Exercise 2 on lab 7 done

Labb7/ovning2.sh

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+#!/bin/bash
+
+# Jack-Benny Persson
+# LX13
+# Exercise 2, lab 7 (Write script to create a dhcpd.conf)
+
+# Set some variables
+File="$HOME/dhcpd.conf"
+
+# Binaries
+Awk="/usr/bin/awk"
+Dialog="/usr/bin/dialog"
+Printf="/usr/bin/printf"
+
+# Sanity checks
+if [ ! -w `dirname $File` ]; then
+	echo "Can't write to `dirname $File`"
+	exit 2
+fi
+
+for bin in $Awk $Dialog $Printf; do
+	if [ ! -x $Bin ]; then
+		echo "Can't execute $Bin"
+		exit 2
+	fi
+done
+
+# Functions
+question()
+{
+	$Dialog --backtitle "Interactive DHCPD config generator" \
+	--inputbox "$1" 10 60 2> /tmp/dhcpd_question
+	if [ $? -ne 0 ]; then # Check if user hit ESC
+		echo "Aborting interactive DHCPD config generator"
+		exit 1
+	fi
+	Input=`cat /tmp/dhcpd_question`
+}
+
+# Ask all the questions
+question "Enter subnet and netmask, separate with a single whitespace"
+Subnet=$Input
+
+question "Enter IP range, seperate start and end with a single whitespace"
+Range=$Input
+
+question "Enter your network DNS servers, multiple servers can be entered"
+Nameservers=$Input
+
+question "Enter your default routers"
+Router=$Input
+
+$Dialog --backtitle "Interactive DHCPD config generator" \
+	--menu "Choose DDNS update style" 10 60 3 \
+	none "None" ad-hoc "Ad-Hoc" interim "Interim" 2> /tmp/dhcpd_question
+	Input=`cat /tmp/dhcpd_question`
+Style=$Input
+
+question "Enter default lease time in seconds"
+DefaultLease=$Input
+
+question "Enter max lease time in seconds"
+MaxLease=$Input
+
+# Generate dhcpd.conf
+Sub=`echo $Subnet | $Awk '{ print $1 }'`
+Netmask=`echo $Subnet | $Awk '{ print $2 }'`
+$Printf "subnet $Sub netmask $Netmask {\n" > $File
+$Printf "range ${Range};\n" >> $File
+$Printf "option domain-name-servers ${Nameservers};\n" >> $File
+$Printf "option routers ${Router};\n" >> $File
+$Printf "ddns-update-style ${Style};\n" >> $File
+$Printf "default-lease-time ${DefaultLease};\n" >> $File
+$Printf "max-lease-time ${MaxLease};\n" >> $File
+$Printf "}\n" >> $File
+
+exit 0
+