:sig
String shell_escape(String raw)

:params
raw : string that should be escaped
return value : escaped version of 'raw'

:see
>sys

:content
Escapes a parameter so it can be used more safely with `shell_exec()`.

This is the helper to reach for when building shell command lines from dynamic input.

:example
print(shell_escape("rm -rf /; echo pwned"), "\n");
