public void execute()

in kerby-tool/kdc-tool/src/main/java/org/apache/kerby/kerberos/tool/kadmin/command/KeytabRemoveCommand.java [41:96]
50 lines of code
13 McCabe index (conditional complexity)

    public void execute(String input) {
        String[] commands = input.split("\\s+");
        if (commands.length < 2 || commands.length > 6) {
            System.err.println(USAGE);
            return;
        }

        String principal;
        String keytabFileLocation;
        String removeOption = null;
        int lastIndex;

        if (commands[commands.length - 1].matches("^all|old|-?\\d+$")) {
            if (commands.length < 3) {
                System.err.println(USAGE);
                return;
            }
            lastIndex = commands.length - 3;
            principal = commands[commands.length - 2];
            removeOption = commands[commands.length - 1];
        } else {
            lastIndex = commands.length - 2;
            principal = commands[commands.length - 1];
        }
        KOptions kOptions = ToolUtil.parseOptions(commands, 1, lastIndex);

        if (principal == null || kOptions == null
                || kOptions.contains(KadminOption.K) && kOptions.contains(KadminOption.KEYTAB)) {
            System.err.println(USAGE);
            return;
        }

        keytabFileLocation = kOptions.contains(KadminOption.K)
                ? kOptions.getStringOption(KadminOption.K)
                : kOptions.getStringOption(KadminOption.KEYTAB);

        if (keytabFileLocation == null) {
            keytabFileLocation = DEFAULT_KEYTAB_FILE;
        }
        File keytabFile = new File(keytabFileLocation);

        try {
            if ("all".equals(removeOption)) {
                getKadmin().removeKeytabEntriesOf(keytabFile, principal);
            } else if ("old".equals(removeOption)) {
                getKadmin().removeOldKeytabEntriesOf(keytabFile, principal);
            } else {
                int kvno = Integer.parseInt(removeOption);
                getKadmin().removeKeytabEntriesOf(keytabFile, principal, kvno);
            }
            System.out.println("Done!");
        } catch (KrbException e) {
            System.err.println("Principal \"" + principal + "\" fail to remove entry from keytab."
                    + e.getMessage());
        }
    }