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1.3.1 What is a command?

Command
n. : Statement presented by a human and accepted by a computer in such a manner as to make the human feel as if he is in control.
A command in Linux is a sequence of words (non-blank characters) separated by spaces (blanks). The entire command is terminated by the newline character (Enter or Return). The first word is the command, the remaining words are arguments to the command. Since spaces are used to separate arguments, the arguments themselves must not contain spaces. If for some reason you have to have an argument containing a space (ie; a filename or directory name containing a space) the argument should be surrounded by double quotes (``), or with single quotes or apostrophes ('). Do not use the grave accent (`) for this purpose. Apostrophe and grave are not the same character. Make sure you understand which is which.