How to deal with return codes

Perhaps I miss something easy.

But I could not see how I would deal with return codes > 0, i.e a command I issue returns an error. Example: ~'cat /etc/shadow

[tusharsadhwani]

I could possibly change the syntax of the return btw:

output, stderr_output, return_code = ~'...'

You would be able to get each one of the values by using 1, 2 or 3 values on the left hand side respectively. Does this syntax seem worth adding?

[manfredlotz]

Thanks for your quick answer.I think it would be great to have stdout, stderr and return code which would give maximum flexibility.