*** 3000shell.c	2021-01-22 00:57:39.000000000 -0500
--- 3000shell-cd.c	2025-02-22 16:07:48.200586245 -0500
***************
*** 28,33 ****
--- 28,35 ----
  
  const char *proc_prefix = "/proc";
  
+ char *pwd;
+ 
  void parse_args(char *buffer, char** args, 
                  size_t args_size, size_t *nargs)
  {
***************
*** 187,192 ****
--- 189,204 ----
          }
  }
  
+ void cd(char *dir)
+ {
+ 	char pname[4096];
+ 	if (NULL == dir)
+ 		dir = getenv("HOME");
+ 
+ 	if (chdir(dir) || getcwd(pname, 4096) == NULL || setenv("PWD", pname, 1))
+ 		printf("Error entering directory %s\n", dir);
+ }
+ 
  void signal_handler(int the_signal)
  {
          int pid, status;
***************
*** 261,267 ****
          char *stdout_fn;
          
          while(1){
!                 printf("%s $ ", username);
                  s = fgets(buffer, BUFFER_SIZE, stdin);
                  
                  if (s == NULL) {
--- 273,281 ----
          char *stdout_fn;
          
          while(1){
! 		pwd = getenv("PWD");
! 
!                 printf("%s:%s $ ", username, pwd);
                  s = fgets(buffer, BUFFER_SIZE, stdin);
                  
                  if (s == NULL) {
***************
*** 283,288 ****
--- 297,307 ----
                          continue;
                  }
  
+                 if (!strcmp(args[0], "cd")) {
+                         cd(args[1]);
+                         continue;
+                 }
+ 
                  background = 0;            
                  if (strcmp(args[nargs-1], "&") == 0) {
                          background = 1;