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TMP="$$.FILE"
#Process puts contents into TMP
cat "$TMP" | sort | head > "$TMP"
I already made sure the file was not empty to begin with. Without the > "$TMP", it outputs something, but when its stored again into the same file, its empty. What might be the cause?
Those processes all get run in parallel, so the head command is truncating the file before cat has a chance to read it.
To get the result you want, you need to write the sort output to a different file then move that over the original.