error exit status is 1

1 files changed, 2 insertions, 2 deletions

diff --git a/user/grep.c b/user/grep.c
index 43406b8..19882b9 100644
--- a/user/grep.c
+++ b/user/grep.c
@@ -41,7 +41,7 @@ main(int argc, char *argv[])
 
   if(argc <= 1){
     fprintf(2, "usage: grep pattern [file ...]\n");
-    exit(-1);
+    exit(1);
   }
   pattern = argv[1];
 
@@ -53,7 +53,7 @@ main(int argc, char *argv[])
   for(i = 2; i < argc; i++){
     if((fd = open(argv[i], 0)) < 0){
       printf("grep: cannot open %s\n", argv[i]);
-      exit(-1);
+      exit(1);
     }
     grep(pattern, fd);
     close(fd);