The $ character is used for parameter expansion, and command substitution. You can use it for manipulating and/or expanding variables on demands without using external commands such as sed or awk.
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command line arguments
Paul has responded to MCSE mike. Checkout my stand on Linux admin vs Microsoft Windows admin.
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From my mail bag:
I would like to run few commands such as stop or start web server as a root user. How do I allow a normal user to run these commands as root?
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You would like to execute a command on a remote Linux/FreeBSD/Solaris/UNIX host and have the result displayed locally. Once result obtained it can be used by local script or program. A few examples: => File system and disk information => Get user information => Find out all running process => Find out if particular service [...]
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