Unix

Bash Pocket Reference: Help for Power Users and Sys Admins by Arnold Robbins

By Arnold Robbins

It s easy: in order to have interaction deeply with Mac OS X, Linux, and different Unix-like structures, you want to understand how to paintings with the Bash shell. This concise little e-book places the entire crucial information regarding Bash correct at your fingertips.

You ll quick locate solutions to the irritating questions that more often than not arise should you re writing shell scripts: What characters do you want to cite? How do you get variable substitution to do just what you will want? How do you employ arrays?

Updated for Bash model 4.4, this ebook has the solutions to those and different difficulties in a structure that makes searching speedy and easy.

Topics comprise:
• Invoking the shell
• Syntax
• services and variables
• mathematics expressions
• Command history
• Programmable completion
• task control
• Shell options
• Command execution
• Coprocesses
• constrained shells
• integrated commands"

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Additional info for Bash Pocket Reference: Help for Power Users and Sys Admins (2nd Edition)

Sample text

56 | The Bash Shell 12. Normally, when a compspec is provided, Bash’s default completions are not attempted, nor are the readline library’s default filename completions. However: a. If the compspec produces no results and -o bashdefault was provided, then Bash attempts its default completions. b. If neither the compspec nor the Bash default comple‐ tions with -o bashdefault produced any results, and -o default was provided, then Bash has the readline library attempt its filename completions. A compspec may be modified with the compopt command.

Matching lines are not saved in the history file. An unescaped & in a pattern matches the previous history line. The value of the extglob shell option is honored. HISTSIZE=n Number of history commands to be kept in the history list. If zero, no commands are stored. If negative or nonnumeric, there is no limit. Default is 500. HISTTIMEFORMAT=string A format string for strftime(3) to use for printing timestamps along with commands from the history command. If set (even if null), Bash saves timestamps in the history file along with the commands.

For more information, see the section “Coprocesses” on page 68. DIRSTACK Array variable, containing the contents of the directory stack as displayed by dirs. Changing existing elements modifies the stack, but only pushd and popd can add or remove elements from the stack. EUID Read-only variable with the numeric effective UID of the current user. FUNCNAME Array variable, containing function names. Each element corresponds to those in BASH_SOURCE and BASH_LINENO. FUNCNEST A value greater than zero defines the maximum function call nesting level.

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