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シェルスクリプトで複数行のコメントアウト

More than 5 years have passed since last update.

一行コメントアウト

最初に、一行コメントアウトについて触れておきます。シェルスクリプトで、"#"を用いた行はそれ以降コメントアウトとみなされます。

例えば、次のようなスクリプトを実行すると"Hi, Jiro!"のみ出力されます。

#!/bin/bash
# echo "Hi, Ichiro!"
echo "Hi, Jiro!" # echo "Hi, Saburo!"

行の途中からでもコメントアウトできることに注意してください。

複数行コメントアウト

複数行をコメントアウトするには、"<<"と任意の文字列(例:"COMMENTOUT")を使い、まずコメントアウトを開始します。そして、行頭に、先ほどの任意の文字列(例:"COMMENTOUT")が出てくるとコメントアウトが終了します。

例えば、以下のようなスクリプトを実行すると、"Hi, Ichiro!"のみ出力されます。

#!/bin/bash
echo "Hi, Ichiro!"
<< COMMENTOUT
echo "Hi, Jiro!"
echo "Hi, Saburo!"
COMMENTOUT
kaw
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