OPERATION CODE SUMMARY

Table 5.2 lists RPG operations along with brief descriptions.

Table 5.2: Alphabetical List of Operation Codes

Op Code	Description
ACQ	Acquire a program device.
ADD	Add two values together.
ADDDUR	Add duration to a DATE, TIME, or TIMESTAMP value.
ALLOC	Allocate memory and runtime.
ANDxx	Extend IFxx, DOWxx, DOUxx, and WHENxx conditioning.
BEGSR	Begin a subroutine.
BITOFF	Set off individual bits with a field.
BITON	Set on individual bits with a field.
CABxx	Compare two values, then branch to a label.
CALL	Call another program.
CALLB	Call a bound-in procedure.
CALLP	Call with prototype.
CASxx	Compare two values, then call a subroutine.
CAT	Concatenate factor 1 to factor 2.
CHAIN	Random file access by index.
CHECK	Verify the data in factor 2 against factor 1 (from left to right).
CHECKR	Verify the data in factor 2 against factor 1 (from right to left).
CLEAR	Clear data structure, variable, or record format.
CLOSE	Close a file.
COMMIT	Commitment control, commit group.
COMP	Compare two values and set on/off resulting indicators.
DEFINE	Define one field like another field.
DEALLOC	Release memory back to the system at runtime.
DELETE	Delete a database record.
DIV	Divide two values.
DO	Begin DO loop with an optional counter.
DOU	Begin DO UNTIL loop using expression conditioning.
DOUxx	Begin DO UNTIL loop.
DOW	Begin DO WHILE loop using expression conditioning.
DOWxx	Begin DO WHILE loop.
DSPLY	Display a message at the workstation.
DUMP	Print a formatted dump.
ELSE	Else clause, used in conjunction with the IFxx operation.
ELSEIF	A combined ELSE and IF statement.
END	End a DO, DOWxx, DOUxx, CASxx, IFxx, or SELECT group.
ENDCS	End a CASxx group.
ENDDO	End a DO, DOWxx ,or DOUxx loop.
ENDFOR	End a FOR loop.
ENDIF	End an IFxx group.
ENDMON	End a MONITOR/ON-ERROR group.
ENDSL	End a SELECT group.
ENDSR	End of a subroutine.
EVAL	Evaluate an expression. Left justifies result for character expressions.
EVALR	Evaluate an expression. Right justifies result for character expressions.
EXCEPT	Write a program-defined or externally described record format.
EXFMT	Write, and then read, a workstation device.
EXSR	Call an intra-program subroutine.
EXTRCT	Extract a component of a DATE, TIME, or TIMESTAMP value.
FEOD	Cause a file "cursor" reset; free locked records.
FOR	Begin a FOR loop using expression syntax.
FORCE	Force input priority alteration.
GOTO	Perform an unconditional branch to a label.
IFxx	Compare two values and perform a block of code.
IN	Retrieve an external data area's data.
ITER	Iterate a DO, DOWxx, or DOUxx loop.
KFLD	Define a key field of a key list.
KLIST	Define a key list used to access an indexed file.
LEAVE	Leave a DO, DOWxx, or DOUxx loop.
LEAVESR	Leave the current subroutine and immediately return to its caller.
LOOKUP	Search an array or table for like or unlike elements.
MHHZO	Move high zone to high zone.
MHLZO	Move high zone to low zone.
MLHZO	Move low zone to high zone.
MLLZO	Move low zone to low zone.
MONITOR	Begin a block of code that is monitored for errors.
MOVE	Copy data, right-justified, from a field or constant to field.
MOVEA	Copy data, left-justified, to all successive array elements.
MOVEL	Copy data, left-justified, from a field or constant to a field.
MULT	Multiply two values.
MVR	Copy the remainder of a preceding division to a field.
NEXT	Force the next input cycle to read input from a specific device.
OCCUR	Set/get the occurrence of a multiple occurrence data structure.
ON-ERROR	Begin an error trap block of code.
OPEN	Open a file.
ORxx	Extend IFxx, DOWxx, DOUxx, and WHENxx conditioning.
OTHER	Otherwise clause of a SELECT/WHEN group.
OUT	Update an external data area.
PARM	Define a parameter field within a parameter list.
PLIST	Define a parameter list.
POST	Retrieve and post device-specific information to a data structure.
READ	Read from a file.
READC	Read next changed subfile record.
READE	Read the next data file record with equal key index.
READP	Read previous data file record.
READPE	Read previous data file record with equal key index.
REALLOC	Reallocate memory of a new size at runtime.
REL	Release an acquired program device.
RESET	Reset a variable to its initial value.
RETURN	Return to calling program.
ROLBK	Commitment control, roll back group.
SCAN	Scan argument for search pattern and return position.
SELECT	Begin an in-line SELECT/WHEN case group.
SETGT	Set the file cursor greater than the specified index.
SETLL	Set the file cursor less than the specified index.
SETOFF	Set an indicator off.
SETON	Set an indicator on.
SHTDN	Test for system shut down.
SORTA	Sort an array.
SQRT	Compute the square root of a number.
SUB	Subtract one value from another.
SUBDUR	Subtract a duration from a DATE, TIME, or TIMESTAMP value. Calculate the duration between two DATE, TIME, or TIMESTAMP values.
SUBST	Copy substring value in factor 2 to the result field.
TAG	Define the location and name of a label.
TESTB	Test bit pattern.
TESTN	Test character field for numeric data.
TESTZ	Test the zone of the rightmost position of a field.
TEST	Test for a valid DATE, TIME, or TIMESTAMP value.
TIME	Retrieve the system time and date.
UNLOCK	Unlock an external data area object. Unlock a database record.
UPDATE	Update a file.
WHENxx	When select condition is true, then do.
WRITE	Write to a file.
XFOOT	Cross foot (sum up) an array.
XLATE	Translate factor 2 using translate data in factor 1.
Z-ADD	Zero and add numeric.
Z-SUB	Zero and subtract numeric.