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1分で実現できる有用な技術Advent Calendar 2015

Day 3
@tukiyo3

root権限でできる危険技

Last updated at Posted at 2015-12-03

1分で実現できる有用な技術 Advent Calendar 2015 3日目が空いていたので。

  • root権限(sudo)を渡すのは危険。

マウントしているDISKの初期化

  • パーティションテーブルとブート領域が消えて、次回OS起動できなくなる。
    • /領域すら消せる。
/dev/sdaの先頭をゼロ埋め
dd if=/dev/zero of=/dev/sda bs=1M count=100

強制再起動

  • これは有名。reboot
echo s > /proc/sysrq-trigger
echo b > /proc/sysrq-trigger
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