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ChorusOS man pages section 1M: System Management Utilities
    
U
 
 ulimit -- C_INIT built-in command: sets or displays resource limits ( Index Term Link )
 
 umask -- C_INIT built-in command: Displays or sets the file creation mask ( Index Term Link )
 
 umount -- unmount file systems ( Index Term Link )
 
 unsetenv -- C_INIT built-in command: unsets the environment variable ( Index Term Link )