Bash Pocket Reference: Help for Power Users and Sys Admins - download pdf or read online

By Arnold Robbins

ISBN-10: 1491941561

ISBN-13: 9781491941560

It s easy: with a view to have interaction deeply with Mac OS X, Linux, and different Unix-like structures, you must know the way to paintings with the Bash shell. This concise little ebook places all the crucial information regarding Bash correct at your fingertips.

You ll fast locate solutions to the irritating questions that typically arise for those who 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 utilize arrays?

Updated for Bash model 4.4, this e-book has the solutions to those and different difficulties in a layout that makes looking quickly and easy.

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

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

Sample text

CHILD_MAX=n Set the maximum number of child processes for which the shell will remember exit statuses. The maximum is 8192; the minimum is system-dependent. COLUMNS=n Screen’s column width; used in line edit modes and select lists. Defaults to current terminal width. COMPREPLY=(words …) Array variable from which Bash reads the possible completions generated by a completion function. EMACS If the value starts with t, Bash assumes it’s running in an Emacs buffer and disables line editing. ENV=file Name of script that is executed at startup in POSIX mode or when Bash is invoked as /bin/sh; useful for storing alias and function definitions.

COMP_KEY For programmable completion. The key, or final key in a sequence, that caused the invocation of the current completion function. COMP_LINE For programmable completion. The current command line. COMP_POINT For programmable completion. The position of the cursor as a character index in $COMP_LINE. COMP_TYPE For programmable completion. A character describing the type of programmable completion. The character is one of Tab for normal completion, ? for a completions list after two Tabs, ! for the list of alternatives on partial word completion, @ for completions if the word is modified, or % for menu completion.

The Bourne shell allows only nine parameters to be referenced directly (n = 1–9); Bash allows n to be greater than 9 if specified as ${n}. $*, $@ All arguments on the command line ($1 $2 …). "$*" All arguments on the command line as one string ("$1 $2…"). The values are separated by the first character in $IFS. "$@" All arguments on the command line, individually quoted ("$1" "$2" …). 32 | The Bash Shell Bash automatically sets the following additional variables:2 $_ Temporary variable; initialized to the pathname of the script or program being executed.

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Bash Pocket Reference: Help for Power Users and Sys Admins (2nd Edition) by Arnold Robbins


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