Today (Saturday) We will make some minor tuning adjustments to MySQL.

You may experience 2 up to 10 seconds "glitch time" when we restart MySQL. We expect to make these adjustments around 1AM Eastern Daylight Saving Time (EDT) US.


Simple loop to mail all active users.

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# 8  
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  
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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