Help (shell)

help

Command line
Force argument:			interface=${1:? "usage"}
Resize gnome-terminal:		resize -s 50 140
Find file with wildcard:	find . -name 'test*'
Untar --extract --file:		tar xf archive.x.y.z -C directory
Unzip to directory:		unzip archive.zip -d directory
Zip directory:			zip archive.zip -r directory
Inline sed:			sed -i '/Term/s/^/#/'
Process substitution:		meld <(xxd file1) <(xxd file2) <(xxd file3)
Make Android screenshot:	adb shell screencap -p | dos2unix > screen.png
Restart unity panel:		killall unity-panel-service
File exists?			[ -e "$file" ] && echo "present" || echo "absent"
Var set?			[ -n ${var+x} ] && echo "set" || echo "unset"
Var set and non-empty?		[ -n "${var}" ] && echo "set and non-empty" || echo "unset or empty"
Var not set?			[ -z ${var+x} ] && echo "unset" || echo "set"
Var not set or empty?		[! -n "${var}" ] && echo "unset or empty" || echo "set and non-empty"
Var set only if not set		var=${var:-default}
Var equal to value (sh)		if [ "$var" = "value" ]; then
Extract path			${VAR%/*}
Extract file			${VAR##*/}
Extract file without ext	${VAR%%.*}
Extract file without one ext	${VAR%.*}
Extract extension (.gz)		${VAR##*.}
Extract extension (.tar.gz)	${VAR#*.}
Unix time to date:		date --date='@1425908833.293774'
Time date time msec		date '+%Y%m%d_%H%M%S_%3N'
Module param values:		sudo grep '' /sys/module/i915/parameters/*
Prettify json:			< file.json python -m json.tool > pretty.json
Prettify json:			< file.json jq .
Get json field 'results':	< file.json jq '.results'
Get json array:			< file.json jq '.results[]'
Build json struct:		< file.json jq '.results[] | {address: .address, city: .city}'
Select based on subfield	< file.json jq '.[] | select(.field == "text")'
List gsettings values:		gsettings range org.gnome.settings-daemon.plugins.power critical-battery-action
List gsettings keys:		gsettings list-recursively org.gnome.settings-daemon.plugins.power
Deep rsync:			rsync -avzul --copy-links src dest
Find .deb package:		dpkg -S /some/file
Sed substitution		sed 's/test=\(.*\)/test=\1/g'
Cat including filename		tail -n +1 directory/*
Copy completions (zsh)		compdef cmd1=cmd2
Get column 2 and 3		csvtool col 2-3 input.csv
Sum col 12			cat input.csv | csvtool drop 1 - | csvtool col 12 - | paste -s -d+ - | bc
Find files & print full path	find . -type f -name "*.mp4" -exec readlink -f {} \;
Find process using port		sudo ss -lptn 'sport = :8200'
Find TCP ports in use		ss -t -a
Open last screenshot		gimp ~/pictures/*(.om[1])
List packages on size		dpkg-query -W -f='${Installed-Size;8}\t${Package}\t${status}\n' | grep -v 'deinstall' | cut -f1-2 | sort -n
Remove newlines \nmatch		sed ':r;$!{N;br};s/\nmatch//g'
Clean up hcidump		sudo hcidump -x -R -t | sed 's/  /\n/g' | awk 'BEGIN{RS="\n\n" ; ORS="";}{ print }'
Remove empty lines		| grep .
Sum numbers per line		| paste -s -d+ - | bc
Drop last line			sed '$ d'
Drop last line			head -n -1
Sum values in column		cat numbers.txt | jq -s 'add'
Get Google Drive pdf		getpdf file.gddoc
Use ctags for C++		ctags --c++-kinds=+p --fields=+iaS --extra=+q --language-force=c++ -R .
Specify ctags .h and .c files	find . \( -name "*.h" -or -name "*.c" \) -exec ctags {} +

git
Subtree push:			git subtree push --prefix docs/html upstream gh-pages
Revert single file:		git checkout -- src/file.cpp
Unstage single file:		git reset src/file.cpp
Diff file:			git diff HEAD^^..HEAD src/file.cpp
Get folder from branch:		git checkout master; git checkout branch folder

over files
Find and grep			find . -name "*.cpp" -exec grep ENCYR {} \;
Find and sed			find . -name "*.cpp" -exec sed -i 's/ENCYR/ENCRY/g' {} \;

convert
Resize image:			convert input_file -resize 100x100 output_file
Convert *.png -> *.jpg		for f in *.png; convert $f -resize 375x667 "${f%.*}.jpg"
Convert to color		for f in *.png; convert $f -fuzz 40% -fill "#007cc3" -opaque black ../blue/$f
Convert to particular size	convert -define jpeg:extent=500kb input_file output_file
Convert transparent (order!)	convert -background none img.svg img.png
Create movie			ffmpeg -f image2 -r 6 -pattern_type glob -i "*.png" output.mp4 -pix_fmt yuv420p
Create gif			ffmpeg -ss 0:50 -i input.mkv -t 30 -s 480x270 result.gif -hide_banner
Crop 50px from left and right	convert ifile -shave 50x0+50+0 +repage ofile
Crop bottom 50px		convert ifile -gravity South -chop 0x50 ofile
Crop 640x480 with offset	convert ifile -crop 640x480+50+100 ofile
List DPI			identify -format %x,%yn -units PixelsPerInch ifile
Crop circularly step 1		convert -size 200x200 xc:Black -fill White -draw 'circle 100 100 100 1' -alpha Copy mask.png
Crop circularly step 2		convert ifile -gravity Center mask.png -compose CopyOpacity -composite -trim ofile
Add color to both sides		convert ifile -background '#003e52' -gravity center -extent 3200x1800 ofile

pdf
Reverse order pdf		pdftk ifile cat end-1 output ofile
Merge odd and even pdf		pdftk A=fileA B=fileB shuffle A B output ofile
View pdf			zathura ifile
Revert colors of pdf		zathura: Ctrl+r

vim
Change case			~
Record macro, example		qa~wq	@a
Count words			select block; g Ctrl+g
Replace word			:%s/\<foo\>/bar/g
Toggle header-source file	:FSHere
Toggle header-source file	:tag header (Ctrl+t to go back)
Open file			:find cs_Error.h
Go to class			:tag ADC
Go to definition		Ctrl+]
Go back				Ctrl+T (or :pop)
Show all tags			g]
From "x" to <x>			s/"\([^"].*\)./<\1>/g
Remove trailing whitespace	s/[ \t]*$//g
Sort and make unique		:sort u
Enhance list			s/.*/case &:\rreturn "&";/g
Show matched lines:		g/match/
Remove matched lines:		g/match/d
Copy to system clipboard	:'<,'>w !cb'
Add character ë or â		Ctrl+K e: or Ctrl+K a^
Html URL to markdown		:%s/<a href="\(.*\)">\(.*\)<\/a>/[\2](\1)/
Html h1 to markdown		:%s/<h1>\(.*\)<\/h1>/# \1/g
Html h2 to markdown		:%s/<h2>\(.*\)<\/h2>/## \1/g
Where is an option set?		:verbose set tabstop?
How to remove ^M?		:%s/<Ctrl-V><Ctrl-M>//g (so first type Ctrl-V for ^ sign)
Update vim plugins		vim +PluginInstall +qall
Remove vim plugins		vim +PluginClean +qall

gam
Update gam			bash <(curl -s -S -L https://git.io/install-gam) -l
Remove spam filter		gam update group [email protected] spam_moderation_level allow
Add user to group		gam update group [email protected] add member user [email protected]

netrw (vim file explorer)
Create new file			%

i3
Exit/quit session		Meta+Shift+e
Lock screen			Meta+Alt+l

X
Disable power down		/usr/share/X11/xkb/symbols/inet change POWR

zsh
Tail last file			tail *(.om[1])

tmuxp
Go to window on the left	Ctrl+B <-
Increase width to the right	Ctrl+B Ctrl+->

css
Add padding			padding top right bottom left [px] (clockwise starting with top)

nmcli
Turn on wifi			nmcli r wifi on
List all wifi networks		nmcli c
Scan for networks		nmcli d wifi rescan
List wifi networks		nmcli d wifi list
Connect with network		nmcli d wifi connect 'Wifi network' [password]

print
Print label			lpr -o landscape -o fit-to-page -P Zebra_Technologies_ZTC_GK420d file

hardware
Set brightness			echo 70 | sudo tee /sys/class/backlight/intel_backlight/brightness