run code from java process

Author: cherkavi

process-execute/read.md

@@ -0,0 +1,35 @@
+exeucte command line application and get the result ( with pipes )
+```sh
+        ProcessBuilder pb = new ProcessBuilder();
+        pb.command("/bin/sh", "-c", String.format("cat %s | grep %s | head -n 1", csvPath, occurence));
+	// !!! do not use without "/bin/sh" !!!!
+        Process proc = pb.start();
+        try {
+            proc.waitFor(10, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            throw new IOException(e.getMessage());
+        }
+
+        String responseLine = "";
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(proc.getInputStream()))) {
+            responseLine = reader.readLine();
+        }
+	// no result has found
+        if(responseLine == null){            
+            return StringUtils.EMPTY;
+        }
+
+```
+
+[example](https://github.com/zeroturnaround/zt-exec)
+```java
+        result = new ProcessExecutor().commandSplit(commandLine).start().getFuture().get();
+        if(result.getExitValue()!=0){
+            throw new IllegalStateException("result of command line execution is not 0: "+result.getExitValue());
+        }
+
+        List<String> output = new ProcessExecutor().commandSplit(commandLine).execute().getOutput().getLines();
+	
+```
+
+http://commons.apache.org/proper/commons-exec/tutorial.html