eoptasks: add examples

eoptasks/eoptasks.py

@@ -18,6 +18,18 @@
 #  [config]
 #  servergroups = /path/to/servergroups.yaml
 #  ignore = server1, server2
+#
+# Examples:
+#
+#  eoptasks -k test apt.upgrade
+#   Run (sudo) apt upgrade on all test servers.
+#
+#  eoptasks -k test,-database sudo apt install python-gadjo
+#   Run sudo apt install python-gadjo on all test servers except database servers.
+#
+#  eoptasks -k saas/test/passerelle,ext/test --list-servers
+#   List servers that have saas AND test AND passerelle keywords, OR the
+#   ext AND test keywords.
 
 import argparse
 import configparser