How to use an environment variable inside a quoted string in Bash

Question

I\'ve tried various forms of the following in a bash script:

#!/bin/bash
svn diff $@ --diff-cmd /usr/bin/diff -x \"-y -w -p -W $COLUMNS\"

B

Answer 1

If unsure, you might use the 'cols' request on the terminal, and forget COLUMNS:

COLS=$(tput cols)