Direst output infos to files

[wfc1102]

Nice jobs. most articles are downloaded automaticlly, but a few cannot be found like below:
DOI: 10.1080/16742834.2014.11447220
Sci-Hub Link: https://sci-hub.se/10.1080/16742834.2014.11447220
checking if has captcha...
No pdf found. Maybe, the sci-hub dosen't have the file
Try to open the link in your browser.

Then, I'd like to grep the Sci-Hub Link only and save the Link to a.txt.
scihub2pdf --title ${article_title} > a.txt
doens't work, it will treat '${article_title} > a.txt' as a whole title.
Appreciate if you could solve it.
For example, add an option -d to direst the scihub2pdf infos to files. Thanks.