question: private boolean execute ( String command , File arg , List < String > lines ) { ProcessBuilder pb = new ProcessBuilder ( command , arg . getAbsolutePath ( ) ) ; pb . redirectErrorStream ( true ) ; try { Process proc = pb . start ( ) ; BufferedReader reader = new BufferedReader ( new InputStreamReader ( proc . getInputStream ( ) ) ) ; String line ; while ( ( line = reader . readLine ( ) ) != null ) { lines . add ( line ) ; } proc . waitFor ( ) ; return proc . exitValue ( ) == 0 ; } catch ( Exception e ) { log . error ( "Exception while executing: " + command + " " + arg , e ) ; lines . add ( e . getMessage ( ) ) ; return false ; } }
target:  Executes a command with one argument, returning true if the command succeeds. Gathers the output from stdout and stderr into the provided list of lines.