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cp is the command entered in a Unix shell to copy a file from one place on a computer to another place on the same filesystem. The original file remains unchanged, and the new file may have the same or a different name. Since Unix does not rely on file extensions as, e.g. Microsoft Windows does to identify file format, it is perfectly reasonable to change the extension to a different type, e.g. cp ./foo.txt ./foo.sh copies a text file to a shell script with the same name in the same directory.
Unix programs
