rhbz#836292
Thanks to: Dave Allan
as part of a cron command.
.PP
Blank lines, leading spaces, and tabs are ignored. Lines whose first
-non-white space character is a pound-sign (#) are comments, and are note processed.
+non-white space character is a pound-sign (#) are comments, and are not processed.
Note that comments are not allowed on the same line as cron commands, since
they are considered a part of the command. Similarly, comments are not
allowed on the same line as environment variable settings.