lsof basics - list open files on Linux and Unix (expand for timestamps and details). In this video I introduce the 'lsof' command, found on Linux and Unix systems. I'll show you some practical examples and teach you how to explore what's happening with the filesytem in a system or process. 1:00 Which files are open? lsof 2:56 Which processes have this file open? lsof /var/log/nginx-error.log 4:49 Which files does process X have open? lsof -p 1 lsof -p `pgrep ABC` 7:08 Where is the binary for this process? lsof -p ABC | grep bin 7:44 Which shared libraries is this program using? (manually upgrading software, i.e. openssl) lsof -p PID | grep .so 8:03 Where is this thing logging to? lsof -p ABC | grep log 8:40 Which processes still have this old library open? lsof grep libname.so 9:45 Which files does user XYZ have open? lsof -u XYZ lsof -u XYZ -i # network only 10:25 Which process is listening on Port X (or using Protocol Y)? lsof -i :80 lsof -i tcp 11:21 Super lsof Story Time! 14:03 Exercises My step-by-step project-based Linux course for beginners: https://www.udemy.com/course/hands-on-linux-self-hosted-wordpress-for-linux-beginners/?referralCode=19C0A7DEE2FD53C9C09D Free Linux Sysadmin Course Playlist:    • The Linux Basics Course: Beginner to ...   DigitalOcean referral link: https://m.do.co/c/0380a1db56a6 Patreon: https://www.patreon.com/tutorialinux Official Site & e-mail list: https://tutorialinux.com/ Twitter: https://twitter.com/tutorialinux Facebook: https://www.facebook.com/tutorialinux Podcast: http://kernelpanicpodcast.com/