3)cat : This Command can Read, Modify or Concatenate text files. This Command is mostly used for Displaying the Contents of a File.
12)echo : This Command allows a User to Repeat, a string variable to standard output.
16)less :This Command is used to Scroll through Configuration and Error Log Files, Displaying text files on screen at a time, with Backward or Forward moving Available in files.
31)top : TOP is a set of Protocols for Networks that performs Distributed Information Processing and displays the Tasks on the system that take up the Most Memory.
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