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This is the "input file to search for defs" option.
This option has some usage constraints. It:
All files that are to be searched for definitions must be named on
the command line or read from
stdin. If there is only one
input option and it is the string, "-", then the input file
list is read from
stdin. If a command line argument is not
an option name and does not contain an assignment operator
=), then it defaults to being an input file name.
At least one input file must be specified.