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- exec is used to execute the given process by replacing the
current process.
- If the given process get executed successfully then exec will not return the value. - exec returns the value in case of failure only. - System is also doing the same thing as exec but system returns value in both success and failure cases. - And parent process waits for the child process to complete. - System() runs the command through a shell,while exec() runs the command directly. - fork is used to create a new process(child process). - And it is returning the PID of child to parent and zero to child if the fork is successful. - The difference between the fork and exec is exec replaces the current process but fork doesn't. - pipe is used for communicating between two processes. - We can use both named and nameless pipes. - It returns open a pair of pipes. - In one end we can write. - And in another end we can read the content. - syscall is used to call the system call which is specified as a first argument. - Remaining elements are the arguments to the system call. For more details visit the following link also. Perl IPC In reply to Re^2: difference between exec, system, fork, pipe, syscall and eval
by kiruthika.bkite
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