Question about execs in Source

[RickAstley]

I've seen some videos by people such as EvilDaedalus on jewtube, and I see them use things like "holyshit.cfg" in the game "Sourceforts(an HL2 mod that is easy as hell to grief") and killall.txt in Garrys Mod. I just want to know how some people make things like this, the "Holyshit.cfg" was a nuclear explosion of some sort that also destroyed all of the blocks and killed all the players even through the walls.

[[myg0t]SourceX]

You may want to go on the myg0t forums and ask as Daed and other members of ours custom build a lot of those "machines" to rage with.

[NotDaed]

That file was just a script I made when I found a sv_cheats 1 server. Basically it made every phys prop easily breakable (even a person bumping into it would kill it), and on break it would create a powerful explosion, starting a chain reaction. This is the script:
ent_fire prop_physics addoutput "spawnflags 256"
ent_fire prop_physics addoutput "physdamagescale 9999"
ent_fire prop_physics addoutput "exploderadius 1000"
ent_fire prop_physics addoutput "explodedamage 6000"
ent_fire prop_physics addoutput "OnHealthChanged !self,sethealth,0"

And the killall thing is something from xcloudx's gmod pack. Search around the myg0t forums for that. Though I'm not sure it still works with gmod10.