SCons User Guide 0.97
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Updating the Modification Time of a File: The Touch Factory

If you just need to update the recorded modification time for a file, use the Touch factory: 

      Command("file.out", "file.in",
              [
                Copy("tempfile", "$SOURCE"),
                "modify tempfile",
                Move("$TARGET", "tempfile"),
              ])

Which executes as: 

      % scons -Q
      Copy("tempfile", "file.in")
      modify tempfile
      Move("file.out", "tempfile")
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Moving (Renaming) Files or Directories: The Move FactoryUpCreating a Directory: The Mkdir Factory