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| pigz -d -c in.fastq.gz | | |
| | awk 'BEGIN {LN=0; } { if (LN == 1 || LN == 3) { print substr($0, 0, 26) } else { print $0 } ; if (LN == 3) { LN = 0 } else { LN++ } }' \ | |
| | pigz -c - > out.fastq.gz |
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