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(screen.info)Umask

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aclumask
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 - Command: aclumask [USERS]+/-BITS ...
 - Command: umask [USERS]+/-BITS ...
     (none)
     This specifies the access other users have to  windows  that will
     be  created  by  the caller of the command. USERS may be no, one
     or a comma separated list of known usernames.  If  no  users  are
     specified,  a  list of all currently known users is assumed.  BITS
     is any  combination  of  access  control  bits  allowed defined
     with the `aclchg' command. The special username `?' predefines the
     access that  not  yet  known  users  will  be granted  to any
     window initially.  The special username `??' predefines the access
     that not yet known users  are  granted to any command. Rights of
     the special username nobody cannot be changed (see the `su'
     command).  `Umask' is a synonym to `aclumask'.