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For example, using the grep tool, one can find all three letter words without any vowels, using regular expressions:
cat /usr/share/dict/words | egrep "^[^AEIOUaeiou][^AEIOUaeiou][^AEIOUaeiou]$"The words file is usually stored in /usr/share/dict/words, or /usr/share/words.
A words file is also used to contain words related to a specific topic. One such example of this is for profanity censoring software that replaces profanities, for example, posted on the web with strings such as "###" or some other replacement. Words that are posted in this example are compared with a "bad-words" file and then if there is an occurrence of such a word, it is summarily replaced.