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To find out what version of indent you have, use the command
indent -version. This will report the version number of
indent, without doing any of the normal processing.
The `-v' option can be used to turn on verbose mode. When in
verbose mode, indent reports when it splits one line of input
into two more more lines of output, and gives some size statistics at
completion.
The `-pmt' option causes indent to preserve the access
and modification times on the output files. Using this option
has the advantage that running indent on all source and header
files in a project won't cause make to rebuild all targets.
This option is only available on Operating Systems that have the
POSIX utime(2) function.