script1.pl
script2.pl && script3.pl

##</code><code>##

script1 || script2;

##</code><code>##

P:\test>perl -e"exit 1" && echo succeeded || echo failed
failed

P:\test>perl -e"exit 0" && echo succeeded || echo failed
succeeded

P:\test>perl -e"die" && echo succeeded || echo failed
Died at -e line 1.
failed

##</code><code>##

(prog1 && prog1) || (prog3 || prog4)