Please post the output of the script.
Specially echo "$count"
BTW,
1) ";" only required as the command terminator if multiple commands are on the same line
2) use -eq as the integer equality comparison instead ==
3) In select query, you should use emp_id = $emp_id_ ( Assuming the datatype is Number)
So now you can see the $count is not equals to just "1". there are column headers and other stuffs along with the value.
you must do "set heading off" inside sqlplus.
You might also require to suppress the white spaces before and after the value either db level or shell level.