grep procedure

grep Procedure

Search a named file for lines that contain a match for a regular expression. The result is a list of all the lines that match. If no lines match, the result is an empty string. All of the Tcl regular expression syntax is supported.

grep -n filename regexp line

-n

The -n option prefixes matched lines in the result with the line number, just like GNU grep does. This option should be used in preference to the line keyword documented below.

filename

The file to search.

regexp

The Unix style regular expression (as used by the grep UNIX utility) to search for.

line

Use the optional keyword line to prefix matched lines in the result with the line number. This usage is deprecated.