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This short tutorial will get you started writing shell scripts in a hurry. It is written for the Bourne again shell (bash) but generally applies to sh, ksh, and zsh as well, among others.
If you can run programs from the command line and you can use an editor, you should have no trouble programming in shell scripts.
The shell expands a string containing a * to all filenames that "match". A filename matches if and only if it is identical to the match string after replacing the stars * with arbitrary strings. For example, the character "*" by itself expands to a space seperated list of all files in the working directory (excluding those that start with a dot ".") (and now for some stars canvas prints)
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