Most useful unix commands.

[carb987]

What are the most useful unix commands ? or, your favorite commands??

[T6&sfpER35%]

this is a very broad question
can find some basic commands here

to clean up system periodically (once a week) i use these

Remove packages that didn’t install completely.

sudo apt-get autoclean

Remove your apt-cache.

sudo apt-get clean

Remove software dependencies that you don’t need.

sudo apt-get autoremove

clear thumbnails

rm -rfv ~/.cache/thumbnails

clear cache

sudo du -sh /var/cache/apt

update

sudo apt-get update -y

upgrade

sudo apt upgrade

Kernel and other Cleanups after Deletions

sudo apt autoremove --purge

Clear DNS Cache

sudo systemd-resolve --flush-caches

my personal favourite?

windscribe connect

[mastablasta]

mostly i use application commands. i think system is actually made from separate applications that bind into one. for example apt commands are form apt package manager, systemd commands are from systemd. so they won't work if you have old init based linux.
there are probably not that many directly from Linux kernel or base of the system. but you can see some that go back to Unix time. just read about seq command yesterday. at first few examples it seemed pointless, but when more uses were demonstrated, it made it quite interesting. ls, rm, cd and such are probably brought over from unix as well.

[metacell]

sudo apt --fix-broken install

[metacell]

screen

It can be used to create multiple text-based "windows" inside a terminal. Eg, if you want to run a long package update process with lots of text flowing by, you can use screen to put it in the background, and then switch back and forth to watch the progress.

You can also reattach to a screen session if you're forced to restart X, or if your SSH connection is broken, and your programs keep running in the background.

[carb987]

Thank you everyone.
I love du.exe in Windows system. It's convenient for me.

[TheFu]

I have a few aliases for the commands I use most often:

# listings, history
alias ls='ls -F'
alias ll='ls -al'
alias ltm='ls -alt| more'
alias h='history'
alias mkdir='mkdir -p'

alias psg='ps -eaf | grep $*'
alias iproute='ip route | column -t'

# storage
alias du='du -h'
alias df='df -h'
alias dft='df -hT -x squashfs -x tmpfs -x devtmpfs'
alias lsblk='lsblk -e 7 -o name,size,type,fstype,mountpoint'

# private browsing
alias firepchrome='firejail --private chromium-browser --js-flags=--noexpose_wasm --mute-replay-warnings '
alias firepff='firejail --private firefox '

The order of the aliases matter.

Besides those, ssh, rsync, egrep, dd, awk, sed, sort, cut, perl, nmap are extremely useful. For example,

$ lspci -vk |perl -lne 'print if /Ethernet|Network/ .. /^[\w]*$/'