Pipe multiple commands into a single command

Question

How can I pipe the stdout of multiple commands to a single command?

Example 1: combine and sort the output of all three echo commands:

echo zzz; ec         


        

Answer 1

Use parentheses ()'s to combine the commands into a single process, which will concatenate the stdout of each of them.

Example 1 (note that $ is the shell prompt):

$ (echo zzz; echo aaa; echo kkk) | sort
aaa
kkk
zzz

Example 2:

(setopt; unsetopt; set) | sort