To store the output of a command as a variable in sh/ksh/bash, you can do either
var=$(command)
or
var=`command`
What's the difference if any between the two methods?
Bash – the difference between $(command) and `command` in shell programming
bashkshshshell
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Best Answer
The backticks/gravemarks have been deprecated in favor of
$()for command substitution because$()can easily nest within itself as in$(echo foo$(echo bar)). There are other differences such as how backslashes are parsed in the backtick/gravemark version, etc.See BashFAQ/082 for several reasons to always prefer the $(...) syntax.
Also see the POSIX spec for detailed information on the various differences.