Articles in Users and Groups
Here is a quick example showing how to count users logged in on a particular date using the “last” command on Linux.
1. in old user’s home dir.
oldgroup=<oldgroup>
newgroup=<newgroup>
username=<username>
tar cvf – `find . -print` > backup.tar
mkdir /home/users/${newgroup}/${username}
mv backup.tar /home/users/${newgroup}/${username}/
cd /home/users/${newgroup}/${username}/
tar -xvf backup.tar
find . -group ${oldgroup} -exec chgrp ${newgroup}{} \;
find . -type l -group ${oldgroup} -exec chgrp -h ${newgroup}{} …


