„etc/rc.local“ ändern

Update der /etc/hosts und hostname im.

etc/rc.local

@@ -31,13 +31,37 @@ fi
 #ip a s wlan1 2&>1 /dev/null || 
 #Check einbauen der aktive Verbindung prüft
 if [ -d /home/pi ]; then
-	echo pi$(cat /sys/class/net/wlan0/address | sed '/://g') > /tmp/hostname && hostname --file /tmp/hostname
+	echo pi$(cat /sys/class/net/wlan0/address | sed s'/://g') > /tmp/hostname && hostname --file /tmp/hostname
 else
-	echo thin$(cat /sys/class/net/wlan0/address | sed '/://g') > /tmp/hostname && hostname --file /tmp/hostname
+	echo thin$(cat /sys/class/net/wlan0/address | sed s'/://g') > /tmp/hostname && hostname --file /tmp/hostname
+fi
+
+cp /tmp/hostname /etc/hostname
+
+# insert/update hosts entry
+ip_address="127.0.2.1"
+host_name=$(cat /tmp/hostname)
+# find existing instances in the host file and save the line numbers
+matches_in_hosts="$(grep -n $host_name /etc/hosts | cut -f1 -d:)"
+host_entry="${ip_address} ${host_name} ${host_name}.lebenshilfe.local"
+
+echo "Please enter your password if requested."
+
+if [ ! -z "$matches_in_hosts" ]
+then
+    echo "Updating existing hosts entry."
+    # iterate over the line numbers on which matches were found
+    while read -r line_number; do
+        # replace the text of each line with the desired host entry
+        sudo sed -i '' "${line_number}s/.*/${host_entry} /" /etc/hosts
+    done <<< "$matches_in_hosts"
+else
+    echo "Adding new hosts entry."
+    echo "$host_entry" | sudo tee -a /etc/hosts > /dev/null
 fi
 
 #Fuer eth0, wenn kein WLAN vorhanden ist. Kann dann auskommentiert werden. 
-#echo rpi$(cat /sys/class/net/eth0/address | sed '/://g') > /tmp/hostname && hostname --file /tmp/hostname
+#echo rpi$(cat /sys/class/net/eth0/address | sed s'/://g') > /tmp/hostname && hostname --file /tmp/hostname
 
 # set network