Added a readme, and made the script not depend on a hardcoded install dir

README.md

@@ -0,0 +1,25 @@
+# Netmonitor - track routers, switches and clients on a network
+
+This script maps the active client devices in a network, by talking to 
+the router and switches. Each client is tracked by MAC address, VLAN and 
+network outlet.
+
+## Configuration
+
+ - `router.conf`
+   Contains the name or IP address of the router. Only one allowed.
+ - `secret.conf`
+   Contains the snmp secret used to authenticate with the router.
+ - `switches.conf`
+   Lists the names or IP addresses of switches to be monitored, 
+   one per line.
+ - `vlans.conf`
+   Lists the VLAN numbers to be monitored, one per line.
+
+When reading `switches.conf` and `vlans.conf`, the script ignores 
+everything after the first word on each line, so each item can be 
+commented:
+```
+some.switch.example  the switch under my desk
+another.switch.example the other one
+```

netmonitor.sh

@@ -1,9 +1,9 @@
 #!/bin/bash
 
 set -e
-cd /opt/netmonitor
+cd "$(dirname "$(readlink -f "$0")")"
 
-router="nod-gw1.su.se"
+router="$(cat ./router.conf)"
 switches="./switches.conf"
 vlans="./vlans.conf"
 logfolder="/var/log/netmonitor"

switches.conf

@@ -1,10 +0,0 @@
-nodhk06-p3-1.local.su.se
-nodhh01-p3-1.local.su.se
-nodhj01-p3-1.local.su.se
-nodhm01-p3-1.local.su.se
-nodhe01-p2-1.local.su.se
-nodhd01-p2-1.local.su.se
-nodhf01-p2-1.local.su.se
-nodhc01-p0-1.local.su.se
-nodhb01-p0-1.local.su.se
-nodhg01-p2-1.local.su.se

vlans.conf

@@ -1,5 +0,0 @@
-201	studentnät 177.*
-758	pi-nät svart
-401	servernät 161.*
-157	servernät 157.*
-158	personalnät 158.*