change fastq header

Question

[reza]

i have a fastq file that have headers like "@HWI-ST916:209:XXXX:2:1101:1104:1915 1:N:0:", Now i want to convert them like "@HWI-ST916:209:XXXX:2:1101:1104:1915/1"

how can i do it?

thanks in advance

Answer 1

[Sej Modha]

You could use sed:

sed 's/ 1:N:0:/\/1/g' inputfile

Answer 2

[Pierre Lindenbaum]

cut -d ' ' -f 1 input.fastq