I have mostly replaced all command line stuff with Emacs, but there are still a few CLI utilities that I continue to use, whether I am in the CLI directly or whether I am using Emacs:
tmux
orscreen
(terminal multiplexing)bash
(shell scripting)grep
,sed
(filtering, formatting)ps
,pgrep
,pkill
(process control)ls
,find
,du
(filesystem search)ssh
,nc
,rsync
,sshfs
,sftp
(remote access, file transfer)tee
,dd
(pipe control)less
,emacs
,diff
,patch
,pandoc
(text editing)man
,apropos
(manual)tar
,gzip
,bzip2
,xz
(archiving)hexdump
,base64
,basenc
,sha256sum
(data encoding, checksums)wget
,curl
, (HTTP client)dpkg
,apt-get
,guix
(package management)mpv
(media player)ldd
,objdump
,readelf
(inspecting binary files)zfs
(maintaining my backup filesystem)