[vtysh] Make vtysh more useable for scripting
Add environment variable (VTYSH_LOG) for logging.
If a command fails, exit with non-zero exit code and don't
continue multipart commands.
diff --git a/vtysh/vtysh.h b/vtysh/vtysh.h
index 3ed0dd3..e711d59 100644
--- a/vtysh/vtysh.h
+++ b/vtysh/vtysh.h
@@ -42,8 +42,8 @@
void vtysh_readline_init (void);
void vtysh_user_init (void);
-void vtysh_execute (const char *);
-void vtysh_execute_no_pager (const char *);
+int vtysh_execute (const char *);
+int vtysh_execute_no_pager (const char *);
char *vtysh_prompt (void);