ken@ganymede: ~/tmp
$ ls -l *.fasta
ls: *.fasta: No such file or directory
ken@ganymede: ~/tmp
$ multifileout.pl
ken@ganymede: ~/tmp
$ ls -l *.fasta
-rw-r--r--  1 ken  staff  18  7 Feb 08:29 abc.fasta
-rw-r--r--  1 ken  staff  18  7 Feb 08:29 def.fasta
-rw-r--r--  1 ken  staff  18  7 Feb 08:29 ghi.fasta
ken@ganymede: ~/tmp
$ cat abc.fasta
abc
a123
abc
a456
ken@ganymede: ~/tmp
$ cat def.fasta
def
d123
def
d456
ken@ganymede: ~/tmp
$ cat ghi.fasta
ghi
g123
ghi
g456
ken@ganymede: ~/tmp
$