&&

Perl's way (and prolly many other programming languages) way and saying and. Of course you could just use "and", confused ?

Perl borrowed this from /bin/sh, and with it, the option to and statements:

if test -n "$1"
then
  echo $0: missing argument 1>&2
  exit 1
fi

test -z "$1" &&
  { echo $0: missing argument 1>&2; exit 1; }