eshell-prepare-command-hook

eshell-prepare-command-hook 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:
A set of functions called to prepare a named command.
The command name and its argument are in `eshell-last-command-name'
and `eshell-last-arguments'. The functions on this hook can change
the value of these symbols if necessary.

To prevent a command from executing at all, set
`eshell-last-command-name' to nil.

You can customize this variable.