This is an old thread but this answer may prove useful to others, I had a similar problem with a command similar to

zcat -c test.gz | pythonscript.py > test.out

being called within a makefile, it had the same error as mentioned in this thread. I ended up changing it to

cat test.gz | zcat -c | pythonscript.py > test.out

Regards Brad

In reply to Re^2: dynamic zcat and grep by Anonymous Monk
in thread dynamic zcat and grep by clmcshque

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