As mentioned earlier, if any list operator (print, etc.) or
any unary operator (chdir, etc.)
is followed by a left parenthesis as the next token on the same line,
the operator and arguments within parentheses are taken to
be of highest precedence, just like a normal function call.
In the absence of parentheses,
the precedence of list operators such as print, sort or chmod is
either very high or very low depending on whether you look at the left
side of operator or the right side of it.
For example, in
the commas on the right of the sort are evaluated before the sort, but
the commas on the left are evaluated after.
In other words, list operators tend to gobble up all the arguments that
follow them, and then act like a simple term with regard to the preceding
Note that you have to be careful with parens:
# These evaluate exit before doing the print:
print($foo, exit); # Obviously not what you want.
print $foo, exit; # Nor is this.
# These do the print before evaluating exit:
(print $foo), exit; # This is what you want.
print($foo), exit; # Or this.
print ($foo), exit; # Or even this.
Also note that
print ($foo & 255) + 1, "\n";
probably doesn't do what you expect at first glance.