Subshells

Enclose a command or commands in parens to run it in a subshell.
A completely new Bash process runs the commands you enclose.

Example 
Send output of two commands to a third via one pipe:

     $ ( echo "Hello, cutie!" ; echo Miss you! ) \
     >   | mail sweetie@home_sweet_home.com

Poor-man's daemonize

     $ ( mozilla-firefox &)