(1) (CATegory X) See cable categories.

(2) (conCATenate) A Unix/Linux/Mac OS X command that is used to create a text file, display the contents of a text file or add one file to another (concatenate files). Cat is the Unix counterpart of the Copy Con command in DOS/Windows. Following are some examples. See DOS Copy Con.

  cat > newfile    create text file
  bla bla bla      type the text
  Control-D        press Control-D to exit

  cat newfile      display file "newfile"

  cat f1 f2 > f3   concatenate "f1" and "f2"
                    creating file "f3"