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NEWGRP(1)                   General Commands Manual                  NEWGRP(1)

       newgrp - log in to a new group

       newgrp [ - ] [ group ]

       newgrp  changes  a  user's  group identification.  Only the group-ID is
       changed; the user remains a member of all groups previously established
       by  setgroups  (see getgroups(2V)).  The user remains logged in and the
       current directory is unchanged, but the group-ID of newly-created files
       will  be set to the new effective group-ID (see open(2V)).  The user is
       always given a new shell, replacing the current  shell,  regardless  of
       whether  newgrp  terminated  successfully  or due to an error condition
       (such as an unknown group).

       Exported variables retain their values after invoking newgrp;  however,
       all unexported variables are either reset to their default value or set
       to null.  System variables (such as HOME, LOGNAME, PATH,  SHELL,  TERM,
       and  USER), unless exported by the system or explicitly exported by the
       user, are reset to default values.  Note: the shell command export (see
       sh(1))  is  the  method  to export variables, while the C shell command
       setenv (see csh(1)) implicitly exports its argument.

       With no arguments, newgrp changes the group identification back to  the
       group specified in the user's password file entry.

       If the first argument to newgrp is a `-', the environment is changed to
       what would be expected if the user actually logged in again.

       A password is demanded if the group has a password and  the  user  does
       not,  or  if  the  group  has  a password and the user is not listed in
       /etc/group as being a member of that group.

       /etc/group          system group file
       /etc/passwd         system password file

       csh(1),  login(1),  sh(1),  su(1V),  open(2V),   getgroups(2V),   init-
       groups(3), environ(5V), group(5), passwd(5)

       For  consistency with login naming rules (which do not allow 8-bit file
       names), group identifications cannot  contain  8-bit  characters.   See
       login(1) for explanations about why login is not 8-bit clean.

       There is no convenient way to enter a password into /etc/group.  Use of
       group passwords is not encouraged, because, by their very nature,  they
       encourage  poor  security  practices.  Group passwords may disappear in
       the future.

                               16 November 1987                      NEWGRP(1)