bash/slrn: add netrc usage

bin/netrc

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+
+import sys
+from netrc import netrc
+
+if len(sys.argv) < 2:
+    print("Usage: netrc machine [env_prefix]")
+    sys.exit(1)
+
+prefix=""
+machine = sys.argv[1]
+if len(sys.argv) > 2: prefix = sys.argv[2]
+
+n = netrc()
+if machine in n.hosts.keys():
+    entry = n.hosts[machine]
+    print("export %sUSER=%s" % (prefix, entry[0]))
+    print("export %sPASS=%s" % (prefix, entry[2]))
+else:
+    print("echo %s not found in .netrc" % machine)
+    sys.exit(2)