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‫Of course, there are many utilities available in Linux and Unix systems that allow you to process and

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‫filter text files.

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‫Cut is a command line utility that allows you to cut parts of lines from specified files or piped data,

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‫and print the result to standard output so it can be used to cut parts of a line by delimiter, byte

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‫position and character.

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‫Dash RF is the parameter used to select only specified fields with a dash parameter D limiters used

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‫to cut data.

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‫So let's see how it works.

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‫Go to Kelly and the most common file to understand the usage of the cut command, I think, is slash

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‫ETSI slash password.

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‫So let's view the contents of this file again.

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‫As you can see, each data is separated by a colon, so that means that we can use the colon as a delimiter.

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‫Let's get the first fields of each line with the Dash F1 parameter.

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‫OK, so this error is caused by the slash, because password is a file, not a directory, so don't

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‫use a slash at the end of the file.

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‫Now, let's delete it and run the command again.

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‫OK.

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‫See how that works.

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‫We get the first fields of each row.

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‫So let's change the field numbers.

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‫You can select multiple fields just using a comma.

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‫And sure enough, we'll get the third and fourth fields of each row in the file.

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‫The first numbers are user IDs.

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‫The second numbers are the group IDs of the users.