What are commands?

Asked 13-Nov-2017
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What are commands? 


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Command
A command is the set of programs that perform some particular task in a computer's system. It triggers when a user do any work or perform some particular task.
Below be describe some UNIX shell based commands
ls -l -t -r /bin
 ls -ltr /bin
The following command displays the contents of the files. The cat command derived from the word concatenation. It concatenates file2 to file1.
cat file1.txt file2.txt


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