Question

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Shell Programming: What's the difference between $(command) and command

It seems there is no difference between

$()

and

``

For example,

$(date)

is the same as

`date`

Any suggestion ?

Answer 1

What’s the difference between man command and stackoverflow.com? 🙂

When the old-style backquote form of substitution is used, backslash
retains its literal meaning except when followed by $, `, or \.
The first backquote not preceded by a backslash terminates the command
substitution. When using the $(command) form, all characters between
the parentheses make up the command; none are treated specially.

so, if you put date inside, it’s more or less the same.