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Using curl to download sequential files

We all know one may use curl to download sequential files like this:

curl -O http://www.example.com/file[01-09].txt

But what if the site admin named the files using a more complicated scheme like “file01_101.txt” and “file02_102.txt”?

You can actually pass a simple for loop using a variable, like this:

for x in {1..9}; do curl -O http://www.example.com/file0{$x}_10{$x}.txt; done;

If the URL gets more complicated like “file01-oo.jpg” and “file02-01.jpg” but still have a pattern, you can get creative too!

y=0; 
for x in {1..9}; do y=$(( $x-1 )); 
//for testing// echo "file0$x_$y.jpg"; 
//actual// curl -O http://www.example.com/file0{$x}_{$y}.jpg; 
done; 



HTH :)

Posted in Apple, English.


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