My favorite command line one-liners (from Linux Comand Library) 🤓

🔗 The list originally from here.

List directories only:

• ls -d */

Quickly rename a file - one day, this will be me! 😎:

• mv filename.{old,new}

Create a quick back-up copy of a file:

• cp file.txt{,.bak}

Delete all files in a folder that don't match a certain file extension:

• rm !(*.foo|*.bar|*.baz)

Remove all but one specific file 💪:

• rm -f !(survivior.txt)

Convert filenames in current directory to lowercase:

• rename 'y/A-Z/a-z/' *

Remove all spaces from all files in current the folder (super useful!):

• rename 's/ //g' *

Diff two unsorted files without creating temporary files:

• diff <(sort file1) <(sort file2)

Rapidly invoke an editor to write a long, complex, or tricky command. I've never really had the use for this one, but I dream of a day when I'll be writing bash scipts...

• ctrl+x + e

List of commands you use most often (there's also an oh-my-zsh command that does the same, but I just couldn't find it... 🤔):

• history | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head

3390 git
1179 g # alias for git
548 cd
333 go # git alias for checkout
321 j # alias for autojump
295 touch
270 npm
215 yarn
209 code # vscode
151 kill # oopsie lots of 🔪

Quick access to the ascii table (specifically, the decimal set 👍):

• man ascii

Show File System Hierarchy:

• man hier

Create a pdf version of a manpage:

• man -t manpage | ps2pdf - filename.pdf Maybe useful 🤷‍♀️?

Show apps that use internet connection at the moment:

• lsof -P -i -n

Remove security limitations from PDF documents using ghostscript (untested 😅):

• gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=OUTPUT.pdf -c .setpdfwrite -f INPUT.pdf

Get the biggest files/folders for the current directory:

• du -s * | sort -n | tail

Shows size of dirs and files, hidden or not, sorted:

• du -cs * .[^\.]* | sort -n

Remind yourself to leave in 15 minutes (note: To get rid of leave you should either log off or use kill -s KILL 😬):

• leave +15

Download all images from a site:

• wget -r -l1 --no-parent -nH -nd -P/tmp -A".gif,.jpg" http://example.com/images

Save command output to an image:

• ifconfig | convert label:@- ip.png

Easy and fast access to often executed commands that are very long and complex by using labels:

• some_very_long_and_complex_command # label