some_user's questions

Say I have a *.zip file, and want to use the unzipped files - more precisely the filenames - directly as input to another command in the terminal. How could this be accomplished?

An example:
- I have a zip-file containing several pdf-files
- I want to merge the pdf-files to one, using e.g. ghostscript

gs -sDEVICE=pdfwriter -sOutputFile=out.pdf <pdf-files from zip>

I want to download all *.pdf files on a website recursively. What I could achieve so far is:

• Store the cookies needed for the login page with this question
• Download a specific file by copy and pasting the direct download link from my browser.
  Now I tried using the following command:
  wget --recursive --no-parent -A pdf --load-cookies cookies.txt https://example.com
  

But I just got some empty folders, which leads me to believe I didn't use the correct link. How can I find the correct link for the recursive download?

I have a Lenovo L13 Yoga and Lenovo ThinkPad Pen Pro with Ubuntu 19.10 installed on it.
I'd like to be able to use certain keyboard shortcuts while the notebook is folded down (especially shift + prt screen, to select an area with my stylus to screenshot).
Is there a way to achieve this, preferably other than using an on-screen keyboard?