1.Previous
3.Next

the syntax has been criticized as awkward to nest, putting one command substitution inside another, because both the left and the right delimiters are the same. The KornShell (ksh) solved this with an alternative notation, $( ... ), borrowing from the notational style used for variable substitution. Today, most UNIX shells support this syntax. Microsoft's PowerShell also uses this notation,

1.Previous
3.Next