df: error on duplicate columns in --output arg #3322
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Print a usage error when duplicat column names are specified to the
`--output` command-line argument. For example,
$ df --output=source,source
df: option --output: field ‘source’ used more than once
Try 'df --help' for more information.
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Print a usage error when duplicat column names are specified to the
--outputcommand-line argument. For example,