There's the if-then-elseif method:

on 1:TEXT:*:#some-channel:{
tokenize 32 $strip($1-)
if ($1 == cmd1) {
write file1.txt $gettok($1-,7,32)
}
elseif ($1 == cmd2) {
write file2.txt $gettok($1-,7,32)
}
elseif ($1 == cmd3) {
write file3.txt etc..
}
...

etc...

You may want to use tokenize 32 $strip($1-) so you don't have to use $strip() repeatedly in every trigger.