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I would like to know what command would:

  1. select all URL in a file (i.e. recognize all addresses beginning with http or www from the beginning to the end and separate them from text or other data)

  2. output them in a .txt file.

The idea is to perform next a wget -i on the .txt file. I need to properly select and output these URL in a .txt file as wget struggles to directly identify all URL in the raw file.

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Thanks a lot, I followed instructions in the link above (1) and it worked perfectly in my case (as URL are between < href > in the input file):

grep -Po '(?<=href=")[^"]*(?=")' INPUT_FILE > OUTPUT_FILE.txt

Question solved, thanks again!

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