have sh print prompt with write, not printf, to make

system call lecture a little clearer.

1 files changed, 1 insertions, 1 deletions

diff --git a/user/sh.c b/user/sh.c
index 36245b3..864405d 100644
--- a/user/sh.c
+++ b/user/sh.c
@@ -134,7 +134,7 @@ runcmd(struct cmd *cmd)
 int
 getcmd(char *buf, int nbuf)
 {
-  fprintf(2, "$ ");
+  write(1, "$ ", 2);
   memset(buf, 0, nbuf);
   gets(buf, nbuf);
   if(buf[0] == 0) // EOF