The /usr/bin/awk utility scans each input filename for lines that match any of a set of patterns specified in prog. The prog string must be enclosed in single quotes (') to protect it from the shell. For each pattern in prog there may be an associated action performed when a line of a filename matches the pattern. The set of pattern-action statements may appear literally as prog or in a file specified with the -f progfile option. Input files are read in order; if there are no files, the standard input is read. The file name '-' means the standard input | - 1 - - 2 - - 3
