Common Utilities

• chmod - change the permissions on a file
• cmp - compare sorted files
• diff - difference between two files
• df - disk space free
• du - disk space used
• head, tail – print the first or last lines of a file
• make - run the commands in a “Makefile”
• pushd, popd, dirs – keep a stack of “current” directories
• sort - sort a file
• tr - translate characters
• uniq - remove duplicates
• unmask - change / print the user file-creation mask
• write - send a message to another user

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