Mac Developer Library Developer
Search

 

This manual page is for Mac OS X version 10.9

If you are running a different version of Mac OS X, view the documentation locally:

  • In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

  • To learn how the manual is organized or to learn about command syntax, read the manual page for manpages(5).

  • For more information about this technology, look for other documentation in the Apple Developer Library.

  • For general information about writing shell scripts, read Shell Scripting Primer.




NEWGRP(1)                 BSD General Commands Manual                NEWGRP(1)

NAME
     newgrp -- change to a new group

SYNOPSIS
     newgrp [-l] [group]

DESCRIPTION
     The newgrp utility creates a new shell execution environment with modified real and effective group
     IDs.

     The options are as follows:

     -l      Simulate a full login.  The environment and umask are set to what would be expected if the user
             actually logged in again.

     If the group operand is present, a new shell is started with the specified effective and real group
     IDs.  The user will be prompted for a password if they are not a member of the specified group.

     Otherwise, the real, effective and supplementary group IDs are restored to those from the current
     user's password database entry.

EXIT STATUS
     The newgrp utility attempts to start the shell regardless of whether group IDs were successfully
     changed.

     If an error occurs and the shell cannot be started, newgrp exits >0.  Otherwise, the exit status of
     newgrp is the exit status of the shell.

SEE ALSO
     csh(1), groups(1), login(1), sh(1), su(1), umask(1), group(5), passwd(5), environ(7)

STANDARDS
     The newgrp utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     A newgrp utility appeared in Version 6 AT&T UNIX.

BUGS
     Group passwords are inherently insecure as there is no way to stop users obtaining the crypted pass-words passwords
     words from the group database.  Their use is discouraged.

BSD                              May 23, 2002                              BSD

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors
Report errors in the content of this documentation with the feedback links below.
Bug reports
Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems
Report formatting mistakes in the online version of these pages with the feedback links below.

Feedback