Include only local subsections into TOC. This prevent duplication of
TOC when build single page HTML document. Also this make unnecessary CSS hack
to hide document title as top level section.
.. -*- coding: utf-8; -*-
.. include:: HEADER.rst
=======
POSIX
=======
.. contents::
:local:
Download POSIX
==============
http://www.opengroup.org/onlinepubs/009695399/download
download page for SYSV3
http://www.opengroup.org/onlinepubs/9699919799/download
download page for SYSV4
Shell command
=============
command
-------
Main semantic is to invoke command instead defined function with same name::
$ ls() { ls --color "$@"; }
$ ls # infinitely loop as func invoke itself
$ ls() { command ls --color "$@"; }
$ ls . # invoke /bin/ls with color output
$ unset ls # forget func definition
$ ls # invoke /bin/ls without color output
With '-p' arg Perform the command search using a default value for PATH that
is guaranteed to find all of the standard utilities::
$ command -p getconf PATH
With '-v' arg work like 'which' command which not included in POSIX::
$ command -v ls
/usr/bin/ls
$ command -v echo # for build-in command print command itself
echo # you can check for equality or for slash to
# distinguish from utilities