8. Tips and tricks¶
Customizing your .bashrc
¶
.bash_profile
and .bashrc
files. Runtime ~ 8min
Environment variables and aliases. Runtime ~ 14min
Brace expansion¶
mkdir {a..c}-{1..2}.txt
Aliasing¶
alias gst="git status"
History Substitutions¶
Bash stores your history. If you find yourself needing to reuse parts of code, as you often do, use these tricks.
Long complicated command has a typo in the middle? Feel like you have to pull the command down and then go to the error and correct it? Well, just use this syntax:
^[mistake]^[correction
Doing this, bash will pull the previous command and make that single substitution then run it.
The !
symbol stands for “the last line.” Therefore:
!!
- run the last line again. useful if you need to rerun things with more permission, iesudo !!
!$
- this will be replaced by the last word of the last line. useful when youmkdir
and then want to quicklycd
into it!^
- this will be replaced by the first word of the last line. useful when the first word is long, complicated and not able to autocomplete!-[0-9]
- this indicates not the last line, but the [0-9] line beforehand. by itself, it will run the [0-9] line before it.!.*
- This means “run the most recent command that began with this character string.” Useful if that command is who knows how many commands back it was or a command that took in many parameters that would be tedious to type again or find and copy.
More found here: https://www.thegeekstuff.com/2011/08/bash-history-expansion/
Command Substitutions¶
If you have multiple commands on a single line, you may put backticks on the ones that you want to go first. They act as parantheses in math do.
Shell tricks. Runtime ~ 11min