There are a lot of commands that start with ent_fire so I just decided to put them all here.
ent_fire !picker skin # - changes the skin of the object you are looking at
ent_fire !picker ignite - sets the object you are looking at on fire
ent_fire !picker enable - enables things like the excursion funnel and light bridge emitters
ent_fire !picker disable - disables the things you enabled
ent_fire <entity name here> - will pick up the entity which is specified
ent_fire !picker open - opens things like doors
ent_fire !picker close - closes the objects you opened
ent_fire !picker disablecollision - disables the collision of the object you are looking at
ent_fire !picker color r/g/b - changes the color of the object you are looking at
ent_fire @chapter_title_text - puts "chapter_title" on your screen for a second
ent_fire @chapter_subtitle_text - puts "chapter_subtitle" on your screen for a second
ent_fire !picker addoutput "spawnflags 512" - the turret you are looking at shoots cameras
ent_fire prop_portal fizzle - removes portals
ent_fire wheatley_monitor-relay_deploy_15degrees trigger - opens Wheatley's monitors