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+.\" Original author unknown. This man page is in the public domain.
+.\" Modified Sat Oct 9 17:46:48 1993 by faith@cs.unc.edu
+.TH NEWGRP 1 "October 1993" "util-linux" "User Commands"
+.SH NAME
+newgrp \- log in to a new group
+.SH SYNOPSIS
+.B newgrp
+.RI [ group ]
+.SH DESCRIPTION
+.B newgrp
+changes the group identification of its caller, analogously to
+.BR login (1).
+The same person remains logged in, and the current directory
+is unchanged, but calculations of access permissions to files are performed
+with respect to the new group ID.
+.LP
+If no group is specified, the GID is changed to the login GID.
+.LP
+.SH FILES
+.I /etc/group
+.br
+.I /etc/passwd
+
+.SH "SEE ALSO"
+.BR login (1),
+.BR group (5)
+
+.SH AUTHOR
+Originally by Michael Haardt. Currently maintained by
+Peter Orbaek (poe@daimi.aau.dk).
+
+.SH AVAILABILITY
+The newgrp command is part of the util-linux package and is available from
+https://www.kernel.org/pub/linux/utils/util-linux/.