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my $set_password = '/usr/bin/ssh ' . $master_host . " 'echo \Q$new_pas
+sword\E | /usr/bin/passwd --stdin \Q$username\E'";

my $master_host  = 'localhost';
my $username     = 'foo';
...
pwd: a'b$c"d|e
cmd: /usr/bin/ssh localhost 'echo a\'b\$c\"d\|e | /usr/bin/passwd --st
+din foo'
sh: Syntax error: Unterminated quoted string