for #23, add parallel processing

LICENSE

@@ -0,0 +1,23 @@
+MIT License
+
+Portions Copyright (c) 2018 Intellex
+Portions Copyright (c) 2020 Oliver Mueller
+Portions Copyright (c) 2020 Andrej Walilko
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,17 +1,17 @@
 # blcheck
 
-A powerful script for testing a domain or an IP against mailing black lists.
+A powerful script for testing a domain or an IP against mailing block lists and allow lists.
 Script will use dig if it is found. If dig is not found script will use host.
 
 
 Features
 --------------------
 
-* More then __100 black lists__ already included!
+* More then __280 block lists__ already included!
 * Automatic distinction between __domain or IP__
 * Performs __PTR validation__ (only if domain is supplied, does not work for IP)
 * 3 verbose (-v) levels and a quiet (-q) mode
-* The result of script is the number of servers which blacklisted the domain, so it can be used for any kind of __automated scripts or cronjobs__
+* The exit code of script is the number of servers which blocklisted the domain, so it can be used for any kind of __automated scripts or cronjobs__
 * Informative and pleasant output
 
 
@@ -32,50 +32,29 @@ If the IP is supplied, the PTR check cannot be executed and will be skipped.
 
 <pre>
 -d dnshost  Use host as DNS server to make lookups
--l file     Load blacklists from file, separated by space or new line
--c          Warn if the top level domain of the blacklist has expired
+-l file     Load blocklists from file, separated by space or new line
+-c          Warn if the top level domain of the blocklist has expired
 -v          Verbose mode, can be used multiple times (up to -vvv)
 -q          Quiet modem with absolutely no output (useful for scripts)
--p          Plain text output (no coloring, no interactive status)
+-p          Plain text output (no coloring, no interactive status, useful
+            for tee'd output to a text file)
+-j num	    The number of parallel processes to use (default is 200%, or
+	    2x system core count. See `man parallel` for details.)
 -h          The help you are just reading
 </pre>
 
-Result of the script is the number of blacklisted entries. So if the supplied
-IP is not blacklisted on any of the servers the result is 0.
+Exit code of the script is the number of blocklisted entries. So if the supplied
+IP is not blocklisted on any of the servers the exit code is 0.
 
 
 TODO
 --------------------
 1. Handle domains with multiple DNS entries.
 
-Licence
---------------------
-MIT License
-
-Copyright (c) 2018 Intellex
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-
 Credits
 --------------------
 Script has been written by the [Intellex](http://intellex.rs/en) team.
-Contributors:
+Additional contributors:
 	[Darko Poljak](https://github.com/darko-poljak)
-
-
+	[Oliver Mueller](https://github.com/ogmueller)
+	[Andrej Walilko](https://github.com/ch604)