Migrating users from server to server. Scirpt to run on old server

migration_dest.sh

#!/bin/bash
MIGRATIONBACKUPDIR=migration_backup
mkdir $MIGRATIONBACKUPDIR
cp /etc/passwd /etc/shadow /etc/group /etc/gshadow $MIGRATIONBACKUP
cd $1
cat passwd.mig >> /etc/passwd
cat group.mig >> /etc/group
cat shadow.mig >> /etc/shadow
tar -zxvf home.tar.gz -C /

migration_source.sh

#!/bin/bash
UGIDLIMIT=1000
DEST=sobieski.3lab.re
MIGRATIONDIR=migration
mkdir $MIGRATIONDIR
awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd > $MIGRATIONDIR/passwd.mig
awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/group > $MIGRATIONDIR/group.mig
awk -v LIMIT=$UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534) {print $1}' /etc/passwd | tee - |egrep -f - /etc/shadow > $MIGRATIONDIR/shadow.mig
tar -zcvpf --preserve-ownership --numeric-owner $MIGRATIONDIR/home.tar.gz /home
rsync -Ravz -e "ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null" --progress $MIGRATIONDIR $DEST:~/
ssh root@$DEST 'bash -s' < migration_dest.sh $MIGRATIONDIR