backticks
Executes a shell command and captures its standard output.
Passes the command string to /bin/sh -c "..." for execution.
In scalar context, returns the entire captured stdout as a single
string. In list context, returns a list of lines (each including
its trailing newline), split on $/ (input record separator).
After execution, $? (child error) is set to the child process
wait status. Stdin is inherited from the parent so that
interactive commands (e.g. tput) work correctly; stderr is also
inherited.
Synopsis
my $output = `command`;
my $output = qx{command};
my @lines = `command`;