Shell Programming and Scripting

#############################################################
#This script will sync UID across AIX/Linux servers.
##############################################################

#----------------------- Variables -----------------------#
#id=`whoami`
id=
tmpvar="/tmp/{$USER}uid.tmp"


#----------------------- Functions -----------------------#
function check1 {
sudo grep -x $UID /etc/passwd | cut -d: -f3
}

function check2 {
sudo id -u $USER
}

#----------------------------------------------------------#

clear
echo "\n \n \n"
echo "This script will sync UID's across multiple servers." 
echo "It will also find all files owned by the user and set the ownership to the new UID."

echo
USER=
while [ -z "$USER" ] ;
do
echo "What user has an incorrect UID on the servers? \c"
read USER
if [ -z "$USER" ] ; then
echo "You must enter a valid User id...!"
USER=
fi
done

echo
UID=
while [ -z "$UID" ] ;
do
echo "What is the correct UID for $USER ? \c"
read UID
if [ -z "$UID" ] ; then
echo "You must enter a UID...!"
UID=
fi
done

echo
LIST=
while [ -z "$list" ];
do
  echo
  echo "** Which servers do you want to sync UID's up on?"
  echo "** List the servers, space delimited (e.g., server1 server2 server3) \n \t \c"
  read list
    if [ -z "$list" ]; then
      echo "You have to enter at least one server!"
      list=
    fi
done

sleep 2
echo " "
echo " "

echo "Searching to see if the UID is being used on any user on $list."
for server0 in $list
do
   ssh -q $id@$server0 "variable1=`check1`" 
   if [ "variable1 -ne $UID" ]; then
   echo "No UID found"
   else
   echo "UID already in use!!"; exit
fi
done    

sleep 2
echo " "
echo " "

echo "Searching to see if the UID is already being used by $USER"
for server00 in $list
do
   ssh -q $id@$server00 "variable2=`check2`" 
   if [ "$UID -ne $variable2" ]; then 
   echo "UID's are not the same. You may proceed"
   else "$USER already has an ID of $UID"; exit 
fi
done
echo " "
echo " " 
sleep 2
echo " "
echo "Searching for files owned by $USER, on the following servers: $list."
echo "Hold.."
echo "Any file found will be dumped into the temp file: /tmp/uid.tmp"
echo " "

for server in $list
do
   ssh -q $id@$server "sudo find / -user $USER | grep -v proc | grep -v dev > /tmp/{$USER}uid.tmp"
done

sleep 2

# Change the UID
for server2 in $list
do
   ssh -q $id@$server2 "sudo usermod -u $UID $USER"
   echo "If this fails, the UID you're trying to change to is probably in use already"
done

sleep 2

# Change the ownership
chown_command=""
for tmp in $tempvar
do
   chown_command="${chown_command}chown $UID $tmp;"
done

for server3 in $list
do
   ssh -q $id@$server3 "${chown_command}"
done


sleep 2

#Delete the temp files. --- Commented out for Debugging! Manually delete tmp file!! ---
for server4 in $list
do
   ssh -q $id@$server4 "sudo rm /tmp/{$USER}uid.tmp"
done

echo "All finished!"

exit 0