running shell script using c programming

Question

hello every one I want to ask that I am making a program in which i have to run shell script using c program. up till now i have separated the arguments. and i have searched tha

Answer 1

All exec* library functions are ultimately convenience wrappers over the execve() system call. Just use the one that you find more convenient.

The ones that end in p (execlp(), execvp()) use the $PATH environment variable to find the program to run. For the others you need to use the full path as the first argument.

The ones ending in e (execle(), execve()) allow you to define the environment (using the last argument). This way you avoid potential problems with $PATH, $IFS and other dangerous environment variables.

The ones wih an v in its name take an array to specify arguments to the program to run, while the ones with an l take the arguments to the program to run as variable arguments, ending in (char *)NULL. As an example, execle() is very convenient to construct a fixed invocation, while execv* allow for a number of arguments that varies programatically.