Interfaces to exec and its implementations vary. However, if this is done and the program is invoked with one of the exec functions, the program might behave differently from a program invoked directly from the operating-system command line or with one of the spawn functions see below. The final element of the envp array must be null. The argument specifies the path name of the file to execute as the new process image. Other systems may use spawn as the main tool for running executables. The first argument arg0 should be the name of the executable file. Higher-level languages usually provide one call named exec. The exec command can also perform a redirection. A successful exec replaces the current process image, so it cannot return anything to the program that made the call.
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