ocfs2
        • vgchange
        • vgcreate
        • vgdisplay
        • vgreduce
  • Security attacks full list
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chfn

cdfn

The chfn command in Linux is used to change the finger information for the current user. Finger information is a set of data that is displayed by the finger command. It typically includes the user's name, real name, office number, and other contact information.

The chfn command is used in the following syntax:

chfn [options]

The options can be used to specify the following:

  • -f : Change the full name.

  • -o : Change the office number.

  • -h : Change the home phone number.

  • -w : Change the work phone number.

  • -s : Change the shell.

For example, the following code will change the full name and office number for the current user:

chfn -f "John Doe" -o "123-456-7890"

This code will change the full name to "John Doe" and the office number to "123-456-7890".

The chfn command is a simple and useful command that can be used to change the finger information for the current user. It is a valuable command to know, especially if you need to update your contact information.

Here are some additional things to note about the chfn command:

  • The chfn command can be used to change the finger information for any user.

  • The chfn command requires root privileges to change the finger information for other users.

  • The chfn command is available on all Linux distributions.

I hope this helps! Let me know if you have any other questions.

help

Usage: chfn [options] [LOGIN]

Options:
  -f, --full-name FULL_NAME     change user's full name
  -h, --home-phone HOME_PHONE   change user's home phone number
  -o, --other OTHER_INFO        change user's other GECOS information
  -r, --room ROOM_NUMBER        change user's room number
  -R, --root CHROOT_DIR         directory to chroot into
  -u, --help                    display this help message and exit
  -w, --work-phone WORK_PHONE   change user's office phone number
      --extrausers              Use the extra users database
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Last updated 1 year ago