Shell Programming and Scripting

#!/bin/bash
echo -e  "Create a new record\n"

fSID (){
read -p "Please enter staff ID: " cSID
}

fSID

gcSID=$(grep $cSID users.db | cut -d ":" -f1 | tr [":"] [" "])
wcSID=$(echo $cSID | wc -c) 

case "$cSID" in
      [!0-9]*         ) echo -e "The staff ID should contain only digits\n "
	  sleep 0.5
	  fSID;;
                  
esac  
    while [ $wcSID -gt 4 ]; do 

  read -p "Please enter a value: " cSID 
wcSID=$(echo $cSID | wc -c) 
echo $wcSID
done 
read -p "u passed to stage 2! gratz" st2

STR=""
until [ "${#STR}" -eq 3 ] && [ -z "${STR/[0-9]*/}" ] && ! grep "$STR" user.db > /dev/null
do
         read STR
done

while true
do
        read ID
        if [ "${#ID}" -ne 3]
        then
                echo "wrong number of digits"
                continue
        fi

        if ! [ -z "${ID/[0-9]*/}" ]
        then
                echo "Not all digits"
                continue
        fi

        if grep "$ID" users.db > /dev/null
        then
                echo "The string '$ID' exists anywhere at all in users.db"
                continue
        fi
        break # get out of loop
done