Operational Control Language is a historical programming language created in 1986.

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Example code from Wikipedia:

** Procedure PROC1
** 
** Written by Joe User 2006-05-29
**
** 
// * 'PROC1 procedure is running'
// * ' '
// IFF ACTIVE-'PROC2,PROC3' GOTO OKAY
** IFF means 'if false'
** ACTIVE-'nnn,nnn2' means at least one of the listed programs is currently running
** GOTO xxx means skip to the statement that says TAG xxx and resume processing
// PAUSE ' Cannot continue because other Payroll is running'
// CANCEL                                               stops execution of this procedure
// TAG OKAY
// IFF DATAF1-PFILE1 IFF DATAF1-PFILE2 GOTO NODELT
// * ' Caution, Pay Data Exists'                        displays info on CRT
// * ' '
// * ' Press 1 to continue and DELETE existing files'
// IFF '1'=?1R? CANCEL     A parameter is indicated by question marks surrounding a number
** Using 1R between question marks indicates that the parameter is required and processing
** waits for user input.  CANCEL means immediately go to end of job.
// LOAD $DELET                                         $DELET is used to delete files
// RUN
// IF DATAF1-PFILE1 SCRATCH UNIT-F1,LABEL-PFILE1       deletes a disk file
// IF DATAF1-PFILE2 SCRATCH UNIT-F1,LABEL-PFILE2
// END                                              END returns control from a system program
// LOAD PR101                                          PR101 is the sample RPG program
// FILE NAME-PAYMAST,DISP-SHR                          PAYMAST is the payroll master file
// FILE NAME-PFILE1,DISP-NEW,RECORDS-100,EXTEND-100    A new file PFILE1 is created
** 100 records are assigned to PFILE1 - if full, the system tries to extend it by another 100
** each time it fills.
// RUN
** It's not necessary or valid to put an END statement after most user programs
// SWITCH 1XXXXXXX                                    Causes U1 to be SETON in the RPG program
// LOCAL OFFSET-1,DATA-'PROC1'      Places PROC1 in the Local Data Area
// LOCAL OFFSET-101,DATA-'?USER?'   Substitutes the operator's User ID                        
** LDA becomes the external data structure (UDS) in an RPG program
// LOAD PR102
// FILE NAME-PAYMAST,DISP-SHR                         DISP-SHR means the file is shared
** Other programs can use PAYMAST at the same time
// FILE NAME-PFILE,LABEL-PFILE1
** NAME/LABEL is used when the RPG disk file and the actual disk file names are different.
// RUN
// RETURN                                             Return means go to end-of-job
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Last updated February 11th, 2019