init creates console, opens 0/1/2, runs sh

sh accepts 0-argument commands (like userfs)
reads from console

1 files changed, 31 insertions, 0 deletions

diff --git a/sh.c b/sh.c
new file mode 100644
index 0000000..e9ed2d9
--- /dev/null
+++ b/sh.c
@@ -0,0 +1,31 @@
+#include "user.h"
+#include "types.h"
+#include "fs.h"
+#include "fcntl.h"
+
+char *args[100];
+
+int
+main(void)
+{
+  char buf[128];
+  int pid;
+
+  while(1){
+    write(1, "$ ", 2);
+    gets(buf, sizeof(buf));
+    if(buf[0] == '\0')
+      continue;
+    pid = fork();
+    if(pid == 0){
+      args[0] = buf;
+      args[1] = 0;
+      exec(buf, args);
+      write(1, buf, strlen(buf));
+      write(1, ": not found\n", 12);
+      exit();
+    }
+    if(pid > 0)
+      wait();
+  }
+}