uid - find free user ID
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Overview and program invokation
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uid <min> <max>

Searches for a free user ID between (including) <min> and <max>.


uid -c <min> <max>

configures subsequent calls to uid to search between <min> and <max>.


uid -u

removes configuration information.


Example:

uid 3111 4000

searches for a free UID between 3111 and 4000.