• Linux Groups
  • Switching groups
  • Check current group
  • setgid bit on Directories
  • Add user to group
  • umask
  • Password Aging

Linux Groups

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Switching groups

• newgrp groupname

Check current group

Shows the currently assigned group for the current logged on user

• id

setgid bit on Directories

• chmod g+s mydir or
• chmod 2775 mydir

Files created in mydir will have their group set to that of the directory's group.

Add user to group

• /usr/bin/gpasswd -a loginname groupname

umask

Default for all users set in /etc/profile. (Might be in /etc/bashrc)

• umask 002

Password Aging

Turn off and disable password aging

• chage -m -1 -M -1 -W -1 -I 0 -E 2999-12-31 username

-- Frank Dean - 22 Dec 2002

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