Run master SQLLDR scripts in UNIX environment

I got two SQLLDR scripts below. I will combine this two scripts and create a master SQLLDR script (master_script.ctl). The database server is in UNIX. All the source data files are in specified location below (inside scripts) in UNIX server. So, the master script needs to run at the UNIX command prompt and at the end of run data will be loaded into database tables TEST.TABLE_A & TEST.TABLE_B.

Do I need to write a shell script in order to execute this master_script.ctl?  Is there another option. Please provide an example.......

load data
infile '/u02/loaddata/natcity/V_STATUS_LOGIN_NCC.TXT'
replace into table TEST.TABLE_A
(
Login_ID                  position(1:9),
Password                  position(10:17),
Create_Date                  position(18:27)
);

load data
infile '/u02/loaddata/natcity/V_STATUS_HIST_NCC.TXT'
replace into table TEST.TABLE_B
(
Member_ID                        position(1:9),
Member_Status                  position(10:11),
Change_Method_Code                  position(12:15)
);