create a new prompt in linux shell using c

Question

I want to create a new prompt with a desired name in linux. And it should work like below.(if my executable name is out)

 original_shell$./out
 my_new_shell>give some input here
 ...
 ...
 some output
 ...
 my_new_shell>done
 original_shell$

How to do this using C, any help is appreciated!

Answer 1

You can do a setenv("PS1", "Your_new_prompt", 1);

I didn't test it but I think it's ok.

Hope it help.

Answer 2

You can use system() to run a new shell with PS1 set:

#include <stdlib.h>

int main() {
    system("PS1='my_new_shell>' bash");
    return 0;
}

Or you can use setenv() and then exec the shell:

#include <stdlib.h>
#include <unistd.h>

int main() {
    setenv("PS1", "my_new_shell>", 1);
    execlp("bash", "bash", (char*)NULL);
    return 0;
}