newgrp - switch to a new group
newgrp [-] [group]
The newgrp command changes your group ID without changing your user ID
and replaces your current shell with a new one.
If you specify group, the change is successful if group exists and
either your user ID is a member of the new group, or group has a
password and you can supply it from the terminal.
If you omit group, newgroup changes to the group specified in your
entry in the password file, /etc/passwd.
Whether the group is changed successfully or not, or the new group is
the same as the old one or not, newgrp proceeds to replace your
current shell with the one specified in the shell field of your
password file entry. If that field is empty, newgrp uses the POSIX
shell, /usr/bin/sh (see sh-posix(1)).
If you specify - (hyphen) as the first argument, the new shell starts
up as if you had just logged in. If you omit -, the new shell starts
up as if you had invoked it as a subshell.
You remain logged in and the current directory is unchanged, but
calculations of access permissions to files are performed with respect
to the new real and effective group IDs.
Exported variables retain their values and are passed to the new
shell. All unexported variables are deleted, but the new shell may
reset them to default values.
Since the current process is replaced when the new shell is started,
exiting from the new shell has the same effect as exiting from the
shell in which newgrp was executed.
International Code Set Support
Characters from the 7-bit USASCII code set are supported in group
names (see ascii(5)).
The newgrp command issues the following error messages:
Sorry Your user ID does not qualify as a group
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
Unknown group The group name does not exist in
Permission denied If a password is required, it must come
from a terminal.
You have no shell Standard input is not a terminal file,
causing the new shell to fail.
To change from your current group to group users without executing the
To change from your current group to group users and execute the login
newgrp - users
There is no convenient way to enter a password into /etc/group.
The use of group passwords is not recommended because, by their very
nature, they encourage poor security practices. Group passwords may
be eliminated in future HP-UX releases.
/etc/group System group file
/etc/passwd System password file
csh(1), ksh(1), login(1), sh-bourne(1), sh-posix(1), group(4),
newgrp: SVID2, SVID3, XPG2, XPG3, XPG4
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000