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In how many categories, commands of UNIX operating system classified?

In how many categories, commands of UNIX operating system classified? Correct Answer 2

There are two broad categories in which the classification of commands is based on UNIX. They are namely—external commands and internal commands. External commands are those commands that have an independent existence in the /bin directory i.e. these are the executables which are present in separate files while Internal commands are built-in commands which are built into the shell. Example, ‘ls’ is an external command while ‘echo’ is an internal command.

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