startup: Optionally run (and exit with) a command
Treat the first non-option as a command, and any others as its CLI arguments. Run the command with those arguments; communicate its exit status (if nonzero); and exit with it. Document this added functionality in the manpage and usage description. Closes: https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1981 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1982>
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MUTTER \- Clutter based compositing GTK2 Window Manager
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.SH SYNOPSIS
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.B mutter
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[\-\-display=\fIDISPLAY\fP] [\-\-replace] [\-\-sm\-client\-id=\fIID\fP] [\-\-sm\-disable] [\-\-sm\-save\-file=\fIFILENAME\fP] [\-\-version] [\-\-help]
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[\-\-display=\fIDISPLAY\fP] [\-\-replace] [\-\-sm\-client\-id=\fIID\fP] [\-\-sm\-disable] [\-\-sm\-save\-file=\fIFILENAME\fP] [\-\-version] [\-\-help] [[\-\-] command [argument...]]
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.SH DESCRIPTION
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This manual page documents briefly
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.B mutter\fP.
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