How to execute a shell script from C in Linux?

Question

How can I execute a shell script from C in Linux?

Answer 1

If you're ok with POSIX, you can also use popen()/pclose()

#include 
#include 

int main(void) {
/* ls -al | grep '^d' */
  FILE *pp;
  pp = popen("ls -al", "r");
  if (pp != NULL) {
    while (1) {
      char *line;
      char buf[1000];
      line = fgets(buf, sizeof buf, pp);
      if (line == NULL) break;
      if (line[0] == 'd') printf("%s", line); /* line includes '\n' */
    }
    pclose(pp);
  }
  return 0;
}