Get list of variables whose name matches a certain pattern

Question

In bash

echo ${!X*}

will print all the names of the variables whose name starts with \'X\'.
Is it possible to get the same with an ar

Answer 1

This should do it:

env | grep ".*X.*"

Edit: sorry, that looks for X in the value too. This version only looks for X in the var name

env | awk -F "=" '{print $1}' | grep ".*X.*"

As Paul points out in the comments, if you're looking for local variables too, env needs to be replaced with set:

set | awk -F "=" '{print $1}' | grep ".*X.*"