in reply to Selecting Random Sequence

It's a bit hard to help you since you don't give details on what URLs are needed to fetch the parts of human genome, but I think LWP::Simple and LWP::UserAgent should help you with that.

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Re: Re: Selecting Random Sequence
by Sameet (Beadle) on Apr 23, 2004 at 12:51 UTC
    using LWP::Simple and LWP::UserAgent, is fine, but the URL changes with each chromosme and the region of each chromosome! Is there a way around
[reply]
      The changes in the URL are most likely somewhat regular. If you can figure out the rule, adjusting the script as needed to transform the random number into the URL.

      But since you didn't post any examples, it's a bit hard for us to help you.

[reply]
        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
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