The "cddir" command you mentioned, "cddir --help," is not a standard command in Linux systems.
Usage: cal [general options] [-jy] [[month] year]
cal [general options] [-j] [-m month] [year]
ncal -C [general options] [-jy] [[month] year]
ncal -C [general options] [-j] [-m month] [year]
ncal [general options] [-bhJjpwySM] [-H yyyy-mm-dd] [-s country_code] [-W number of days] [[month] year]
ncal [general options] [-Jeo] [year]
General options: [-31] [-A months] [-B months] [-d yyyy-mm]
root@Saman:~# ^C
root@Saman:~# chdir --help
Command 'chdir' not found, did you mean:
command 'cdir' from deb cdtool (2.1.8-release-8)
command 'hdir' from deb hfsutils (3.2.6-15build2)
Try: apt install <deb name>