eshell-debug-command

eshell-debug-command is a variable defined in `esh-cmd.el'.
Its value is

nil

• This variable may be risky if used as a file-local variable.

Documentation:
If non-nil, enable Eshell debugging code.
This is slow, and only useful for debugging problems with Eshell.
If you change this without using customize after Eshell has loaded,
you must re-load 'esh-cmd.el'.

You can customize this variable.