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Dangerous Commands

Commands worth understanding before copying from the internet.

4 checked fixes

Commands in this topic

Dangerous Commands Dry run

One rsync flag can save you. Another can erase the wrong side.

rsync -avhn --delete ./source/ ./backup/

Dangerous Commands Read-only

The permission fix was easy. Knowing what not to chmod was the hard part.

namei -l /var/www/example/index.html

Dangerous Commands Dry run

`rsync --delete` is useful. It is also how people erase the wrong side.

rsync -avhn --delete ./source/ ./backup/ | grep '^deleting'

Dangerous Commands Deletes data

The reviewable cleanup command is the one you print before you run.

find /var/tmp/uploads -xdev -type f -mtime +7 -printf 'rm -i -- %p\n' 2>/dev/null