The comm command is one of the standard command-line text-processing tools included with nearly all versions of Linux and UNIX (including AIX). The comm command is a powerful tool that compares the contents of two files and shows lines common to both files (hence the command's name) as well as content unique to each file. For example, if you have two large text files containing similar lists, you can use comm to show the lines that are unique to the first file, the lines unique to the ...

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