is there a shortcut key to edit iPXE menu entry like PXElinux's "TAB" key

[NiKiZe]

There is no way to edit commands in iPXE, mostly due to that it uses a scripting language, and there is no mapping between "a menu entry" and a "boot command" (isseq are used in most cases together with goto) most boots are done by multiple lines so does not make much sense.

For the particular use case you could use the read command to emulate this behavior. maybe in combination with prompt to get a timeout.

maybe something like this

Code:

set extracmd keymap=us
echo -n commandline && read extracmd
kernel ..... ${extracmd}