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Old Unix and Linux 11-09-2016
vbe's Unix or Linux Image
vbe vbe is offline Forum Staff  
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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...
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Old Unix and Linux 11-09-2016
RudiC RudiC is offline Forum Staff  
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man bash and search for command substitution.


Quote:
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:
$(command)
or (“backquoted” version):
`command`
.
.
.

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