I have used the following a guide with these commands:
echo "accession\taccession.version\ttaxid\tgi" > reference_proteomes.taxid_map
zcat */*/*.idmapping.gz | grep "NCBI_TaxID" | awk '{print $1 "\t" $1 "\t" $3 "\t" 0}' >> reference_proteomes.taxid_map
I used echo "accession\taccession.version\ttaxid\tgi" > reference_proteomes.taxid_map & zcat *.idmapping.gz | grep "NCBI_TaxID" | awk '{print $1 "\t" $1 "\t" $3 "\t" 0}' >> reference_proteomes.taxid_map
but I received the messaged that the argument list is too long:/usr/bin/zcat: Argument list too long
so I have tried xargs in this: find /Volumes/My\ Passport\ for\ Mac/uniprot | xargs zcat *.idmapping.gz | grep "NCBI_TaxID" | awk '{print $1 "\t" $1 "\t" $3 "\t" 0}' >> reference_proteomes.taxid_map
but still received the long list argument message -bash: /usr/bin/xargs: Argument list too long, any suggestion?