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perl コマンドラインオプション -s

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perlの起動オプションに -s(switchオプション) をつけとくと それが変数でとれるようになる
例えば-XXX=ZZZ や -YYY といった引数をスクリプト内で変数として使えます。便利ですね。

#!/usr/bin/perl -s

# 普通に考えると定義してない変数2つ使ってるからうごかん
print $unko if $shif;
# しかしyesyes!
$ ./switch.pl -unko="yesyes!" -shit
yesyes!
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