perl 多fasta文件匹配，并提取匹配文件第一条序列

目标如题，有多个fasta文件和一个文件名列表，将文件名列表中包含的文件匹配出来并提取第一条序列合并成一个fa文件。

这个采用perl实现，用法和代码如下：

#!/usr/bin/perl -w
use strict;

sub usage{
	die "usage:perl $0 <fa.list> <Fasta_Dir> <merged.fa>
",unless(@ARGV==3);
}
usage();

open LIST,"$ARGV[0]";
open F,"$ARGV[1]";
open OU,">$ARGV[2]";

my @listName=<LIST>;

my @files=glob("$ARGV[1]/*.faa");
my $matchNum=0;

foreach my $k(@files){
	my $fileName=(split ///,$k)[-1];
	if(grep /^$fileName$/,@listName){
		$matchNum+=1;
		open EACH,"$ARGV[1]/$fileName";
		$/=">";
		<EACH>;
		while(<EACH>){
			chomp;
			my @info=split /
/,$_;
			my $seqID=shift @info;
			my $seq=join "",@info;
			print OU ">$seqID
$seq
";
			last;
		}
		$/="
";
	}
}

print "match: $matchNum files,and merge completed!
";

close LIST;
close F;