The following table lists the intrinsic subroutines. Optional arguments are shown within square brackets. All these subroutines are nonelemental except for MVBITS.
| Subroutine | Value Returned or Result |
|---|---|
| CPU_TIME (TIME) | The processor time in seconds |
| DATE (BUF) | The ASCII representation of the current date (in dd-mmm-yy form) |
| DATE_AND_TIME ([DATE] [,TIME] [,ZONE] [,VALUES]) | Date and time information from the real-time clock |
| ERRSNS ([IO_ERR] [,SYS_ERR] [,STAT] [,UNIT] [,COND]) | Information about the most recently detected error condition |
| EXIT ([STATUS]) | Image exit status is optionally returned; the program is terminated, all files closed, and control is returned to the operating system |
| FREE (A) | Frees memory that is currently allocated |
| GETARG (N, BUFFER [,STATUS]) | The specified command line argument (where the command itself is argument number zero) |
| GET_COMMAND ([command, length, status]) | The entire command that was used to invoke the program |
| GET_COMMAND_ARGUMENT (n [, value, length, status]) | A command line argument of the command that invoked the program |
| GET_ENVIRONMENT_VARIABLE (name [, value, length, status, trim_name]) | The value of an environment variable |
| IDATE (I, J, K) | Three integer values representing the current month, day, and year |
| MM_PREFETCH (ADDRESS [,HINT] [,FAULT] [,EXCLUSIVE]) | Data from the specified address on one memory cache line |
| MOVE_ALLOC (FROM, TO) | An allocation is moved from one allocatable object to another. |
| MVBITS (FROM, FROMPOS, LEN, TO, TOPOS)1 | A sequence of bits (bit field) is copied from one location to another |
| RANDOM_NUMBER (HARVEST) | A pseudorandom number taken from a sequence of pseudorandom numbers uniformly distributed within the range 0.0 to 1.0 |
| RANDOM_SEED ([SIZE] [,PUT] [,GET]) | The initialization or retrieval of the pseudorandom number generator seed value |
| RANDU (I1, I2, X) | A pseudorandom number as a single- precision value (within the range 0.0 to 1.0) |
| SYSTEM_CLOCK ([COUNT] [,COUNT_RATE] [,COUNT_MAX]) | Data from the processors real-time clock |
| TIME (BUF) | The ASCII representation of the current time (in hh:mm:ss form) |
| 1 An elemental subroutine | |