I am writing a shell and I need to write a built-in command, 'pid' that will print the pid of the shell. I cannot for the life of me figure out how to only display the shell's pid. Can someone please help me out here? I am writing this in C and running it on a unix system.

Thanks!

if your C program is run from the shell then the get parent PID function, getppid(), will return the PID of the shell, eg;

<pre>
#include <sys/types.h>
#include <unistd.h>

pid_t getppid(void);

int main(int argc, char* argv[])
{
printf("parent pid: %i\n",getppid());
}
</pre>

This is the same as;

echo $PPID

when executed in a script.