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3.2. openstack-config Optional Arguments

--existing[=WHAT]:         For --set, --del and --merge, fail if item is missing,
      where WHAT is 'file', 'section', or 'param', or if
      not specified; all specifed items.
--format=FMT: For --get, select the output FMT.
Formats are sh,ini,lines
--inplace:         Lock and write files in place.
      This is not atomic but has less restrictions
      than the default replacement method.
--list: For --set and --del, update a list (set) of values
--list-sep=STR: Delimit list values with "STR" instead of " ,"
--output=FILE: Write output to FILE instead. '-' means stdout
--verbose: Indicate on stderr if changes were made