Exercise 4 on lab 8 done

Labb8/ovning4.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+# Jack-Benny Persson
+# LX13
+# Exercise 4 on lab 8 (Write a script that sends a report to the sysadmin
+# about the 5 biggest homefolders on the system
+
+# Binaries
+Sed="/bin/sed"
+Awk="/usr/bin/awk"
+Du="/usr/bin/du"
+Mktemp="/bin/mktemp"
+Mail="/usr/bin/mail"
+Printf="/usr/bin/printf"
+Rm="/bin/rm"
+
+# Variables
+Admin="jake"
+
+# Sanity checks
+for Bin in $Sed $Awk $Du $Mktemp $Mail $Printf $Rm; do
+	if [ ! -x $Bin ]; then
+		echo "Can't execute $Bin"
+		exit 1
+	fi
+done
+
+if [ ! -w /tmp/ ]; then
+	echo "Can't create temporary files, aborting"
+	exit 1
+fi
+
+
+# Main
+
+# Create a temporary file
+File=`$Mktemp -t homeusage.XXXXXX`
+
+# Redirect all output to the temporary file
+exec 1> $File
+
+# Create the mail content
+$Printf "Home folder usage report (the top 5 users)\n\n"
+$Printf "Usage   \tUser\n"
+$Printf "-----   \t----\n"
+$Du -sm /home/* | sort -r | sed -n '1,5p' | awk '{ print $1 " Mbyte   \t" $2 }'
+
+# And finaly send it to it's recipient
+$Mail $Admin -s "User usage report" < $File
+
+# Clean up
+$Rm $File
+
+exit 0