See Which Process Has a File Open with fuser

Today I learned you can see which processes have a file open with fuser. For example, if I wanted to see what process was writing to log/development.log in my rails app, I'd run

$ fuser log/development.log
log/development.log: 76170

So the process with PID 76170 has the file open. Running ps will show me the process details:

$ ps 76170
  PID   TT  STAT      TIME COMMAND
76170 s008  S+     0:02.86 ruby bin/rails console

Turns out I had a rails console running!

You could also turn this into a one-liner with xargs:

$ fuser log/development.log | xargs ps

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