How colon and semicolon differs in linux command? -

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how colon , semicolon differs in following linux commands? 

    i:       i;

in case doesn't matter much.

usually, ; used mark end of command in situations:

if [[ ... ]]; ...; else ...; fi

the who command, however, produce same output regardless of 2 words on command line is. : not special:

$  $ makes dinner  $ ano.l::e se=el

these produce exact same output.

so, answer question:

  1. the : part of word i: , doesn't mean special here.
  2. the semicolon marks end of command, , not needed since there no other command on line after it.

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