copy unix users member of a specific group to another server

move_users.sh

#!/bin/sh
# Move users from a specific group to an other server, including their
# .ssh-files. The script was created for migration of svn users to an 
# other server.

# version 0.0.5

# Created by Jesper Grann Laursen <[email protected]>
# Gist: https://gist.github.com/1164958

# --- TODO ---
# * Ensure that users and groups not already are on the remote server
# * Update users homedir path in passwd on remote server
# * Test! :)

# --- Setup ---

# Group name to copy users
groupname="svn"

# lists of members
users=$(grep $groupname /etc/group |cut -f 4 -d ':'|sed 's/,/|/g')

# tmpdir
tmpdir="~/tmp/MOVE"
remotetmpdir="MOVE"

# --- Action ----

echo "Save userdata to $tmpdir"

if [ "$(id -u)" != "0" ]; then 
	echo "Need to be root!"
	exit 1
fi

mkdir -p $tmpdir

# Copy users and group
awk -v USERS=$users -F: '$1 ~ "^("USERS")$" {print $0}' /etc/passwd >$tmpdir/passwd.move
awk -v GROUP=$groupname -F: '$1 ~ "^("GROUP")$" {print $0}' /etc/group >$tmpdir/group.move
# Shadow files
awk -v USERS=$users -F: '$1 ~ "^("USERS")$" {print $0}' /etc/shadow >$tmpdir/shadow.move
awk -v GROUP=$groupname -F: '$1 ~ "^("GROUP")$" {print $0}' /etc/gshadow >$tmpdir/gshadow.move

# Copy userdirs
userdatalist=$(awk -v USERS=$users -F: '$1 ~ "^("USERS")$" {print $1","$6}' /etc/passwd)
newuserlist=""
for userdata in $userdatalist; do
	user=$(echo "$userdata" | cut -f 1 -d ',')
	userdir=$(echo $userdata  | cut -f 2 -d ',')
	if [ -r $userdir/.ssh ]; then
		cd $userdir
		tar -zcpf $tmpdir/$user.tar.gz .ssh
		echo "Saved: " $tmpdir/$user.tar.gz
	fi
	newuserlist="$newuserlist $user"		
done

# done copy
echo "Done copying to $tmpdir"
echo "---"

echo "Complete the move by moving the files to the new server"
echo "scp -r $tmpdir $(whoami)@server:$remotetmpdir"

echo "Run these commands as root on the _remote_ server"
echo "-"

cat << EOF
cat $remotetmpdir/passwd.move >>/etc/passwd
cat $remotetmpdir/group.move >>/etc/group
cat $remotetmpdir/shadow.move >>/etc/shadow
cat $remotetmpdir/gshadow.move >>/etc/gshadow
EOF

# export userdirs
if [ ! -z "$newuserlist" ]; then
cat << EOF 
	cd $remotetmpdir
	for user in $newuserlist; do  
		mkdir -p /home/\$user
		chown -R \$user /home/\$user
		cd /home/\$user
		if [ -f $remotetmpdir/\$user.tar.gz ]; then
			tar -zxvf $remotetmpdir/\$user.tar.gz
		fi
	done
EOF
fi

exit 0