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
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  1. TXT FILES

swapon

swapon

The swapon command in Linux is used to activate swap space on the system. Here’s a detailed explanation:

  1. Purpose:

    • swapon is used to enable and activate swap partitions or swap files on a Linux system. Swap space serves as virtual memory, allowing the system to use disk space when physical RAM is fully utilized.

  2. Usage:

    • Syntax: swapon [options] device

    • Example: swapon /dev/sda2

    • Options:

      • -a: Activate all swap devices listed in /etc/fstab.

      • -v: Verbose mode, providing detailed output about the activation process.

  3. Device Specification:

    • Device: Typically, you specify a device file representing a swap partition (e.g., /dev/sda2) or a swap file (e.g., /swapfile).

    • Swap File Creation: If using a swap file, it needs to be created and initialized with dd and mkswap commands before using swapon.

  4. Considerations:

    • Performance: Activating swap (swapon) helps alleviate memory pressure and prevents out-of-memory situations by utilizing disk space as additional virtual memory.

    • Monitoring: Use tools like free, top, or vmstat to monitor memory and swap usage.

    • Permanent Activation: Modify /etc/fstab to ensure swap devices or files are activated automatically at system boot.

  5. Managing Swap Configuration:

    • Temporary Activation: Use swapon command to activate swap space temporarily during runtime.

    • Permanent Configuration: Update /etc/fstab to include entries for swap devices or files for automatic activation at boot time.

  6. Best Practices:

    • Ensure sufficient swap space relative to physical RAM for optimal system performance.

    • Regularly monitor and adjust swap usage based on system workload and memory demands.

Conclusion

Understanding swapon is essential for Linux administrators and users managing system resources effectively. It provides flexibility in utilizing swap space to improve system performance and manage memory efficiently. Always consider system requirements and workload demands when configuring and monitoring swap usage on Linux systems.

help

Usage:
 swapon [options] [<spec>]

Enable devices and files for paging and swapping.

Options:
 -a, --all                enable all swaps from /etc/fstab
 -d, --discard[=<policy>] enable swap discards, if supported by device
 -e, --ifexists           silently skip devices that do not exist
 -f, --fixpgsz            reinitialize the swap space if necessary
 -o, --options <list>     comma-separated list of swap options
 -p, --priority <prio>    specify the priority of the swap device
 -s, --summary            display summary about used swap devices (DEPRECATED)
     --show[=<columns>]   display summary in definable table
     --noheadings         don't print table heading (with --show)
     --raw                use the raw output format (with --show)
     --bytes              display swap size in bytes in --show output
 -v, --verbose            verbose mode

 -h, --help               display this help
 -V, --version            display version

The <spec> parameter:
 -L <label>             synonym for LABEL=<label>
 -U <uuid>              synonym for UUID=<uuid>
 LABEL=<label>          specifies device by swap area label
 UUID=<uuid>            specifies device by swap area UUID
 PARTLABEL=<label>      specifies device by partition label
 PARTUUID=<uuid>        specifies device by partition UUID
 <device>               name of device to be used
 <file>                 name of file to be used

Available discard policy types (for --discard):
 once    : only single-time area discards are issued
 pages   : freed pages are discarded before they are reused
If no policy is selected, both discard types are enabled (default).

Available output columns:
 NAME   device file or partition path
 TYPE   type of the device
 SIZE   size of the swap area
 USED   bytes in use
 PRIO   swap priority
 UUID   swap uuid
 LABEL  swap label

breakdown

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Last updated 10 months ago