consolidate file in unix

hi,
i am trying to consolodate the files in the unix with the '>>' i have some 50 or 60 files.is there any another way of consolidating the alll 50 or 60 files in to one file. actually the way i m doing creaating the problem while loading the file with teradat tpump and fasload.
so if there is any command with which i can do the same.

cat * > outfile  [ all the files in the direcotry]
cat *.txt > onefile

if all of them hav .txt

but all files with differnet names and one more thing i dont want to do with this operation >
is there any command that effiecently do the same thing

"tee

$command | tee -a output.file

for more info use "$man tee"