Similar to update to ip, put help on stdout and usage
on stderr.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 ip/routel | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/ip/routel b/ip/routel
index 09a90126..defe738c 100755
--- a/ip/routel
+++ b/ip/routel
@@ -11,10 +11,11 @@ import getopt
 import subprocess
 
 
-def usage():
+def usage(help=False):
     '''Print usage and exit'''
-    print("Usage: {} [tablenr [raw ip args...]]".format(sys.argv[0]))
-    sys.exit(64)
+    print("Usage: {} [tablenr [raw ip args...]]".format(sys.argv[0]),
+          file=sys.stdout if help else sys.stderr)
+    sys.exit(0 if help else 1)
 
 
 def main():
@@ -23,12 +24,12 @@ def main():
     try:
         opts, args = getopt.getopt(sys.argv[1:], "h46f:", ["help", "family="])
     except getopt.GetoptError as err:
-        print(err)
+        print(err, file=sys.stderr)
         usage()
 
     for opt, arg in opts:
         if opt in ["-h", "--help"]:
-            usage()
+            usage(True)
         elif opt == '-6':
             family = 'inet6'
         elif opt == "-4":
-- 
2.53.0