November 2013
Beginner
900 pages
56h 6m
English
book
Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition
by Matthew Helmke, Andrew Hudson, Paul Hudson
Content preview from Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using Single Quotes to Maintain Unexpanded Variables
You can surround a string with single quotes (’) to stop the shell from expanding variables and interpreting special characters. When used for the latter purpose, the single quote is an escape character, similar to the backslash, which you learn about in the next section. Here, you learn how to use the single quote to avoid expanding a variable in a shell script. An unexpanded variable maintains its original form in the output.
In the following examples, the double quotes in the preceding examples have been changed to single quotes:
pdksh and bash:var='test string'newvar='Value of var is $var'echo $newvartcsh:set var = 'test string'set newvar = 'Value of var is ...
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