By Arnold Robbins

It's uncomplicated: you want to know the way to paintings with the bash shell that will get to the center of Mac OS X, Linux, and different Unix structures. up-to-date for the newest model of bash, this concise little booklet places the entire crucial information regarding bash at your fingertips. You'll fast locate solutions to demanding 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 have? 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 quintessential. This booklet covers:
* Invoking the Shell
* Syntax
* services
* Variables
* mathematics Expressions
* Command historical past
* Programmable final touch
* task keep an eye on
* Shell concepts
* Command Execution
* Coprocesses
* constrained Shells
* integrated instructions

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Additional info for bash Pocket Reference

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If a compspec exists, Bash uses it. If not, Bash uses the “default” compspec given with complete -D. If there is none, then Bash falls back to the default built-in completions. 4. Bash performs the action indicated by the compspec to generate a list of possible matches. Of this list, only those that have the word being completed as a prefix are used for the list of possible completions. For the -d and -f options, the variable FIGNORE is used to filter out undesirable matches. 5. Bash generates filenames as specified by the -G option.

Bash has no limit on the number of elements. Arrays are initialized with a special form of assignment: message=(hi there how are you today) Variables | 33 where the specified values become elements of the array. Individual elements may also be assigned to: This is the hard way message[0]=hi message[1]=there message[2]=how message[3]=are message[4]=you message[5]=today Declaring indexed arrays is not required. Any valid reference to a subscripted variable can create an array. When referencing arrays, use the ${ … } syntax.

Name[*]} Use the number of elements in array name. ${#name[@]} Same as previous. Associative arrays Bash provides associative arrays, where the indices are strings instead of numbers (as in awk). In this case, [ and ] act like double quotes. Associative arrays must be declared by using the -A option to the declare, local, and readonly commands. A special syntax allows assigning to multiple elements at once: data=([joe]=30 [mary]=25) message=([0]=hi [2]=there) Associative array assignment Indexed array assignment works, too The values would be retrieved as ${data[joe]} and ${data[mary]}.

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