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It's very similar to the backticks ``.

It's called command substitution (posix specification) and it invokes a subshell. The command in the braces of $() or beween the backticks (``) is executed in a subshell and the output is then placed in the original command.

Unlike the backticks, the $(...) form can be nested. So you can use command substitution inside another substitution.

There are aso differences in escaping characters within the substitution. I prefer the $(...) form because the backticks form is deprecated.

It's very similar to the backticks ``.

It's called command substitution (posix specification) and it invokes a subshell. The command in the braces of $() or beween the backticks (``) is executed in a subshell and the output is then placed in the original command.

Unlike the backticks, the $(...) form can be nested. So you can use command substitution inside another substitution.

There are aso differences in escaping characters within the substitution. I prefer the $(...) form because the backticks form is deprecated.

It's very similar to the backticks ``.

It's called command substitution (posix specification) and it invokes a subshell. The command in the braces of $() or beween the backticks (``) is executed in a subshell and the output is then placed in the original command.

Unlike the backticks, the $(...) form can be nested. So you can use command substitution inside another substitution.

There are aso differences in escaping characters within the substitution. I prefer the $(...) form.

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source | link

It's very similar to the backticks ``.

It's called command substitution (posix specification) and it invokes a subshell. The command in the braces of $() or beween the backticks (``) is executed in a subshell and the output is then placed in the original command.

Unlike the backticks, the $(...) form can be nested. So you can use command substitution inside another substitution.

There are aso differences in escaping characters within the substitution. I prefer the $(...) form because the backticks form is deprecated.