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- diff
- compares two files and prints lines that are different
- file
- tries to determine type of file
- grep
- looks for pattern and prints file lines containing pattern
- sort
- sorts lines of file and puts them in alphabetical order
- spell
- checks file for spelling errors and prints misspelled words
- ispell
- an interactive spell-checker
- du
- displays the disk usage for the current working directory
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