grep.info: Command-line Options

Invoking

Environment Variables

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2.1 Command-line Options
========================

`grep' comes with a rich set of options: some from POSIX and some being
GNU extensions.  Long option names are always a GNU extension, even for
options that are from POSIX specifications.  Options that are specified
by POSIX, under their short names, are explicitly marked as such to
facilitate POSIX-portable programming.  A few option names are provided
for compatibility with older or more exotic implementations.

Generic Program Information

Matching Control

General Output Control

Output Line Prefix Control

Context Line Control

File and Directory Selection

Other Options

   Several additional options control which variant of the `grep'
matching engine is used.  Note: grep Programs.