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Simple loop to mail all active users.

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# 8  
Old 11-09-2016
You havent been searching much, in less than 15 seconds I got this:
Command substitution - Linux Shell Scripting Tutorial - A Beginner's handbook

But many more exist out there...
That said this link should solve all your issues...
# 9  
Old 11-09-2016
man bash and search for command substitution.

Command Substitution
Command substitution allows the output of a command to be substituted in place of the command name itself. Command substitution occurs when the command is enclosed as follows:
or (“backquoted” version):

It's been around in sh already, so it MUST be there. What shell and version do you use?
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