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                       ILLUSTRATION                     

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 Let us look at the command syntax for the

 command ls:

    ls  [ -logtasdrucifp ]  filenames

 The information specified in square braces

 is optional and therefore need not be used.

    ls  [ -logtasdrucifp ] filenames       

 Several options bunched together

 may actually be used in that fashion (the brackets

 are used for ease of reading--never type them).

    ls [ -logtasdrucifp ] names