Command Checker
Paste a shell command found online before running it: what each part does, and what's risky in it (a script piped to bash, hidden characters, a disk wiped)
Command
For bash, zsh and the other shells of Linux and macOS. The command is read here, never run nor sent: what a downloaded script holds, or what a variable or an alias of your machine stands for, can't be known from it.
What to check
At a glance
What it does