I'm trying to make a command to do a perl substitution on a batch of php files in a directory. The string I want to replace has single quotes in it, and I can't get it to properly escape the in shell.

I tried echoing the string with unescaped quotes, to see what perl would be getting: echo 's/require_once('include.constants.php');/require_once('include.constants.php');require_once("./functions/include.session.inc.php");/g'

and it doesn't have the single-quotes in the result:

s/require_once\(include.constants.php\);/require_once\(include.constants.php\);require_once\("\./functions/include\.session\.inc\.php"\);/g

However, when I try to escape the single quotes:

echo 's/require_once\(\'include\.constants\.php\'\);/require_once\(\'include\.constants\.php\'\);require_once\("\./functions/include\.session\.inc\.php"\);/g'

I get the prompt to complete the command:

>

What I want it to parse to is this:

What am I doing wrong?

s/require_once\('include.constants.php'\);/require_once\('include.constants.php'\);require_once\("\./functions/include\.session\.inc\.php"\);/g