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programming-examples/perl/String/The crypt function encrypts...

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open (PASSWD, "/u/jqpublic/passwd") || die ("Can't open password file");
$passwd = <PASSWD>;
chop ($passwd);
close (PASSWD);
$mypasswd = "asdf";
if (crypt ($mypasswd, substr($passwd, 0, 2)) eq $passwd) {
print ("Correct! Carry on!\n");
} else {
die ("Incorrect password: goodbye!\n");