Shell Programming and Scripting

#!/bin/bash

clear; #clear the screen

#usage function
function usage() {
	echo '
         No Options selected.
         usage: sysinfo [-u -s -r]

         -u User Information
         -s System Information
         -r Generate Report
'
}

function home_files() {
	printf "contains: \t%s regular file(s), %s hidden\n" `ls -l $HOME | grep -E '^-' | wc -l` `ls -Al $HOME | awk ' /^-/{ print $8 }'  | grep "^\." |wc -l` #display count of regular files not hidden and hidden
	printf "\t\t%s directorie(s), %s hidden\n" `ls -l $HOME | grep -E '^d' | wc -l` `ls -Al $HOME | awk ' /^d/{ print $8 }'  | grep "^\." |wc -l` #display count of directory files not hidden and hidden
	printf "\t\t%s other type(s), %s hidden\n" `ls -Al $HOME | grep -E ^[^td-] | wc -l` `ls -Al $HOME | awk ' /^[^td-]/{ print $8 }'  | grep "^\." |wc -l` #display count of any special files not hidden and hidden

}

#check if any arguments was giving
if [ $# -lt 1 ] ; then
	usage;
	exit 1;
fi

#display user information
function user_information() {
	printf "****** User Information ********\n" # display user information header
      	printf "Username:\t%s\n" `whoami` # display current user name
	printf "User ID:\t%s\n" `id -g` # display current user ID number
	printf "size:\t\t%s\n" `du -sh $HOME | awk ' { print $1 } ' ` # display home directory size
	printf "Home directory:\t%s\n" `echo $HOME` # display home directory
	home_files #display a list of home file information
	printf "Default shell:\t%s\n\n" `echo $SHELL` # display default shell
}

#display system information
function system_information() {
	printf "******** System Information ********\n" # display system information header
	printf "Hostname: \t\t %s\n" `hostname` # display host name
	printf "Uptime: \t\t %s\n" `uptime | awk ' { print $3 } ' | tr , ' '` # display the time that the system been up and running
	printf "Local filesystems: \t %s mounted\n" `mount | grep ^/dev | wc -l` # display local mounted hard drives
	printf "Filesystem \t\t Mount Point \t\t Size \t\t Free Space\n" # display header for hard drive informations
	df -h | grep ^/dev | awk ' { printf "%s \t\t %s \t\t\t %s \t\t %s\n", $1, $6, $2, $4 } ' # display hard drive information
	free -m | grep -i ^mem | awk ' { printf "Memory: \t\t %sM Total \t %sM Free\n", $2, $4  } ' # display memory information
	free -m | grep -i ^swap | awk ' { printf "Swap: \t\t\t %sM Total \t %sM Free\n\n", $2, $4  } ' # display swap memory information
}

#generate user and system information report
function generate_report() {
	directory="$1" #holds directory argument giving to function
	save_point="$directory/SYSINFO_REPORT"
	if [ $directory -w ] #if the directory exist and is writable build report
	then
		echo "Creating report $save_point...." # Display creating report
		user_information > "$save_point" # write user information to report
		system_information >> "$save_point" # append system information to report
		echo "Report Complete" # display report is complete
	else
		echo "Error: $directory does not exist or not writeable" # display error message is the directory does not exisit or is not writeable
		#repeat loop if giving invalid directory or if the direction is not writeable		
		while ! [ $directory -w	] 
		do
			echo "Enter in an existing directory to create a report" #ask user to enter in a existing directory
			read "$directory" #read the directory from standard input from user
			if [ "$directory" -w ] #check if it the directory giving is writeable and does exists if true generate the report
			then
				save_point="$directory/SYSINFO_REPORT"
				echo "Creating report $save_point...." # Display creating report
				user_information > "$save_point" # write user information to report
				system_information >> "$save_point" # append system information to report
		echo "Report Complete" # display report is complete
			fi
		done
	fi 
}
echo $1
#loop through arguments
while getopts "usr:" OPTION; do
case "$OPTION" in
    u)
	user_information
        ;;
    s)
	system_information
        ;;
    r)
	generate_report $OPTARG    
	;;
    ?)
        usage;; #if a invalid agurment is giving display usage
esac
done

[ $directory -w ]

[ -w "$directory" ]