January 2004
Intermediate to advanced
432 pages
7h 49m
English
Content preview from Linux Shell Scripting with BashBecome 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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Chapter 9. Parameters and Subshells
To serve as a flexible tool, a script has to be qualified when it is called, given additional information about how and where to perform its task. Like commands, a script is qualified using parameters. Switches and arguments make a script reusable, which in turn reduces costs and time.
Positional Parameters
There are three methods available to extend Linux scripts using parameters. The first method uses positional parameters. A script can refer to the parameters on the command line by the position (or order) in which they appear. Because the other two methods rely on positional parameters, they are discussed first.
The Bash variable $0 is the pathname of the script. It is not necessarily the full pathname, but ...
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