bind "n" "+cichec4.01" ;alias +cichec4.01 "+use; +attack2; wait; -attack2" ;alias -cichec4.01 "-use; -attack2"
First of all you must change your weapon to the knife because this script dont make it for you, then when you have a knife use this script on the bomb :)
INSTALL NOTE: Copy it to the userconfig.cfg file. If you dont have this file, copy your config.cfg and the open it, delete all and paste script and then rename it to the userconfig.
KEYS: N - hold this key when you have a knife while defusing bomb