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Rob N
3af63683fe
'program help subcommand' is a reasonably common pattern for multifunction command-line programs. This commit adds support for that style to the zpool and zfs commands. When run as 'zpool help [<topic>]' or 'zfs help [<topic>]', executes the 'man' program on the PATH with the most likely manpage name for the requested topic: "zpool-<topic>" or "zfs-<topic>" for subcommands, or "zpool<topic>" or "zfs<topic>" for the "concepts" and "props" topics. If no topic is supplied, uses the top "zpool" or "zfs" pages. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Kay Pedersen <mail@mkwg.de> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #15288