Added new post. Minor fixes.

Makefile

@@ -3,6 +3,7 @@
 # Copyright (c) 2017 Franco Masotti.
 # See LICENSE file for details.
 
+PORT = 3050
 all: build serve
 
 build:
@@ -12,7 +13,7 @@ serve:
 	@jekyll serve
 
 serve-global:
-	@jekyll serve --host=0.0.0.0
+	@jekyll serve --host=0.0.0.0 --port=$(PORT)
 
 clean:
 	@rm -rf _site

_posts/2018-03-02-algorithm.md

@@ -1,5 +1,5 @@
 ---
-title: An O(n) Python 3 algorithm that halves the number of characters to be removed.
+title: An O(n) Python 3 algorithm that halves the number of characters to be removed
 tags: [algorithm, string, python]
 updated: 2018-03-02 17:00
 description: A Python algorithm that halves the number of characters to be removed

_posts/2018-03-05-cups-simple-shared-printer.md

@@ -0,0 +1,65 @@
+---
+title: Add a remote shared printer with a couple of shell commands
+tags: [printer, CUPS, share]
+updated: 2018-03-05 13:00
+description: How to add a remote shared printer within CUPS using a couple of shell commands
+---
+
+If you happen to have a USB printer without WiFi and a computer that will
+act as server, then you can use [CUPS](https://www.cups.org/) to share it.
+
+Once you setup CUPS to allow non-localhost connections, on port 631, you can
+use the web interface for the configuration. At the time, I tried to add the
+printer from a client computer using the web interface and selecting the
+driver, just like I did on the server. I got a `Filter failed` error.
+Basically, I think that the problem was that the file got through the printer
+filters twice (see `$ man 7 filter`). To avoid this, the printer needs to be
+added as *raw* from a CLI shell:
+
+```shell
+local_printer_name="Printer"
+server_hostname="192.168.0.1"
+
+# This must be the exact same name
+# as the one reported on the server.
+remote_printer_name="Remote_printer"
+
+description="Remote printer"
+location="Connected to the server"
+
+lpadmin -p ${local_printer_name} -v \
+ipps://${server_hostname}:631/printers/${remote_printer_name} \
+-D "${description}" -L "${location}" -E
+```
+
+Please note that `lpadmin` needs root privileges.
+
+The only thing to do is to edit the variables appropriately and then do a printer test. 
+
+Recently I experienced encryption certificate problems using `ipps://` but
+everything worked fine using the plain `ipp://` protocol. If you are
+in a trusted network this shouldn't be a problem.
+
+You can now set the new printer as the default system one:
+
+```shell
+lpoptions -E -d ${local_printer_name}
+```
+
+Just like `lpadmin`, `lpoptions` also needs root privileges.
+
+In case you need to remove the printer you have to run the following:
+
+```shell
+lpadmin -r ${local_printer_name}
+```
+
+See `$ man 8 lpadmin` and `$ man 1 lpoptions` for all possible parameters.
+
+That's it...
+
+## Note
+
+This post is an adaptation of the original one at
+[linuxdifficile](https://linuxdifficile.wordpress.com/2016/03/02/aggiungere-una-stampante-remota-condivisa-da-un-sistema-gnulinux-con-un-solo-comando/)
+