More arduino and housecleaning

linux.md

@@ -1,13 +1,57 @@
 # Linux Cheats
 
-## Set script as startup
+## General (tested in Debian)
+
+### Set script as startup
 If, for some reason, apache isn't startup:
 
 > `sudo update-rc.d apache2 defaults`
 
-## Check a package version/info
+### Check a package version/info
 > `dpkg -l matrix-synapse`
 
+<br>
+
+## SSH
+Copy files to/from an SSH connection: (SSH format: `user@host:/path` )
+> `scp <source> <destination>`
+
+Recursivly give directories execute privileges: (`-type f` for files instead)
+> `find /path/to/base/dir -type d -exec chmod +c {} +`
+
+<br>
+
+## GROUPS
+Create groups
+> `groupadd <groupName>`
+
+Add user to a group
+> `usermod -a -G <group> <user>`
+
+### Open ports with iptables
+
+Don't do that. Use [UFW](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-debian-10) instead.
+
+Allow a connection with UFW:
+> `sudo ufw allow <port/service>`
+
+Enable ufw service:
+
+> `sudo ufw enable`
+
++ [Source](https://www.linuxquestions.org/questions/linux-security-4/how-to-open-ports-with-iptables-237939/)
++ [Source2](https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands)
+
+<br>
+
+### Partitions
+The following command is not permanent:
+> `mount /dev/sda11 /opt`
+
+To mount partition permanently, instert the following into `/etc/fstab`:
+> `UUID=03ec5dd3-45c0-4f95-a363-61ff321a09ff /opt ext4 defaults 0 2`
+
+<br>
 
 ## Arduino
 Find what 'channel'(?) the Arduino is plugged in at:
@@ -20,44 +64,7 @@ Do following commands to "talk" with an Arduino (with a set script):
 > ser.readline()    
 > ser.write("PP\n")
 
----
-## SSH
-Copy files to/from an SSH connection: (SSH format: `user@host:/path` )
-> `scp <source> <destination>`
-
-Recursivly give directories execute privileges: (`-type f` for files instead)
-> `find /path/to/base/dir -type d -exec chmod +c {} +`
-
----
-## GROUPS
-Create groups
-> `groupadd <groupName>`
-
-Add user to a group
-> `usermod -a -G <group> <user>`
-
-## Open ports with iptables
-
-Don't do that. Use [UFW](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-debian-10) instead.
-
-Allow a connection with UFW:
-> `sudo ufw allow <port/service>`
-
-Enable ufw service:
-
-> `sudo ufw enable`
-
-
-
-> [Source](https://www.linuxquestions.org/questions/linux-security-4/how-to-open-ports-with-iptables-237939/)
->
-> [Source2](https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands)
-
-
-## Partitions
-The following command is not permanent:
-> `mount /dev/sda11 /opt`
-
-To mount partition permanently, instert the following into `/etc/fstab`:
-> `UUID=03ec5dd3-45c0-4f95-a363-61ff321a09ff /opt ext4 defaults 0 2`
-
+To set the time of current clock-program, continue with:
+> `from datetime import datetime`
+> `ser.write("T"+datetime.now().strftime("%y%m%d0%w%H%M%S")+"\n")`
+> `ser.readline()`