From 69d767ddc5b43de1420d3f16df53611edd5efd92 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eirik=20Svag=C3=A5rd?= <eirik@readflow.io>
Date: Mon, 23 Mar 2020 11:14:49 +0100
Subject: [PATCH] More arduino and housecleaning

---
 linux.md | 51 +++++++++++++++++++++++++++++----------------------
 1 file changed, 29 insertions(+), 22 deletions(-)

diff --git a/linux.md b/linux.md
index 08d93ac..e5424aa 100644
--- a/linux.md
+++ b/linux.md
@@ -1,26 +1,17 @@
 # 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>
 
-## Arduino
-Find what 'channel'(?) the Arduino is plugged in at:
-`dmesg | grep tty`
-
-Do following commands to "talk" with an Arduino (with a set script):
-> python    
-> import serial     
-> ser = serial.Serial('/dev/ttyACM0',115200)    
-> ser.readline()    
-> ser.write("PP\n")
-
----
 ## SSH
 Copy files to/from an SSH connection: (SSH format: `user@host:/path` )
 > `scp <source> <destination>`
@@ -28,7 +19,8 @@ Copy files to/from an SSH connection: (SSH format: `user@host:/path` )
 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>`
@@ -36,7 +28,7 @@ Create groups
 Add user to a group
 > `usermod -a -G <group> <user>`
 
-## Open ports with iptables
+### 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.
 
@@ -47,17 +39,32 @@ 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>
 
-> [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
+### 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:
+`dmesg | grep tty`
+
+Do following commands to "talk" with an Arduino (with a set script):
+> python    
+> import serial
+> ser = serial.Serial('/dev/ttyACM0',115200)    
+> ser.readline()    
+> ser.write("PP\n")
+
+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()`