Can you rectify problem in the following script ??

MYPATH="/clocal/Sanjay/"
MAIL_RECIPIENTS="abcx@zzz.com"
Subject="File accessed in last few minutes are ::"
>tempmail.txt
>tempfind.txt

## List all the files which one accessed since last 1 min #####

for file_dir in `find $MYPATH -amin -1`
do
### Find out the PID for that files which one been accessed
pid = ''
fuser -f "$file_dir" > tempfind.txt
pid = cat tempfind.txt | tr -dc "[:digit:]\n"
echo "$pid"

### Find out the owner/user name for that Process
### Replace the $access_user_filed with the filed no from the ps -ef
### command
user = `ps -ef | grep -w "$pid" | awk '{ print $1 }'`
echo " $file_dir access by the $user " >> tempmail.txt
done

cat tempmail.txt | mailx -s "$Subject" "$MAIL_RECIPIENTS"
---------------------------------------------------------------------

Once red faced commands will run successfully, means task is achieved.
Now, in variable pid, i am not getting any thing. I want the process no. related to the file accessed, using fuser command. As shown above.

Any help will be appreciable. !!