Cheat Sheets


Created: 2017 October 11th

Updated: 2020 August 27th

Edit this page on GitHub

Change default shell

Use chsh utility to change your default shell:

1# list out the shells available with -l
2chsh -l
3# if that doesn't work try
4cat /etc/shells
5# /bin/bash
6# /bin/zsh
7# /bin/fish
8# set the default shell (with -s) to fish
9chsh -s /bin/fish
10# set the default shell (with -s) to zsh
11chsh -s /bin/zsh

Kill process on port

List any process running on port 8000

1lsof -i:8000

Output will look similar to this.

2chrome 16085 iamuser

Then kill it with kill.

1kill -9 16085

Add an alias

1# open your bash_profile with nano
2nano ~/.bash_profile
3# add your alias
4alias f='fish'
5# ctrl+x then y to save

Sort alphabetically

You may find that commands like ll are under your ~/.bashrc file, if not then add the following as an alias:

1ls -lart | sort -k9,9

See file permissions

If you need to set the permission on a file (with chmod) but don’t know what the permissions of similar files are like you can use stat, the following command displays the permissions of the contents of the .ssh/ folder:

1stat -c "%a %n" ~/.ssh/*

Open the SSH agent each time you open a new terminal.

Tired of having to enter your SSH password each time you want to do a git operation?

Add the following to your ~/.bashrc file.

1# nano ~/.bashrc
2[ -z "$SSH_AUTH_SOCK" ] && eval "\$(ssh-agent -s)"

Search Bash history

Want to search for an entry in your Bash history?

Use Ctrl+r then enter your search term.

Remove command from bash history

Accidentally added your password as a bash command?

To remove that from the bash history:

1# list out history with

Then take the number from the output:

1471 ssh-agent
2472 exit
3473 kill 53111
4474 super secret password
5475 history

Then delete the line you want removed:

1history -d 474

Check your history again and gone until you do it again.

Move the contents of a folder to another folder

This will move everything in the Downloads folder to the Videos folder including any folders inside Downloads.

1mv ~/Downloads/* ~/Videos