Fix for El Capitan stuck at log-in... question from someone out of there depth?

Yes there is a typo in my post, make sure there is no . after the | it should be | grep

but we could navigate manually to the file in question as you are not having much success with the above command.

To show hidden files on your Mac enter this in Terminal

defaults write com.apple.finder AppleShowAllFiles -boolean true ; killall Finder

press Return.

Now you can navigate through the folders, Private/Var/Folders in Folders you should see a list of other folders, click on the first one, then you should see another folder open that then open O and then you should see the com.apple.LaunchServices csstore file. The image below is where mine is kept, the names of some of the folders in yours may differ.

And I get...

find/Volumes/MacintoshHD/private/var/folders/: No such file or directory

You did not put a space after the word 'find'

First of all do you have a mounted volume called "/Volumes/Macintosh HD". Try the command

/bin/df

This should list the mounted file systems. Once you know the exact "Mounted on" path, you can compost your 'find' command being very careful about white space and protecting the white space.

If you cannot get your spacing correct, then try getting there one folder at a time

cd /Volumes

ls

cd "Macintosh HD" # assuming that is the name of the mounted boot disk

ls

cd private

ls

cd var

ls

cd folders

ls

find . | grep com.apple.LaunchServices | grep csstore

As Macintosh HD is two words you would need to type find /Volumes/Macintosh\ HD/private/var/folders/ | grep com.apple.LaunchServices |. grep csstore

See if that works.

I should also add there is another csstore file, look in the folder zz and in the folder beginning pyx etc ending in 00000000 and then look in the folder O.

See below