It works for more than databases. - With shells, I prefix risky commands on production machines with #, especially when cutting and pasting - Same for committ

It works for more than databases. - With shells, I prefix risky commands on production machines with #, especially when cutting and pasting - Same for committing stuff into VCS, especially when I'm cherrypicking diffs to commit - Before running find with -delete, run with -print first. Many other utilities have dry-run modes