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script (lets call it filetype.sh):
for file in `ls`
do
file $file
done

Now:
sh filetype.sh > typeofeachfileindir.txt
sed -n -e 's/.*: \(.*\)/\1/p' typeofeachfileindir.txt | sort | uniq >...

cat cell | grep "CELL 2" > cell2
or
sed -n -e "/CELL 2/p" cell > cell2
or
awk '/CELL 2/{print $0}' cell > cell2

The only reasonable choice for your method would be generating ssh certificates for passwordless login with forced commands only (for security reasons). This would allow you tu run df -m on remote...