Get Protein Sequences fasta file by using Entrez Gene Ids

[kurban910]

I want to get a protein sequences FASTA file for a given list of Entrez Gene IDs, which is shown as blow:

kurban@kurban-X550VC:~/Desktop$ more Triboliumcastaneum_tf_id.txt
100141790
100142111
100142176
100142203
100142308
654967
655070
655772
655998

how could i extract their corresponding protein sequences fasta file for these Tribolium castaneum gene id from ncbi? thanks.

[Richard Finney]

Here's a hint:

Use the efetch utilty :
example for mrna:
wget "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=nuccore&id=100141790,100142111,100142176,100142203,100142308,654967,655070,655772,655998&rettype=fasta&retmode=text" -O out

Getting the protein is the hard part.

Full solution
echo -e "100141790\n100142111\n100142176\n100142203\n100142308\n654967\n655070\n655772\n655998" | while read G; do curl -s "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=gene&db=protein&id=${G}" | grep -A 1 "<Link>" | grep "<Id>" | cut -d '>' -f 2 | cut -d '<' -f 1 | while read S ; do curl -s "http://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=protein&id=${S}&retmode=text&rettype=fasta" ; done; done


from Pierre Lindenbaum's post at biostars:
https://www.biostars.org/p/52652/

Note there are multiple isoforms

[kurban910]

thanks @Richard,
the commend really works like a charm, but the total sequences i wanna extract are 519, so how could i change my file formation

100141790
100142111
100142176
100142203
100142308
654967
655070
655772
655998

to this form: "100141790\n100142111\n100142176\n100142203\n100142308\n654967\n655070\n655772\n655998"?

sorry , i am now at this.