How to get small part of a command output

Question

Following this post http://blog.zwiegnet.com/linux-server/get-centosred-hat-original-system-install-date/ I would like to get the Linux installation date.

Process p = Runtime.getRuntime().exec("rpm -qi basesystem");

Can you tell me how I can execute the command and capture only the installation date as show into the post.

I want to get the complete output and filter the content using Java. And the final result should be something like this for example:

Thu 28 Nov 2013 06:01:06 PM EST

http://stackoverflow.com/q/5711084/106261 – NimChimpsky Apr 28 '14 at 13:26 — NimChimpsky, Apr 28 '14 at 13:26

score 2 · Answer 1 · answered Apr 28 '14 at 13:34

2

Read the input stream and parse it:

Process proc = Runtime.getRuntime().exec("rpm -qi basesystem");
InputStream stdin = proc.getInputStream();
InputStreamReader isr = new InputStreamReader(stdin);
BufferedReader br = new BufferedReader(isr);

String line = null;
Date date = null

while ( (line = br.readLine()) != null) {
  // check each line for the date you need
  // set date
  // break;
}

answered Apr 28 '14 at 13:34

BetaRide

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Your answer is good but just what I needed is provided as comment. Could you add some more code example about the while loop, please? – user1285928 Apr 28 '14 at 13:37

How to get small part of a command output

1 Answers1