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Change shell error message to go to STDERR #595

Closed LuQQiu closed 3 years ago

LuQQiu commented 3 years ago

Prerequisite: Alluxio code convention: https://docs.alluxio.io/os/user/stable/en/contributor/Code-Conventions.html Google shell guide: https://google.github.io/styleguide/shellguide.html

Change https://github.com/Alluxio/alluxio/blob/837a41c68b956ded56ae0fd41f0bf26b52ffbf49/bin/alluxio#L226

 echo "${Usage} $0 format [-s]"

to 

 echo "${Usage} $0 format [-s]" >&2