How do i use bash command substitution?

hawksbill

There are two ways to use command substitution in bash. One is using back ticks and the other is using $()

For back ticks, a single for loop is a good example. This lists the contents of dir

This expands the $PWD variable to the value of the variable.

Effectively like doing:

for i in `ls /home/myuser`

for i in `ls $PWD`
do
echo $i
done

Using the $() notation for substitution. This will run the groups command and substitute the output in the for loop.

Effectively like doing:

for i in adm users samba devgrp

for i in $(groups)
do
echo $i
done