java return specific value to shell script

Question

public class Test200 {
    public static void main (String args []) {
        System.out.println("David");
        System.out.println("Peter");
}

}

output=$(java Test200)
echo $output

I get the both value which are David Peter. Let say I only want "David" to be returned in shell script ? Any clue ? Thanks.

user1907906 · Accepted Answer · 2013-04-10 06:59:23Z

4

You don't return "David" and "Peter", you print them to STDOUT. So if you only want to print one of these, just remove the other println call.

You can only return integer values to the shell. This is done by System.exit(status).

answered Apr 10, 2013 at 6:59

user1907906

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1 Comment

crchin Over a year ago

But now i wish return a sql error code from the java to shell , so i just need to code : System.exit(sql error code) ?

Kiran Jujare · Accepted Answer · 2013-04-10 10:34:45Z

0

Try using grep command so that it will return the expected value alone for multiple values use egrep

output=$(java Test200)

instead use

output=$(java Test200 | grep 'David')

But i didnt tested this code, it should work.

or try this

java Test200 >> outfile

all the SYSOUT will redirect to outfile base on that you can do te operation with external script.

edited Apr 10, 2013 at 10:34

answered Apr 10, 2013 at 8:14

Kiran Jujare

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2 Comments

crchin Over a year ago

This one is just an example, the output value will be different for everytimes.

crchin Over a year ago

of course your idea will not be worked. Let say the whole program have more than 20 of system.out.print? All will be printed out to the file ? it will be very messy already.

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