Print argument from Console

Question

i'm tring to run argument from ubuntu console.

./myTool -h

and all i get is only the print of "1".

someone can help please ?

thanks !

public static void main(String[] argv) throws Exception
{

    System.out.println("1");
    for(int i=0;i<argv.length;i++)
    {
        if (argv.equals("-h"))
        {
            System.out.println("-ip   target ip address\n");
            System.out.println("-t    time interval between each scan in milliseconds\n");
            System.out.println("-p    protocol type [UDP/TCP/ICMP]\n");
            System.out.println("-type scan type [full,stealth,fin,ack]\n");
            System.out.println("-b    bannerGrabber status\n");

        }

}

score 2 · Accepted Answer · edited May 23 '17 at 11:50

argv is an entire array. What you are trying to match, is the entire content of the array with the string -h. Try doing this:

public static void main(String[] argv) throws Exception
{

    System.out.println("1");
    for(int i=0;i<argv.length;i++)
    {
        if (argv[i].equals("-h"))
        {
            System.out.println("-ip   target ip address\n");
            System.out.println("-t    time interval between each scan in milliseconds\n");
            System.out.println("-p    protocol type [UDP/TCP/ICMP]\n");
            System.out.println("-type scan type [full,stealth,fin,ack]\n");
            System.out.println("-b    bannerGrabber status\n");

        }
     }
}

Side Note: This previous SO post might also be worth going through.

score 2 · Answer 2 · answered Apr 18 '13 at 08:23

2

You miss the array index in the if condition:

argv[i].equals("-h")

answered Apr 18 '13 at 08:23

Drogba

3,986
4
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score 0 · Answer 3 · answered Apr 18 '13 at 08:22

0

You are comparing an array with a string. Change it to:

   if (argv[i].equals("-h"))

answered Apr 18 '13 at 08:22

Klas Lindbäck

32,669
4
56
80

score 0 · Answer 4 · answered Apr 18 '13 at 08:22

0

You try to compare String[] with String.

Try instead:

    if (argv[i].equals("-h"))

answered Apr 18 '13 at 08:22

BobTheBuilder

18,283
5
37
60

Print argument from Console

4 Answers4