can't exected md5sum command. cat u* p* r* | md5sum > auth.txt

[snajeeb shah]

Hi,

I make a file using

cat u* p* r* | md5sum > auth.txt

. then in java I want to execute the command

cat u* p* r* | md5sum -c " + "/home/xxxx/auth.txt

to compare if check some is valid.

The problem is I can't see the result of the command. It return

-: OK

in console but shows int value regardless it matched or not.
How would I know if the check is executed and result is

-: OK

.

[Campbell Ritchie]

You appear to have posted in the wrong place. I shall move this thread to a more appropriate location and duplicate it in another forum.

[Rob Spoor]

snajeeb shah wrote:then in java I want to execute the command

cat u* p* r* | md5sum -c " + "/home/xxxx/auth.txt

to compare if check some is valid.

That's not one command, it's two that are combined using the pipe separator. To do this in Java you have two choices: create a shell script that contains that line and call the shell script, or create two processes and redirect output from the first to the input of the second yourself.

Also, have you already read When Runtime.exec() won't? Even if you're using a ProcessBuilder, the article is still a required read when dealing with external processes in Java.

[snajeeb shah]

String[] cmdChecksum = {
				"bash",
				"-c",
				"cat " +  "r*  u* p* " + " | md5sum -c " + "auth.txt" };

if (processComplete == 0) {
					count++;					
				} else { //error
					
				}

InputStream cmdStdOut = process.getInputStream();
				
				String line;
				BufferedReader stdOut = new BufferedReader (new InputStreamReader (cmdStdOut));
				while ((line = stdOut.readLine ()) != null)
				{
					cksm = line;
					logger.log(Level.INFO, line);					
				}

This snippet worked for me.