Bash: Tips and Tricks¶

This page contains some Tips and Tricks which are helpful to work with Bash scripts or Terminals. I have mentioned only those tips and tricks which I uses most in my daily routine, BTW you can refer to links which I have shared to know all the tips and tricks.

Tips by `asottile`¶

I will only mention those commands and shortcuts which helpful for me. You can check all of them using below links.

Command: `!!`¶

A substitution which contains the previous command, some useful invocations.

$ ls /proc/1/exe
ls: cannot access '/proc/1/exe': Permission denied

$ sudo !!
sudo ls /proc/1/exe
/proc/1/exe

$ ls /tmp/ | grep sys
systemd-private-e21be514f23449189063b6bd95ec13ef-bolt.service-MCMIaN
systemd-private-e21be514f23449189063b6bd95ec13ef-colord.service-yNWr06
systemd-private-e21be514f23449189063b6bd95ec13ef-fwupd.service-geozA1

$ watch "!!"
watch "ls /tmp/ | grep sys"
(opens up watch panel)

Command: `!$`¶

A substitution which contains the last segment of the previous command.

$ $EDITOR test.py

$ python !$
python test.py
Hello world!

$ mkdir new-project
$ code !$  # Opens the `new-project folder in VSCode

Shortcut: `Ctrl`+`\`¶

Ctrl+\ sends SIGQUIT (default behavior: terminate + produce a core dump) which can be useful to kill things that normally catch Ctrl+c (SIGINT).

Ctrl+\ is more powerful than Ctrl+c.

Additional Tricks¶

Trick: cmd `!!`¶

Run previous command with new command.
Replace previous command with `!!` argument.

$ brew --prefix
/opt/homebrew

$ open `!!`
open `brew --prefix`
# Now Finder.app opens at "/opt/homebrew" path

Uninstall Apps from Mac¶

Unistall and remove all app data from your Mac using this script. For more information see this youtube video.

Go to /Library/LaunchAgents and /Library/LaunchDaemons path.
Check for the login item names and delete them.
This propcess might asks for password.

Bash: Tips and Tricks¶

Tips by asottile¶

Command: !!¶

Command: !$¶

Shortcut: Ctrl+\¶