Although the command line makes Unix über powerful, it is really the subtleties of things such as wildcard characters where the true power lies. Here are two: * and ?
The asterisk, *, matches zero or more characters. For example, a* matches the files a , ab , abc , abc.d
The question mark, ?, matches exactly one character. For example, a? matches aa , ab , ac , etc.
For example, to find all the files ending in .sh in the current directory, using the find command:
find . -name '*.sh'
To list all files that begin with “f1”, but have any value for the third position using the ?:
Or, you can combine the two:
find . -name '7_1?0.*'
In this example find will find all files that begin with “7_1”, have any character for the 4th term, have “0.” for the next two terms, and any terminating characters (either in type or length).