Programming

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====== Linux Tools ======

===== fsz =====

  * https://github.com/junegunn/fzf

Herramienta de autocompletado, para moverte con más agilidad en la terminal.

Keybindings:
  * ctrl+r para buscar en el historial
  * ctrl+t para seleccionar ficheros. Por ejemplo: ''rm'' - ctrl+t - escoger ficheros con tab - enter

Luego también puedes:
<code>
cd ** <TAB>
ssh ** <TAB>
</code>


===== KeyLogger =====

  * https://github.com/kernc/logkeys
  * {{:wiki2:linux:logkeys-master.zip|LogKeys}}

<code>
$ logkeys --start -d /dev/input/event6 -m /home/alfred/Desktop/logkeys-master/keymaps/es_ES.map
</code>
<code>
--no-daemon
--no-func-keys
--output file
</code>

===== PDF merge =====
<code>
sudo snap install pdftk
pdftk file1.pdf file2.pdf cat output mergedfile.pdf
</code>
===== Enable, disable, and check the Ubuntu firewall =====
<code>
sudo ufw enable
sudo ufw disable
sudo ufw status
</code>
===== Limit downloading =====

<code>
sudo apt-get -y install wondershaper
sudo wondershaper <interface name> <down speed> <up speed>
sudo wondershaper eth0 512 512
sudo wondershaper clear <interface name>
</code>
Wondershaper seems to work on x10, so to limit to 512Kbps and 50Kbps would be:
<code>
sudo apt-get install trickle
sudo trickle -d 120 -u 32
</code>

===== Screen =====
<code>
screen ./unix-shell-script-to-be-executed parameters
screen -ls
screen -X -S [session # you want to kill] quit
</code>
===== Rclone =====
https://rclone.org/
<code>
cp rclone /usr/bin/
chown root:root /usr/bin/rclone
chmod 755 /usr/bin/rclone
mkdir -p /usr/local/share/man/man1
cp rclone.1 /usr/local/share/man/man1/
mandb 
</code>

An example for filtering: ''rclone sync path0 path1 -vv --filter-from filter_file.txt''
<code>
- .git/
- .gitignore
- tmp/**
- .svn/
- dist/*.tar
- dist/*.zip
- .idea/
- __pycache__/
- **.pyc
+ **/migrations/__init__.py
- **/migrations/**
+ **/static/**
- static/**
+ *
</code>
===== entr - Run a command when a file changes =====
<code>
$ ls | entr sass main.scss > ../main.css | echo "compile"
</code>

:!: I do not know why, but ''sass main.scss > ../main.css ; echo "compile"'' does not work.

===== MiniUPnP =====

Este paquete te permite llamar a los comandos UPnP de tu router y abrir puertos desde la máquina local:
<code>
upnpc -a <ip> <puerto> <puerto_router> <protocolo(TCP|UDP)>
upnpc -a 192.168.1.130 8000 8000 UPD
</code>

===== Snaps =====

List applications used by snap:
<code>
snap list
</code>

Paths used by snap:
<code>
~/snap
/snap
/var/snap
/var/lib/snapd
</code>
===== Configure a DNS server =====

To install it add the ''bind9'' package. All its configuration for the names is placed on the ''/etc/bind'' path.

You need to change the next file ''/etc/default/bind9'' to accept IP v4:
<code>
# run resolvconf?
RESOLVCONF=no
# startup options for the server
OPTIONS="-4 -u bind"
</code>

Add those IP's allowed to query DNS into the main config:
<code>
allow-query { localhost;192.168.1.0/24; };
</code>

:!: Examples will configure test.test, wiki.test.test...

After this, if we wanted to add an url name we should create a zone (into the config for zones):
<code>
zone "test.test" { 
     type master; 
     file "/etc/bind/db.test"; 
     allow-update { none; }; 
     allow-query {any; };
}; 
</code>

And in the file ''/etc/bind/db.test'':
<code>
$TTL	86400
@	IN	SOA	dns.test. root.test.test. (
			     3		; Serial
			 604800		; Refresh
			  86400		; Retry
			2419200		; Expire
			 604800 )	; Negative Cache TTL
;
@ IN NS dns.test.
wiki IN A 192.168.1.250
auth IN A 192.168.1.251
</code>

After this we can restart the service bind9.

Before restarting it we can execute some checks:
  * ''named-checkconf''
  * ''named-checkzone test.test db.test''

More doc:
  * https://help.ubuntu.com/community/BIND9ServerHowto
  * {{ :wiki2:linux:how_to_configure_bind_as_a_private_network_dns_server_on_ubuntu_18.04_digitalocean.pdf |}}
  * {{ :wiki2:linux:setting_up_bind_as_a_private_dns_server_on_rhel_8.pdf |}}

===== Pandoc =====

===== Tools list =====

  * [[https://stedolan.github.io/jq/|jq]], for making queries on json files.

==== Watchexec ====

  * https://crates.io/crates/watchexec

For executing a command when a file from a dir changes.

<code>
watchexec --exts py "printenv WATCHEXEC_META_CHANGED_PATH"
</code>
Programming

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