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CSV=/path/to/raw.csv && python -c "import csv;r=csv.reader(open('$CSV','rb'), delimiter=',', quotechar='\"');print '\n'.join(['\t'.join(l) for l in r])"

#python3, stdin
cat キモい.csv|python -c "import csv;import sys;import io;r=csv.reader(io.TextIOWrapper(sys.stdin.buffer, encoding='utf-16'), delimiter='\t', quotechar='\"');print('\n'.join(['\t'.join(l) for l in r]))" 

#pythhon3, デリミタやエンコードも指定する場合
CSV=キモい.csv && python -c "import csv;r=csv.reader(open('$CSV','r',encoding='utf-16'), delimiter='\t', quotechar='\"');print('\n'.join(['\t'.join(l) for l in r]))"