RE: [CentOS] migrating users from linux to centos

Hi all

First copy /etc/passwd and /etc/shadow to /tmp of new server

Second go to /tmp of new server

Third, run this script "sh users.sh"

awk -F: '$3>500 {print $1":"$4":"$5":"$6":"$7}' passwd > archivo1 for u in $(cat archivo1 | cut -f 1 -d:); do GROUP1=$(egrep $u: -a archivo1 | cut -f 2 -d:) CMT1=$(egrep $u: -a archivo1 | cut -f 3 -d:) HOME1=$(egrep $u: -a archivo1 | cut -f 4 -d:) SHELL1=$(egrep $u: -a archivo1 | cut -f 5 -d:) useradd -g $GROUP1 -c "$CMT1" -d $HOME1 -s $SHELL1 $u PASSWD=$(egrep $u: -a shadow | cut -f 2 -d:) usermod -p $PASSWD $u done rm -f archivo1

Jose Albornoz

-----Mensaje original----- De: centos-bounces@centos.org [mailto:centos-bounces@centos.org] En nombre de Barry L. Kline Enviado el: Martes, 24 de Julio de 2007 1:47 p.m. Para: CentOS mailing list Asunto: Re: [CentOS] migrating users from linux to centos

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simon wrote:

Dear All,

I have been running linux 9 server as a dns and mail server and is workin fine..

i want to install CENTOS 5 with all the latest mail server software and bind as well as all the libraries on another machine whic is already done

also the data is backed up and will be tranferred.

but i would like to know

i have about existing 100 mail users

how could i tranfer these usernames and passwrd to the new CENtos 5 server

..

if i copy the /etc/passwd from my linux server it gonna overite my centos5 /etc/passwd file as there r new users n also new groups create when i installed centos5 n software also i see that the /etc/shadow has only read permisson for root so cant be over written

is there a way i cd possiblly have the existing users with thier password on centos5 so i dont have to ask them for their passwords n create all users again

Create copies of /etc/{passwd,shadow,group} from the original system. Edit the copies to EXCLUDE existing user/groups. Append the remaining entries to the existing file.

e.g.:

cp /etc/passwd /etc/passwd.old # from the old system vim passwd.old (and edit out the existing entries) copy passwd.old to the new system cat passwd.old >> /etc/passwd (notice the '>>')

Repeat for group & shadow.

Barry

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