Shell Scripts vs z/OS JCL vs System Commands

If TA encounters // as the first two characters in a job file, it will submit it as a TA job to JES2. If the first character of the command is $, the remaining string plus any parameters are submitted as an extended console command. All other files are considered to be shell scripts or programs and are run in USS.

The first line of all USS shell scripts must be #!/bin/sh.

Example: #!/bin/sh
/fin/bin/f101p