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perlで外部コマンドを実行する方法

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perlでシステム系コマンドの取り方
バックグランドで動かすforkやexecはほぼ却下系?
http://blog.livedoor.jp/sasata299/archives/51069647.html
http://d.hatena.ne.jp/mas-inagaki/20100107/1262847507

普通に実行するときは以下。(標準出力などは出てしまう)

perl
system($command);

プログラムの中で出力をコネコネしたい時は以下。(実行したプログラムの標準出力には出ない)

perl
open my $rs, "$command 2>&1 |";
my @rlist = <$rs>;
close $rs;
my $result = join '', @rlist;

以下の形だと実行した標準出力に出てしまうので、あんまりいけてない。
というか値(コマンド結果の標準出力)が取れないことがある。

perl
my $result = `$command 2>&1`;
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