how to exec linux shell step by step with java

Question

linux(centos 6):

step 1

$:yum install xxx

reture some message like

"Are you OK with your IP being logged? (Y)es/(N)o"

step 2

$:Y

the install is going on.(other commands maybe have step 3)

but how can i execute this cammands with java?

this is my java code:

String[] commands = new String[]{"yum","install","xxx"};
Runtime run = Runtime.getRuntime();
Process pr = run.exec(commands);
Reader reader = new InputStreamReader(pr.getInputStream());
BufferedReader bf = new BufferedReader(reader);

the bf include

"Are you OK with your IP being logged?"

Now how can i execute the command( "Y" ) so that the install can going on

please help me.

Answer 1

I don't know how you can execute the command with a "y" (Yes) but instead you could run yum as follows

yum -y install xxx

-y, --assumeyes Assume yes; assume that the answer to any question which would be asked is yes. Configuration Option: assumeyes See: https://linux.die.net/man/8/yum