git-diff.txt: add section "output format" describing the diff formats

diff --git a/shell.c b/shell.c
index 8c08cf0fb339d293383c3dacb8cdfc805afa3727..c983fc7b86ed3c7792d4e325e4b88845719494d1 100644 (file)
--- a/shell.c
+++ b/shell.c
@@ -8,7 +8,7 @@ static int do_generic_cmd(const char *me, char *arg)
 
        if (!arg || !(arg = sq_dequote(arg)))
                die("bad argument");
-       if (strncmp(me, "git-", 4))
+       if (prefixcmp(me, "git-"))
                die("bad command");
 
        my_argv[0] = me + 4;