The X statement issues
a UNIX command from within a SAS session. SAS executes the X statement
immediately.
Neither the X statement
nor the %SYSEXEC macro program statement is intended for use during
the execution of a DATA step. The CALL SYSTEM routine, however, can
be executed within a DATA step.
For an example, see CALL SYSTEM Routine: UNIX.
Note: The X statement is not supported
without arguments under the X Window System.