It seems to work for me.

Download my code and save it as a file named 847578.pl. Then download your data and save it in a file named fasta.txt. Then execute this at your command line: 

perl ./847578.pl fasta.txt p.txt s.txt

[download]

I get 2 output files. This is the contents of file p.txt: 

>CVSF10000.x1 bg|356789 pair:789860
ATGCGTAGCTGATGTGCTGCTGATGCTAGTCGTCGTAGCTGATGCATGCTGATCGTAGTGCTCGATGCTA
GTCGTAGTCGTAGTCGTAGCGACTGATGCGATCGTAGTCGGATGATGCTGACTGATGCTGATCTGTACGT
CGTAGCTGATGCATGCGCTAGTAGCT
>CVSF10000.y1 bg|356790 pair:789859
GCTAGTCGATGCTGATGCTGTAGCTAGCGTAGTCGTACGCGCGCGCGCGCGTTTTTTGTGACGTCGTAGT
CCGTAGCTGATGCGATGCTAGTGCTGTGTCAGCTGATGTCGTGTGTAGCTGATGCTGATCGTTCGTGTGT
CGATGCTGATGCTAGTCGTAGTGTAT
>CVSF10001.x1 bg|356791 pair:789862
AGTCGTAGTCGTAGCTGTAGCTGATGCTGTGTACGATGCTGATGCGATGCGTAGCGTAGCATCGATGCTA
CGACTAGTCGTAGTCGTC
>CVSF10001.y1 bg|356792 pair:789861
CGTAGCTGATGCTGATCGTAGTCGTAGTCGATGCGATGCTAGTCGTAGCTGTAGCTGATGCTGCGTGCTG
CAGTCGATGCTAGTCGATGCTGATCGTCTAGCAT

[download]

This is the contents of file s.txt: 

>CVSF43565.d1 bg|346278
CAGACACACTTCTTTTAGTTGAGACACATGGAAAACATCATGTATGGCAGACAACTGTTCTGGGAGTTGG
ATCCGGGTAAGCAACGGGTCCACATATCTCCACAATCTCATAAGGGGCCAACATAGCGGGGGAGCTAACT
TGCCTTTGATTCCAAACCGTTGCACTCCTTTGGTCGGGGAAACTCGAAGGTACACATGATCACCAAGGTC
GAACTGCAGGGGTCTTCTCCGCTGGTCGGAGTAGCTCTTCTGTCAAGATTGGGCGGCCTTGAGATGTGCT
TGAATTACCTTCACTTGCTCTTCGGCTTCTGCCACTTAAGTCAGGGCCATAGACCTGTCTCTCCCCTGGG
CAGACACACTTCTTTTAGTTGAGACACATGGAAAACATCATGTATGGCAGACAACTGTTCTGGGAGTTGG
ATCCGGGTAAGC
>CVSF43566.d1 bg|346279
CAGACACACTTCTTTTAGTTGAGACACATGGAAAACATCATGTATGGCAGACAACTGTTCTGGGAGTTGG
ATCCGGGTAAGCCAGACACACTTCTTTTAGTTGAGACACATGGAAAACATCATGTATGGCAGACAACTGT
TCTGGGAGTTGGAATGCTAGTCGATCGCCAGACACACTTCTTTTAGTTGAGACACATGGAAAACATCATG
TTGGCAGACAACTGTTCTGGGAGTTGGATCCGGGTAAGCCAGACACACTTCTTTTAGTTGAGACACATGG
AAAACATCATGTATGGCAGACAACTGTTCTGGGAGTTGGATCCGGGTAAGC
>CVSF43567.d1 bg|346280
CGTAGCTGATGCTGTGCTGTTGTGTCGGGGGGATATATATATATATATGGGGTCGTAGTCGTAGCGCTAG
TATGCTAGCAGCGTAGATGCTGATCGATGCTGATGCTGATCGTAGTCGTAGGCTAGTGCGATCGTAGTCG
TAGTCGATGCTGATGCGTAGCTGATGTGCTGCTGATGCTAGTCGTCGTAGCTGATGCATGCTGATCGTAG
TGCTCGATGCTAGTCGTAGTCGTAGTCGTAGCGACTGATGCGATCGTAGTCGGATGCTAGCACGTAGCTG
GCTCGATGCTGATGCTGAT

[download]

In reply to Re^3: Print the data following few specific lines in perl by toolic
in thread Print the data following few specific lines in perl by ad23

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.