Fasta file display and edition

Question

[M.Nadeem Khan]

Dear all. I have a large file almost 1.2 GB, having fasta sequence of different samples. I want to extract sequences sample-wise. I faced problems in its opening. EmEditor did it well. Let me know if there any software or tool which can do it. because doing manually it takes too much (in days even)?

[guillaume.rbt]

You may find your answer on one on those previous questions :

Split the multiple sequences file into a separate files

How To Split A Multiple Fasta

how to convert a long fasta-file into many separate single fasta sequences

Splitting A Fasta File

[WouterDeCoster]

I want to extract sequences sample-wise. I faced problems in its opening.

Manual editing in a text editor is a bad idea. You might introduce errors, and whatever you do is not reproducible.
It is unclear what exactly you want to do with the fasta file though.