nawk[options] ['program'] [files] [variable=value]
New version of awk, with additional capabilities. Nawk is a pattern-matching language useful for manipulating data. See Section 11 for more information on nawk.
fileRead program instructions from file instead of supplying program
instructions on command line.
regexpSeparate fields using regular expression regexp.
variable=valueAssign value to variable before executing 'program'.
If specified at the end of the command line, assignment
occurs after opening files.