bash Pocket Reference by Arnold Robbins PDF

By Arnold Robbins

ISBN-10: 1449387888

ISBN-13: 9781449387884

It's basic: you must know the way to paintings with the bash shell with a purpose to get to the guts of Mac OS X, Linux, and different Unix structures. up-to-date for the latest model of bash, this concise little booklet places the entire crucial information regarding bash at your fingertips. You'll fast locate solutions to tense questions that usually arise whilst 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? -- and masses extra.

If you're a consumer or programmer of any Unix variation, or if you're utilizing bash on home windows, you'll locate this pocket reference essential. This ebook covers:
* Invoking the Shell
* Syntax
* features
* Variables
* mathematics Expressions
* Command background
* Programmable final touch
* activity keep watch over
* Shell ideas
* Command Execution
* Coprocesses
* limited Shells
* integrated instructions

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Similarly, var can be an array indexed by * or @. 22 | The Bash Shell ${var/pat/repl} Use value of var, with first match of pat replaced with repl. ${var/pat} Use value of var, with first match of pat deleted. ${var//pat/repl} Use value of var, with every match of pat replaced with repl. ${var/#pat/repl} Use value of var, with match of pat replaced with repl. Match must occur at beginning of the value. ${var/%pat/repl} Use value of var, with match of pat replaced with repl. Match must occur at end of the value.

Q Quote a word list. :x Quote separate words. The truncation modifiers are shown in the following table. Modifier Description :r Extract the first available pathname root (the portion before the last period). :e Extract the first available pathname extension (the portion after the last period). :h Extract the first available pathname header (the portion before the last slash). :t Extract the first available pathname tail (the portion after the last slash). Programmable Completion Bash and the readline library provide completion facilities, whereby you can type part of a command name, hit the Tab key, and Bash will fill in part or all of the rest of the command Programmable Completion | 41 or filename.

Who | grep jane > /dev/null then echo jane is not currently logged on fi # Introduce a comment that runs to the end of the line. # text … Ignore all text that follows on the same line. # is used in shell scripts as the comment character and is not really a command. shell Invoke the named interpreter to execute the script. shell [option] Used as the first line of a script to invoke the named shell. Anything given on the rest of the line is passed as a single argument to the named shell. This feature is typically implemented by the kernel, but may not be supported on some very old systems.

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bash Pocket Reference by Arnold Robbins

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