Unix commands are executable binary files located in directories with the name bin (for binary). Many of the commands that you use are located in the directory /usr/bin.
When you enter the name of a command the shell checks to see if it is a built-in command. If it is not, it looks for the the binary file that the command name refers to in each of the directories that are defined in the PATH environment variable.
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Created 1996-2023 by Maxim Chirkov
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