Capturing shell output

General
3

What about:

  • Exit code - only provided at the end. Normally 0 for success, but grep returns 1 if no match, which might or might not be acceptable also.
  • Do you want to stream the output (e.g. piping through gzip), or wait for the definiteness of the exit code first?
  • STDERR output, if any (rather than just STDOUT)
  • For completeness - might want to be piping via STDIN to e.g. gzip

I gave some basic predicates at How to get shell echo in Prolog variables - #15 by brebs

Haven’t looked at it since. This could do with a standard library, sure.