UNIX isn’t alone in being persnickety about creating and finding filenames and pathnames. Keep the following tips in mind as you create and search through UNIX files:
Capital and small letters are different in filenames.
Filenames can contain letters, numbers, periods, and underscores (_). Stay away from other punctuation. Slashes are special (see below).
Filenames shouldn’t contain spaces.
The ? wildcard stands for a single character in a filename. The * wildcard stands for a bunch of characters in a filename. An * by itself stands for all files in the working directory.
A pathname is the path in which you (or UNIX) can find a file or directory. The root (main) directory of the disk is called /.
A pathname consists of directory names separated by slashes (/). If a pathname starts with a slash (/), it begins at the root directory. If a pathname doesn’t start with a slash, it begins at the working directory.
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Source:http://www.dummies.com/how-to/content/unix-filenames-and-pathnames.html
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