In particular, touch and utime match if the file already exists. The touch command is basically equivalent to: 
if utime() fails,
  if create() succeeds,
    close() it (zero bytes written)
  else,
    give an error message

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[ e d @ h a l l e y . c c ]

In reply to Re^2: Changing file modification timestamp by halley
in thread Changing file modification timestamp by monktim

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