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UNIX was originally written for people using slow and clumsy
teletype (hardcopy) terminals.
The fewer the number of characters typed the better.
For that reason, many UNIX commands are very short: two or three letters.
The options, called flags, are also very short: usually one character.
The syntax for some commands will be described in this chapter
along with some of the options, or flags.
However, as this is only an introduction to UNIX,
many flags for many commands will
NOT be mentioned.
It is the user's responsibility to verify which flags/options are available
on their machine.
Short commands are usually not very mnemonic.
But there are always tricks to help remember their meaning.