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What does the echo command do?

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What does the echo command do?

(a) It echoes

(b) It shows the comments present in Script files

(c) It shows the commands and comments in MAT-files

(d) It shows the commands and the comments in M-files

I have been asked this question in an online interview.

Query is from M-Files in division Interacting with MATLAB of MATLAB

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The correct option is (d) It shows the commands and the comments in M-files

For explanation: The echo command is a pre-defined function in MATLAB. If it is present in an m-file, the command will help to show the commands and comments present in the m-file when the m-file is called in the command window.

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