Mendel Cooper's Advanced bash-scripting guide PDF

By Mendel Cooper

This can be the total reference at the Borne back shell (bash). quantity 1Volume 2 includes all appendices.

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Additional resources for Advanced bash-scripting guide

Sample text

Terminate a foreground job. ◊ Ctl-D Log out from a shell (similar to exit). EOF (end-of-file). This also terminates input from stdin. When typing text on the console or in an xterm window, Ctl-D erases the character under the cursor. When there are no characters present, Ctl-D logs out of the session, as expected. In an xterm window, this has the effect of closing the window. ◊ Ctl-E Moves cursor to end of line of text (on the command-line). ◊ Ctl-F Moves cursor forward one character position (on the command-line).

You will constantly discover ways of fine-tuning previously written scripts for increased effectiveness. ) [1] at the head of a script tells your system that this file is a set of commands to be fed to the command interpreter indicated. The #! is actually a two-byte [2] magic number, a special marker that designates a file type, or in this case an executable shell script (type man magic for more details on this fascinating topic). Immediately following the sha-bang is a path name. This is the path to the program that interprets the commands in the script, whether it be a shell, a programming language, or a utility.

The ? character serves as a single-character "wild card" for filename expansion in globbing, as well as representing one character in an extended regular expression. $ Variable substitution (contents of a variable). 1 2 3 4 5 var1=5 var2=23skidoo echo $var1 echo $var2 # 5 # 23skidoo A $ prefixing a variable name indicates the value the variable holds. $ end-of-line. In a regular expression, a "$" addresses the end of a line of text. ${} Parameter substitution. $*, $@ positional parameters. $? exit status variable.

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Advanced bash-scripting guide by Mendel Cooper


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