Shell

List

Print file tree, including size and modified date

$ tree -DhL 2

-d only directories
-D output last modified date
-h output size (kb)
-L X only descend X levels

Recursively search all files in a folder for a pattern with 'grep'

$ grep -r [pattern]

If you want to limit your scope:

$ grep -r --include=*.js --exclude-dir=node_modules/ [patter]

or use find:

$ find . -iname '*.js' -not -path './node_modules/*'| xargs grep -r console.log

You can use find.

$ find ./ -type f -exec sed -i -e 's/windows/linux/g' {} \;

Piping to xargs instead of -exec if you need more control, but is often OP.

$ find . -name "*.txt" | xargs -0 sed -i '' -e 's/windows/linux/g'

If prefer efficiancy, and only replace in files with containing string, use grep and pipe to xargs

$ grep -rl 'windows' | xargs sed -i 's/windows/linux/g'

$ grep -rl 'console.log' | xargs sed -i '/console.log/d'

Change extension of files:

$ find . -name '*.md' -exec rename .md .txt {} +

With find and sed (oops does not work):

$ find /tmp -iname "*.txt" -exec bash -c 'mv $0 $(echo "$0" | sed -r \"s|\.txt|.cpp|g\")' '{}' \;

To change permissions of all folders in current directory (recursive)

$ find . -type d -exec chmod 777 {} +

To change permission of all folders in current directory (recursive)

$ find . -type d -exec chmod 777 {} +

Full info

$ upower -e
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0

Or if upower is too much bloatware and lower level is demanded, first

$ ls /sys/class/power_supply/BAT0

then, for example

$ cat /sys/class/power_supply/BAT0/status

You will need bc (bench calculator). To get Pi to a precision of 10e-1000:

$ echo "scale=1000; 4*a(1)" | bc -l

List most used commands

Note, you can usually use gawk, awk nor nawk.

$ history | awk '{print $2}' | awk 'BEGIN {FS="|"}{print $1}' | sort | uniq -c | sort -n | tail | sort -nr

$ tail -n+STARTLINE | head -nANTALRADER

+ ska vara med

$ pacmd unload-module module-udev-detect && pacmd load-module module-udev-detect