I use Windows at home, so I surfed some sites to find how to do the same thing on my OS.
d: cd d:\xampp\htdocs\processwire findstr /s /i /l /n /c:"function ___" *.* > hooks.txtOf course, you have to substitute disk and path, so your root processwire folder is specified.
You'll get hooks.txt, containing all lines with hookable functions and its line number in the file. Use Ctrl+F to search a needed string.
If you are really lazy, just use the file attached