And I've already expressed my opinion that it is already rather long, where
making it longer is not necessarily making it smarter.
I think if we want to improve the help text, we should split it up.
$ qemu-img --help
qemu-img version 2.12.94 (v3.0.0-rc4-5-g4fe9c3e13d-dirty)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
usage: qemu-img [standard options] command [command options]
QEMU disk image utility
'-h', '--help' display this help and exit
'-V', '--version' output version information and exit
'-T', '--trace' [[enable=]<pattern>][,events=<file>][,file=<file>]
specify tracing options
Commands:
amend Change options of an existing disk image
bench Run benchmarks on a given disk image
check Check the disk image for consistency or repair it
commit Merge the disk image into its backing file
...
Run 'qemu-img <command> --help' for details.
See <https://qemu.org/contribute/report-a-bug> for how to report bugs.
More information on the QEMU project at <https://qemu.org>.