warnings (GNU tar 1.35)

### 3.9 Controlling Warning Messages

Sometimes, while performing the requested task, GNU `tar` notices some conditions that are not exactly errors, but which the user should be aware of. When this happens, `tar` issues a warning message describing the condition. Warning messages are output to the standard error and they do not affect the exit code of `tar` command.

GNU `tar` allows the user to suppress some or all of its warning messages:

`--warning=keyword`

  Control display of the warning messages identified by keyword. If keyword starts with the prefix ‘`no-`’, such messages are suppressed. Otherwise, they are enabled.

  Multiple `--warning` options accumulate.

By default, GNU `tar` enables all messages, except those that are enabled in verbose mode (see The `--verbose` Option). See Default Warning Settings, for details.

The subsections below discuss allowed values for keyword along with the warning messages they control.