get_column_names.py $filename | grep -i coupon | \ python -c "import sys; print(','.join(line.strip() for line in sys.stdin))"
import fileinput print("".join(sorted(fileinput.input(), key=len)))
On the command line:
% cat random_snippets.txt | python -c 'import fileinput; print("".join(sorted(fileinput.input(), key=len)))'
Ref:- https://stackoverflow.com/questions/34401683/how-to-use-awk-to-sort-lines-by-length/
See also:
cat junk3.txt | \ python -c "import sys; print('\'', '\', \''.join(line.strip() for line in sys.stdin), '\'', sep='')"