gnu parallel pipe sed - no input files error

Question

I am using the following sed script to perform some find and replace:

parallel --pipepart --block 1000M -a input.txt sed -ise 's/cat/dog/g; s/abc/xyz/g; s/def/22/g' > output.txt

But I am getting the following error:

sed: no input files

I tried removing the -i option but the outcome is still the same.

input.txt file contains a combination of alphabets and numbers and contains around 30 million lines

user_363028 · Answer

You need -q:

parallel -q --pipepart --block 1000M -a input.txt sed -se 's/cat/dog/g; s/abc/xyz/g; s/def/22/g' > output.txt

To understand why:

Also --block -1 --lb may be more efficient than --block 1000M.