chronic

Display stdout and stderr of a command if and only if it fails. More information: https://joeyh.name/code/moreutils/.

• Display stdout and stderr of the specified command if and only if it produces a non-zero exit code or crashes:

chronic command options …

• Display stdout and stderr of the specified command if and only if it produces a non-empty stderr:

chronic -e command options …

• Enable [v]erbose mode:

chronic -v command options …