how to run a command at terminal from java program

Question

I need to run a command at terminal in Fedora 16 from a JAVA program  I tried using  Runtime getRuntime   exec  xterm       but this just opens the terminal  i am unable to execute any command   I also tried this   OutputStream out   null  Process proc   new ProcessBuilder  xterm   start    out   proc getOutputStream      out write  any command  getBytes       out flush       but still i can only open the terminal  but can t run the command  Any ideas as to how to do it

User · Answer

You don t actually need to run a command from an xterm session  you can run it directly   String   arguments   new String      path to executable    arg0    arg1    etc    Process proc   new ProcessBuilder arguments  start      If the process responds interactively to the input stream  and you want to inject values  then do what you did before   OutputStream out   proc getOutputStream      out write  command n      out flush      Don t forget the   n  at the end though as most apps will use it to identify the end of a single command s input

User · Answer

You need to run it using bash executable like this   Runtime getRuntime   exec   bin bash -c your command      Update  As suggested by xav  it is advisable to use ProcessBuilder instead   String   args   new String      bin bash    -c    your command    with    args    Process proc   new ProcessBuilder args  start

User · Answer

I know this question is quite old  but here s a library that encapsulates the ProcessBuilder api

User · Answer

I vote for Karthik T s answer   you don t need to open a terminal to run commands     For example      file  RunShellCommandFromJava java import java io BufferedReader  import java io InputStreamReader   public class RunShellCommandFromJava        public static void main String   args             String command    ping -c 3 www google com            Process proc   Runtime getRuntime   exec command               Read the output          BufferedReader reader                   new BufferedReader new InputStreamReader proc getInputStream               String line               while  line   reader readLine       null                System out print line     n                       proc waitFor                   The output      javac RunShellCommandFromJava java   java RunShellCommandFromJava PING http   google com  123 125 81 12   56 data bytes 64 bytes from 123 125 81 12  icmp seq 0 ttl 59 time 108 771 ms 64 bytes from 123 125 81 12  icmp seq 1 ttl 59 time 119 601 ms 64 bytes from 123 125 81 12  icmp seq 2 ttl 59 time 11 004 ms  --- http   google com ping statistics --- 3 packets transmitted  3 packets received  0 0  packet loss round-trip min avg max stddev   11 004 79 792 119 601 48 841 ms

User · Answer

As others said  you may run your external program without xterm  However  if you want to run it in a terminal window  e g  to let the user interact with it  xterm allows you to specify the program to run as parameter   xterm -e any command   In Java code this becomes   String   command      xterm    -e    my    command    with    parameters     Runtime getRuntime   exec command     Or  using ProcessBuilder   String   command      xterm    -e    my    command    with    parameters     Process proc   new ProcessBuilder command  start

User · Answer

I don t know why  but for some reason  the   bin bash  version didn t work for me  Instead  the simpler version worked  following the example given here at Oracle Docs   String   args   new String     ping    www google com    Process proc   new ProcessBuilder args  start

[java] how to run a command at terminal from java program?

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