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Is this complicated for you or not?
for file in file*
do
sed -i "1 s/^/`wc -l $file`\n/" $file
done

here's one way .....

for file in *.x; do
wc -c $file | awk '{printf("%ld,%s\n",$1,$2)}' > ${file}.temp && cat ${file} >> ${file}.temp && mv ${file}.temp ${file};
done

#!/bin/sh

for i in filelist*
do
NUMCHAR=`cat $i | wc -c`
echo "ABC,$NUMCHAR" >${i}.new
cat $i >>${i}.new
done


Video tutorial on how to use code tags in The UNIX and Linux...