[NTLUG:Discuss] Catching exit code in a pipe?

[David Stanaway]

I have a backup script that includes:

su -c "pg_dumpall | gzip -9 > backup/db.out.gz" -l postgres


$? gets the most recent pipelined command exit, and catches the gzip
exit code which is always 0.

I don't want to create an intermediate file uncompressed.

Does anyone have an idea how I can do this in bash without getting too
creative with subshells and signal handlers?