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

By Arnold Robbins

It s basic: on the way to have interaction deeply with Mac OS X, Linux, and different Unix-like structures, you want to know the way to paintings with the Bash shell. This concise little e-book places all the crucial information regarding Bash correct at your fingertips.

You ll quick locate solutions to the aggravating questions that in general arise in the event 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 utilize arrays?

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

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

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

Sample text

With a value of substring, it can match a substring of the command name. Variables | 43 histchars=chars Two or three characters that control Bash’s csh-style history expansion. The first character signals a history event, the second is the “quick substitution” character, and the third indicates the start of a comment. ^#. See the section “C-Shell– Style History” on page 51. Arrays Bash provides two kinds of arrays: indexed arrays, where the indices are integers zero and above, and associative arrays, where the indices are strings.

T The current time in 24-hour HH:MM:SS format. \T The current time in 12-hour HH:MM:SS format. \u The current user’s username. \v The version of Bash. \V The release (version plus patchlevel) of Bash. \w The current directory, with $HOME abbreviated as ~. See also the description of the PROMPT_DIRTRIM variable. \W The basename of the current directory, with $HOME abbreviated as ~. See also the description of the PROMPT_DIRTRIM variable. \! The history number of this command (stored in the history).

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. COMP_WORDBREAKS For programmable completion. The characters that the readline library treats as word separators when doing word completion.

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