extract sequences ID from a fasta file

Question

[Kurban]

i wanna extract all the sequences ID from a fasta file (Drosophila melanogaster chromatin remodeling factors).

fasta file content:

>FBpp0079251 FBgn0003607 symbol:Su(var)205 family:Chromatin Remodeling Factors species:Drosophila melanogaster
MGKKIDNPESSAKVSDAEEEEEEYAVEKIIDRRVRKGKVEYYLKWKGYPETENTWEPENN
LDCQDLIQQYEASRKDEEKSAASKKDRPSSSAKAKETQGRASSSTSTASKRKSEEPTAPS
GNKSKRTTDAEQDTIPVSGSTGFDRGLEAEKILGASDNNGRLTFLIQFKGVDQAEMVPSS
VANEKIPRMVIHFYEERLSWYSDNED
>FBpp0079496 FBgn0032157 symbol:Etl1 family:Chromatin Remodeling Factors species:Drosophila melanogaster
MSDSTVAASASASASSSAKSSLSDLRQFRINKNASSVVASPSRTERVPGKKRIQVMADSD
SDGNDSQTPKKTKLELTVKEKEERYMAAAKISPHFDTMAIQESLSRTNWDVAASVRYLRE
NCKPKGHNGPLAKSKLKPRSNGISGGNFSDNDHSDDDDVKQSKDQVYDSDDSDSEMSTKM
TGQRKKVFQFMNEASLIELQSVKTLSEKKALAIIDVRPFSDWSDLRQKLESIRMSGDLLN
YAQELINKQNTVAAILSKCNNMVSRLEKAISNGAGIVEQPKLLSSGLQLADYQIIGLNWL
TVMHKQEMNGILADEMGL

how can i extract all the IDs from the file in the Linux terminal(command)?

[poisonAlien]

 grep '^>' fasta_file.fa > seq_id.txt

[Neilfws]

That will extract the entire header line, not the ID.

[apelin20]

Well what is your expected output? What are the IDs?

[Kurban]

Thank you for the commend.

IDs in the texts above are the lines which contain '>' sight, e.g.:

>FBpp0079251 FBgn0003607 symbol:Su(var)205 family:Chromatin Remodeling Factors species:Drosophila melanogaster
>FBpp0079496 FBgn0032157 symbol:Etl1 family:Chromatin Remodeling Factors species:Drosophila melanogaster

You can say its the id of that gene or polypeptide.

[apelin20]

well then I have to agree with poisonAlien's solution. From what you told me you just want the fasta headers:

grep ">" fasta_file.fa | sed 's,>,,g' > seq_id.txt

[Neilfws]

Please search this site, similar questions have been asked and answered multiple times.

[poisonAlien]

Oops ! sorry. Should have read it carefully.