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bashで標準出力と標準エラー出力の一括リダイレクト

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詳細はman bashで。

Redirecting Standard Output and Standard Error

標準出力と標準エラー出力を一括してリダイレクト。これは相当前からある機能。

command &> file
若しくは
command >& file
で以下と同じ効果となる
command > file 2>&1

Appending Standard Output and Standard Error

標準出力と標準エラー出力を追記形式でリダイレクト。
これはbash 4.0からの機能。RHEL/CentOSのデフォルトrpm的には6.0から。

command &>> file
以下と同じ効果となる
command >> file 2>&1
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