HI,
I figured out the way to make the regular changes to the URLs, I am giving a set of URLs which are actually in an array. I guess i can use  foreach $url (@urls) {} to get each URL. But i need to save the output in a file, such that each download is appended to the same file, so at the end of the run, i have a single file, which I can manipulate! Is is possible.
I have gone through the POD doccumentation for the LWP::UserAgent and LWP::Simple, but not being a trained programmer, I really couldnt make a lot of sense out of it. Below is the set of URLs that i generated 
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_021973.16&from=1
+428112&to=1428312&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_006713.13&from=1
+7592746&to=17592946&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_033899.6&from=30
+911489&to=30911689&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_008183.17&from=5
+688508&to=5688708&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_008413.16&from=1
+2431428&to=12431628&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_010194.16&from=4
+0748608&to=40748808&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_011512.9&from=24
+538334&to=24538534&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_008583.16&from=2
+0870594&to=20870794&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_007933.13&from=4
+3842762&to=43842962&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_004836.15&from=1
+0944910&to=10945110&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_007592.13&from=5
+267636&to=5267836&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_026446.12&from=1
+605346&to=1605546&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_028413.7&from=42
+4829&to=425029&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_011109.15&from=4
+075427&to=4075627&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_005058.14&from=1
+6657433&to=16657633&txt=on&view=gb
http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=NT_033899.6&from=39
+71767&to=3971967&txt=on&view=gb

[download]
Thanks in advance for your help
Sameet

In reply to Re: Re: Re: Re: Selecting Random Sequence by Sameet
in thread Selecting Random Sequence by Sameet

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.