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Is it possible to run robocopy in some sort of "completely silent" mode?

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Any command-line utility can be made completely silent by redirecting stdout and stderr to the special file 'nul'. This is Windows' equivalent to /dev/null on *nix systems.

command >nul (stdout is not echoed)

command 2>nul (stderr is not echoed)

command >nul 2>&1 (neither stdout nor stderr is echoed)

The latter is the one you want to make it completely silent.

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    >nulis batch syntax and not valid for powershell... Use >$null instead. (Applies, if robocopy is triggered from PS rather than BAT)
    – dognose
    May 11, 2017 at 20:26

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