linux: show files opened by apps

some quick tips about viewing files associated with process.

  • lsof -h → show a short help file
  • lsof fpath → show all associated with file fpath
  • lsof -i → list files associated with internet (⁖ browser process)
  • lsof -u name → login/uid
  • lsof -p pid → pid. 123,^456
  • lsof +d dir → by dir path dir
  • lsof +D dir → by dir path dir, also show all dir's children
  • lsof -c cmd → show files opened by command whose name starts with cmd

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