$ curl cheat.sh/
# sh
# Bourne shell, the standard command language interpreter.
# See also `histexpand` for history expansion.
# More information: <https://manned.org/sh>.

# Start an interactive shell session:
sh

# Execute a command and then exit:
sh -c "command"

# Execute a script:
sh path/to/script.sh

# Read and execute commands from `stdin`:
sh -s

$
Follow @igor_chubin cheat.sh tldr