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Wget in python software#
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Wget in python code#
Redistributions of source code must retain the above copyright # modification, are permitted provided that the following conditions # Redistribution and use in source and binary forms, with or without The following script implements a scheme like this in relatively simple Python code: #!/usr/bin/env python While there are more jobs, spawn a new one every time a child exits.Spawn an initial set of N jobs (where N is the maximum number of parallel downloads).Build a list of “wget jobs” that have to be completed.Read a list of URLs from one or more files.The main parts of a script like this would be: As an experiment I tried writing a small process monitor in Python one that can act as a “download manager” by spawning multiple wget instances and keep spawning more instances as they finish their work. Spawning multiple child processes and watching them until they stop running is not a very difficult problem. This is precisely the idea behind download managers: programs that can be fed a list of URLs and fetch them in parallel. One of the ways to achieve better download speeds for multiple files is to use multiple parallel connections. Download speed with 1 wget job at a time. Indeed, while fetching large files from a remote server, my DSL connection at home could fetch only about 78 Kbytes/sec when I was running one wget instance at a time:įigure 1. The utilization of your connection will probably be less than optimal. The second file will start downloading only after the first one has finished. This small shell snippet will download the files one after the other, but it is a linear process. In a Bourne-compatible shell you can store the URLs of the remote files in a plain text file and then type: $ while read file do \ Fetching multiple files is also easy with a tiny bit of shell plumbing. When downloading a single file this works fine and will often be enough to do the job at hand easily, without a lot of fuss. The wget utility will start downloading the remote “ file” and save it in the current directory with the same name. You just have to type: $ wget -np -nd -c -r That’s all. Downloading a single file from a remote server is very easy. GNU wget is a very useful utility that can download files over HTTP, HTTPS and FTP.
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