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(screen.info)Aclchg

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Aclchg
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 - Command: aclchg USERNAMES PERMBITS LIST
 - Command: chacl USERNAMES PERMBITS LIST
     (none)
     Change permissions for a comma separated list of users.
     Permission bits are represented as `r', `w' and `x'.  Prefixing
     `+' grants the permission, `-' removes it. The third parameter is
     a comma separated list of commands or windows (specified either by
     number or title). The special list `#' refers to all windows, `?'
     to all commands. If USERNAMES consists of a single `*', all known
     users is affected.  A command can be executed when the user has
     the `x' bit for it. The user can type input to a window when he
     has its `w' bit set and no other user obtains a writelock for this
     window. Other bits are currently ignored.  To withdraw the
     writelock from another user in e.g. window 2: `aclchg USERNAME
     -w+w 2'. To allow read-only access to the session: `aclchg
     USERNAME -w "#"'. As soon as a user's name is known to screen, he
     can attach to the session and (per default) has full permissions
     for all command and windows. Execution permission for the acl
     commands, `at' and others should also be removed or the user may
     be able to regain write permission.  `Chacl' is a synonym to
     `aclchg'.  Multi-user mode only.