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sort needs somewhere to create work file(s) used during its processing, these are usually in /tmp or $TMPDIR, but the option is given to the user to select a 'scratch' area .... so, its optional

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

#fsck (or one of its variants should do the job)
man -k fsck