Shell Programming and Scripting

# modifies global variables ID, NAME, SURNAME, D1, D2, D3
function findid
{
        # Read entire file line-by-line hunting for $1
        while IFS=":" read ID NAME SURNAME D1 D2 D3
        do
                # Return success if we find it
                [ "$ID" = "$1" ] && return 0
        done <users.db
        # didn't find it.  return error.
        return 1
}

if findid 999
then
        echo "Found ID $ID name $NAME surname $SURNAME d1 $D1 d2 $D2 d3 $D3"
else
        echo "Couldn't find $ID"
fi

echo "a:b:c:d:e:f" >> users.db