Grep Lesson 1 (basic)

Man grep

Grep searches the named input files (or standard input if no files are named, or if a single hyphen-minus (-) is given as file name) for lines containing a match to the given pattern. by default, grep prints thematching lines.

In addition, three variant programs egrep, fgrep and rgrep areavailable. egrep is the same as grep-e. fgrep is the same asgrep-f. rgrep is the same as grep-R. direct invocation as either egrep or fgrep is deprecated, but is provided to allow historical applications that rely on them to run unmodified.

Examples: ifconfig | grep-I packets

Grep Lesson 1 (basic)