Store command output into variable

I am new to bash scripting and linux. I have a bash script that I have been working on that will take a path to a dd disk image file and pass it into fdisk to parse out some information. The issue that I am having is after I use sed to get the text that I want, I can't figure out how to save it into a variable. Instead I just keep getting an error:

 "/bin/timeline: line 49: /media/USB: No such file or directory"

This error appears to originate from the line where I set the temp variable:

temp=`$line|sed "s/.*\.001p[[:digit:]][^[:digit:]]\{0,\}\([[:digit:]]\{1,\}\).*/\1/"`

I have tried surrounding the command in bacticks like above and with $() but I still get the same error message. Below is what the output looks like from running the command:

[root@SIFTWorkstation /]# timeline /media/USB\ 500GB/Images/6RX99BCP/6RX99BCP.001
-------------------------------------------
/media/USB 500GB/Images/6RX99BCP/6RX99BCP.001p1   *          63   109980989    54990463+   7  HPFS/NTFS
-------------------------------------------
63
/bin/timeline: line 49: /media/USB: No such file or directory
count = 1
-------------------------------------------
/media/USB 500GB/Images/6RX99BCP/6RX99BCP.001p2       109980990   156296384    23157697+   7  HPFS/NTFS
-------------------------------------------
109980990
/bin/timeline: line 49: /media/USB: No such file or directory
count = 2
partition_offsets[0] = 1
temp =
[root@SIFTWorkstation /]#

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#!/bin/bash
 
#Check that there is one argument passed in
 
if [ $# -ne 1 ]
then
	echo "Usage: $(basename "$0") path"
	echo "  path: path to the image file"	
	exit 1
fi
 
 
 
#Check that the image file exists
 
if [ ! -f "$1" ]
then
	echo "File: "$1" does not exist"
	exit 1
fi
 
 
 
#Grab the basename of the file
 
filename=$(basename "$1")
#echo "Filename: $filename"
 
 
 
#Store the file name without the extension as the case name
 
casenum=`echo $filename | sed "s/\..*//"`
#echo "Case number = $casenum"
 
 
 
#Get the details about the disk image
 
declare -a partition_offsets
partition_offsets[0]=1
count=0
fdisk -ul "$1" 2>/dev/null | grep "6RX99BCP\.001p" | while read line
do
	echo "-------------------------------------------"
	echo "$line"
	echo "-------------------------------------------"
	echo $line | sed "s/.*\.001p[[:digit:]][^[:digit:]]\{0,\}\([[:digit:]]\{1,\}\).*/\1/"
	temp=`$line|sed "s/.*\.001p[[:digit:]][^[:digit:]]\{0,\}\([[:digit:]]\{1,\}\).*/\1/"`
	count=$[$count + 1]
	echo "count = $count"
done
 
echo -n "partition_offsets[0] = "
echo ${partition_offsets[0]}
echo "temp = $temp"