syncusers

sourceServer=172.16.1.121

function syncusers() {
    scp $sourceServer:/etc/passwd /tmp/passwd.$sourceServer
    scp $sourceServer:/etc/group /tmp/group.$sourceServer
    scp $sourceServer:/etc/shadow /tmp/shadow.$sourceServer

    # First, make a list of non-system users that need to be moved.

    local UGIDLIMIT=500
    awk -v LIMIT=$UGIDLIMIT -F: '($3 >= LIMIT) && ($3 != 65534)' /tmp/passwd.$sourceServer > /tmp/passwd.mig
    awk -v LIMIT=$UGIDLIMIT -F: '($3 >= LIMIT) && ($3 != 65534)' /tmp/group.$sourceServer >/tmp/group.mig
    awk -v LIMIT=$UGIDLIMIT -F: '($3 >= LIMIT) && ($3 != 65534) { print $1 }' /tmp/passwd.$sourceServer \
        | tee - |egrep -f - /tmp/shadow.$sourceServer > /tmp/shadow.mig

    # Now copy non-duplicate entries in to the new server files...
    while IFS=: read user pass uid gid full home shell
    do
        line="$user:$pass:$uid:$gid:$full:$home:$shell"
        exists=$(grep $user /etc/passwd)
        if [ -z "$exists" ]
        then
            echo "Copying entry for user $user to new system"
            echo $line >> /etc/passwd
        fi
    done </tmp/passwd.mig

    while IFS=: read group pass gid userlist
    do
        line="$group:$pass:$gid:$userlist"
        exists=$(grep $group /etc/group)
        if [ -z "$exists" ]
        then
            echo "Copying entry for group $group to new system"
            echo $line >> /etc/group
        fi
    done </tmp/group.mig

    while IFS=: read user pass lastchanged minimum maximum warn
    do
        line="$user:$pass:$lastchanged:$minimum:$maximum:$warn"
        exists=$(grep $user /etc/passwd)
        if [ -z "$exists" ]
        then
            echo "Copying entry for user $user to new system"
            echo $line >> /etc/shadow
        fi
    done </tmp/shadow.mig
}

syncusers