I am working with WRF model to forecast weather. I need to download GFS Data at a periodic interval during runtime of WRF. I am new to both LINUX and WRF. I need a script which could do the above automatically. Any help would be appreciated.

You can write one easily if you know the URL of the data you want. You can do the download with "wget" or "curl", both of which are text-based web browsers with a lot of options. Probably your distro has "wget" installed by default, so I would recommend starting with that one. If the data is in a weird format, say overly-complicated XML or JSON, then you will probably want to use perl or python instead of writing a shell script.

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Thank you for the immediate response.

Let me be more precise. I have a 'WRF script' to process the GFS data downloaded at a periodic interval. GFS data will have forecast file for every 6 hours. So my 'download script' should automatically download this GFS data at every 6 hours interval and it has to be linked to the 'WRF script' for processing. I think using curl or wget for downloading data automatically and continuously requires a script in which time can be incremented for each period. Kindly help me how to do this or suggest other options, if I am wrong.

If the script is to be run every six hours, then cron is the way to do it. "crontab" is the name of the program you'd use to schedule that.

However, first, I'd work out the process manually with "wget" and anything else you need. Then wrap what you've done manually into a shell script. Then when that works, call it from a cron job.

Look at the long manual page for "wget" one of the options is -O, so if your script can take input via stdin, you could pipe the data from "wget"

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