It might be better to output version and help to stdout

[lonnywong]

Related to Homebrew/homebrew-core#181568.

[kke]

Yes.

Stdout = Information that user requested, interactive elements, payload
Stderr = Diagnostics, logging, errors, stuff you don't want to include when capturing/redirecting payload

Things like foo --help | less, foo --help | grep -i color and foo --version | grep -q v1.20. should work without redirecting stderr to stdout.

[lonnywong]

The openssh client outputs version and help message to stderr.

/usr/bin/ssh 1>/tmp/ssh.stdout 2>/tmp/ssh.stderr

/usr/bin/ssh -V 1>/tmp/ssh.stdout 2>/tmp/ssh.stderr

/usr/bin/ssh -h 1>/tmp/ssh.stdout 2>/tmp/ssh.stderr

The output goes to /tmp/ssh.stderr, but not /tmp/ssh.stdout.