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bash Pocket Reference
book

bash Pocket Reference

by Arnold Robbins
May 2010
Beginner to intermediate content levelBeginner to intermediate
130 pages
3h 20m
English
O'Reilly Media, Inc.
Content preview from bash Pocket Reference

Invoking the Shell

The command interpreter for the Bash shell (bash) can be invoked as follows:

bash  [options]  [arguments]

Bash can execute commands from a terminal, from a file (when the first argument is a script), or from standard input (if no arguments remain or if -s is specified). The shell automatically prints prompts if standard input is a terminal, or if -i is given on the command line.

On many systems, /bin/sh is a link to Bash. When invoked as sh, Bash acts more like the traditional Bourne shell: login shells read /etc/profile and ~/.profile, and regular shells read $ENV, if it is set. Full details are available in the bash(1) manpage.

Options

-c str

Read commands from string str.

-D, --dump-strings

Print all $"…" strings in the program.

-i

Create an interactive shell (prompt for input).

-l, --login

Shell is a login shell.

-O option

Enable shopt option option. Use +O to unset option.

-p

Start up as a privileged user. Do not read $ENV or $BASH_ENV; do not import functions from the environment; and ignore the values of the BASHOPTS, CDPATH, GLOBIGNORE, and SHELLOPTS variables. The normal fixed-name startup files (such as $HOME/.bash_profile) are read.

-r, --restricted

Create a restricted shell.

-s

Read commands from standard input. Output from built-in commands goes to file descriptor 1; all other shell output goes to file descriptor 2.

--debugger

Read the debugging profile at startup and turn on the extdebug option to shopt. For use by the Bash debugger (see http://bashdb.sourceforge.net). ...

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Publisher Resources

ISBN: 9781449388669Errata Page