How to break pdfs into multiple pdf pages in linux
pdftk - The pdf toolkit
aptitude install pdftk
$ pdftk my_multi_page.pdf burst
Refernce link https://charlieharvey.org.uk/page/howto_breaking_pdfs_up_into_mutiple_pages
Best worked
pdfsam - Pdf split and merge - GUI
https://apps.ubuntu.com/cat/applications/natty/pdfsam/
Handbrake GUI and CLI for converting video and optimize the size
command to rotate the video to 90 deg: HandBrakeCLI -i source -o target.m4v --preset="Universal" --rotate="4"
restore lost firefox tabs
go to the firefox menu ≡ > help ? > troubleshooting information, click on profile folder/show folder. a window should open up - in there look for files starting with sessionstore which have a change date before the crash. when you copy the contents of the sessionstore.bak file(s) into this web service: https://firefox-session-restore.herokuapp.com/