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Each time you change the terminal line settings or add new entries to gettydefs, you should check to make sure that the new values make sense to getty. To do this, you use the command getty with the check option, -c, and the filename.
For example, to check gettydefs, enter:
getty -c /etc/gettydefs
The file is scanned and the results are displayed. If any of the values and settings in gettydefs are not permitted, getty -c reports them. For more information on getty and gettydefs, see the getty(M) and gettydefs(F) manual pages.