First of all, we need to enter our local server where we will be able to check all the knives that are available in CS: GO. For this purpose, we can simply turn on training with bots through the game menu, or enter map <map_name> in the console, i.e. turn on the console and enter nuke map in it - after loading the map, it is also worth entering bot_kick and mp_warmup_pausetimer 1 in the console so that you do not warm up finished and the bots were kicked from our server.

Now the most important thing - enter the following two commands into the console. The first command will allow us to add knives in CS: GO and the second will add the option to throw away our current knife. For each change of the scythe, we will have to throw away the previous one - otherwise the added scythe will remain on the ground.

sv_cheats 1
mp_drop_knife_enable 1

After entering the above commands, we can proceed to adding knives. All we have to do is throw away our current knife through G and then enter the command in the console that will give us the selected knife

Command on the CT knife
give weapon_knife

Command for the TT knife
give weapon_knife_t

Command for a CS:GO golden knife
give weapon_knifegg; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Headquarters on Karambit
give weapon_knife_karambit; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command on the M9 Bayonet
give weapon_knife_m9_bayonet; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Bayonet headquarters
give weapon_bayonet; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command on a Butterfly Knife
give weapon_knife_butterfly; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Knife command from CS 1.6
give weapon_knife_css; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command on the Flip Knife
give weapon_knife_flip; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command on Huntsman
give weapon_knife_tactical; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Falchion Knife Command
give weapon_knife_falchion; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Headquarters on Bowie Knife
give weapon_knife_survival_bowie; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Shadow Daggers command
give weapon_knife_push; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command for a Navaja knife
give weapon_knife_gypsy_jackknife; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command for the Talon knife
give weapon_knife_widowmaker; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Survival knife command
give weapon_knife_canis; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command for a Paracord knife
give weapon_knife_cord; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command for the Nomad knife
give weapon_knife_outdoor; ent_fire weapon_knife addoutput "classname weapon_knifegg"

Command for the Skeleton scythe
give weapon_knife_skeleton; ent_fire weapon_knife addoutput "classname weapon_knifegg"

And as a bonus, the command for the Ghost knife:
give weapon_knife_ghost; ent_fire weapon_knife addoutput "classname weapon_knifegg"