#!/bin/bash
#MAC.sh Capture the service tag and MAC address to a file
clear
infile=/media/removable/data.txt		#Sets data.txt as the source data file
outfile=/media/removable/MAC.csv		#Sets MAC.csv as the destination data file
dump_vpd_log --full --stdout > $infile 		#Writes system summary to data.txt
ifconfig wlan0 >> $infile 			#Appends WIFI info to data.txt
awk 'match($0, /service_tag/) {			#Finds the service tag and assigns it to variable serial
serial=substr($0,RSTART+RLENGTH+3,7)
print $serial","
}
;
match($0, /Ethernet  HWaddr/) {			#Finds the MAC address and assigns it to variable MAC
MAC=substr($0,RSTART+RLENGTH+1,17)
print $MAC\n
}
' $infile >> $outfile				#Uses data.txt as the AWK input and outputs the AWK results to MAC.CSV
umount /dev/sdb1				#Unmounts the USB flashdrive
eject /dev/sdb1					#Safely ejects the USB flashdrive
crossystem disable_dev_request=1; reboot	#Removes the ChromeBook from developer mode and reboots the system

index(in, find)
    This searches the string in for the first occurrence of the string find,
    and returns the position in characters where that occurrence begins in the string in.

# Contrived code, untested, may contain syntax errors
Pstart=index(haystack,needle1)
Pend=index(haystack,needle2)
InterestingString=substr(haystack,Pstart,Pend-Pstart+1)

#!/bin/bash
# MAC.sh Capture the service tag and MAC address to a CSV file named MAC.csv
#Clears the terminal screen
clear
#Erases all variables before starting
servicetag=''
mac=''
infile=''
outfile=''
size=''
#Sets MAC.txt as the source data file
infile=/media/ubuntu/Win7/Dell/MAC.txt
#Sets MAC.csv as the destination data file
outfile=/media/ubuntu/Win7/Dell/MAC.csv
#Writes system summary to MAC.txt
# dump_vpd_log --full --stdout > $infile
#Appends BIOS read serial number to MAC.txt
dmidecode -s system-serial-number >> $infile
#Finds the BIOS detected serial number and assigns it to variable servicetag3
servicetag3=$(dmidecode -s system-serial-number)
#Finds the Linux detected MAC address and assigns it to variable mac3
mac3=$(cat /sys/class/net/eth0/address)
mac3=$(echo $mac3 | tr '[:lower:]' '[:upper:]')
#Appends WIFI info to data.txt
# ifconfig wlan0 >> $infile
#Finds the service tag and assigns it to variable servicetag
servicetag=$(awk 'match($0,/service_tag/) {servicetag2=substr($0,RSTART+RLENGTH+3,7); print servicetag2}' $infile)
#Finds the MAC address and assigns it to variable mac
mac=$(awk 'match($0,/Ethernet  HWaddr/) {mac2=substr($0,RSTART+RLENGTH+1,17); print mac2}' $infile)
#Shows the service tag and WiFi MAC address			
echo "Service Tag 3 is" $servicetag3" and MAC 3 is" $mac3". The service tag is" $servicetag". The WiFi MAC is" $mac". The following has been written to MAC.csv: "$servicetag","$mac "\n The ChromeBook will exit developer mode and reboot in 10 seconds. Do not turn off the computer, please wait."
#Checks if MAC.csv exists, if not, creates file and writes spreadsheet headers
[ -f $outfile ] || echo "Service Tag,WiFi MAC Address" > $outfile
#Checks actual size of MAC.csv
size=$(du -b "$outfile" | cut -f 1)
#Checks if MAC.csv is greater than 5 bytes, if not, writes spreadsheet headers
[ $size -gt 5 ] || echo "Service Tag,WiFi MAC Address" >> $outfile
#Writes the service tag and WiFi MAC address to MAC.csv
echo $servicetag","$mac >> $outfile
#Unmounts the USB flashdrive
# umount /dev/sdb1
#Safely ejects the USB flashdrive
# eject /dev/sdb1
#Removes the ChromeBook from developer mode and reboots the system
#Pauses for 10 seconds before continuing
sleep 10
echo "Rebooting now!"
# crossystem disable_dev_request=1; reboot