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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 ...}}