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RedHat 9 (Linux i386) - man page for sg (redhat section 1)

NEWGRP(1)						     Linux Programmer's Manual							 NEWGRP(1)

NAME
newgrp - log in to a new group
SYNOPSIS
newgrp [ group ]
DESCRIPTION
Newgrp changes the group identification of its caller, analogously to login(1). The same person remains logged in, and the current direc- tory is unchanged, but calculations of access permissions to files are performed with respect to the new group ID. If no group is specified, the GID is changed to the login GID.
FILES
/etc/group /etc/passwd
SEE ALSO
login(1), group(5)
AUTHOR
Originally by Michael Haardt. Currently maintained by Peter Orbaek (poe@daimi.aau.dk). Linux 1.2 9 October 1993 NEWGRP(1)