December 2008
Intermediate to advanced
320 pages
6h 45m
English
Content preview from Expert Shell Scripting
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APPENDIX BSpecial Parameters
Shell special parameters are variables internal to the shell. These variables reference various items, such as the parameters passed to a script or function, process IDs, and return codes. It is not possible to assign a value to them since they can only be referenced.
This appendix is a compilation of the parameters available in bash, ksh, pdksh, and Bourne sh. All of these variables are accessible in each of the shells mentioned, except for $_, which is not available in the Bourne shell.
It isn't necessarily obvious from the shell man pages that you would need to prepend the variables with a $ sign to reference them. For instance, to find the value of the previous command's return code, you would use a command like ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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