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For long options, print: * the option as specified by the user if it's unknown * the canonical long option if its argument is not a number (and should be) And for missing arguments, print both the short and the long option name. (Doing only one of those would require either parsing argv ourselves or let getopt print the errors, since we can't tell long and short options apart by optopt or longindex) https://bugzilla.redhat.com/show_bug.cgi?id=949373 Unsupported long option: $ virsh --pm Before: error: unsupported option '- After: error: unsupported option '--pm'. See --help. Missing parameter: $ virsh --deb Before: error: option '-d' requires an argument After: error: option '-d'/'--debug' requires an argument $ virsh -rd Before: error: option '-d' requires an argument After: error: option '-d'/'--debug' requires an argument Non-numeric parameter: $ virsh --deb duck Before: error: option -d takes a numeric argument After: error: option --debug takes a numeric argument
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>