~/MyPerl
   |
   |__ ans # this stores all the .fasta files (input)
   |__ result_ans # to store the result
   |__ mycode.pl

##</code><code>##

find  ans/ -name '*.fasta' -maxdepth 1 -print0 \
| xargs -r -0 -P5 -n1 sh -c 'perl mycode.pl "$1" > ~/MyPerl/result_ans/"$1".out' ''


##</code><code>##

: /home/myname/MyPerl/result_ans/ans/hm14_ans.fasta.out: No such file or directory