#include "types.h" #include "user.h" #include "fcntl.h"

int getcmd(char *buf, int nbuf) { printf(2, "@ "); memset(buf, 0, nbuf); gets(buf, nbuf); if(buf[0] == 0) // EOF return -1; return 0; }

// Execute cmd. Never returns. void runcmd(char* buf) { printf(1,"running command! %s ",buf); // int retval; char* args[10]; args[0] = "ls"; args[1] = 0; //printf(1,"executing %s, %s ",args[0],args[1]); exec(args[0],args); exit(); // call exit() if exec() failed }

int main(int argc, char* argv[]) { printf(1,"starting shell "); static char buf[100];

// Read and run input commands. while(getcmd(buf, sizeof(buf)) >= 0){ if(fork() == 0) runcmd(buf); wait(); } exit(); } //create function to parse buf (instead of just hardcoding the 'ls' command as i do here in runcmd //create function to implement pipes and redirection

I need help parsing simple commands like ls which only takes one argument or echo which takes two.

example: ls would display available files in folder

echo hello would display hello to the user. Problem is all that is working is ls but it is hard coded.