Question

I need to write multiple sed script files. I can’t seem to find a way to enable extended regex from within the script. Is this possible? It isn’t possible for me to use option flags because the scripts need to run on an external environment which isn’t under my control.

Answer 1

You can try specifying the flag in the script shebang, say:

#!/bin/sed -rf
# script goes here

And then tell the admin to run the script as is (chmod a+x it first, then ./script.sed) so the shebang line is used for finding the right interpreter.

You may need to substitute /bin/sed with the right path for your environment. Unfortunately you probably won’t be able to use /usr/bin/env sed -r for this (the extra -r is a problem).