Batch fastq_to_fasta: how to append output file name?

[Opinel99]

This is all quite new to me so I apologize in advance:

I would like to have a script that will do a batch fastq_to_fasta conversion with seperate output files with appended names, e.g.:
X.fastq > X.fasta
Y.fastq > Y.fasta
Z.fastq > Z.fasta

There must be an easy way to do this but I just can't figure out the output...

[lh3]

ls *.fastq | sed s,q$,, | xargs -i echo seqtk seq -a {}q > {}a | sh

If you have GNU parallel installed:

ls *.fastq | sed s,q$,, | xargs -i echo seqtk seq -a {}q > {}a | parallel