Java program calling a UNIX command


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Java program calling a UNIX command
# 1  
Old 11-14-2001
Question Java program calling a UNIX command

I was wondering if it was possible to call a unix command directly from a Java program during run-time. This command could very very basic e.g. "ps -ef" returned as a string, all I need is a starting place so if anyone has any suggestion or examples I would be very grateful
# 2  
Old 11-14-2001
A good example of what you want is at...

http://www.devdaily.com/java/edu/pj/...pj010016.shtml

...the code snippit...

...
// run the Unix "ps -ef" command

Process p = Runtime.getRuntime().exec("ps -ef");

BufferedReader stdInput = new BufferedReader(new
InputStreamReader(p.getInputStream()));

BufferedReader stdError = new BufferedReader(new
InputStreamReader(p.getErrorStream()));

// read the output from the command

System.out.println("Here is the standard output of the command:\n");
while ((s = stdInput.readLine()) != null) {
System.out.println(s);
}

// read any errors from the attempted command

System.out.println("Here is the standard error of the command (if any):\n");
while ((s = stdError.readLine()) != null) {
System.out.println(s);
}

...
# 3  
Old 11-15-2001
Thanks,
That does the trick nicelySmilie
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Triggering UNIX Script from a JAVA program

Hi I am trying to implement one program, where JAVA needs to trigger the backend UNIX script. Tried with options like String cmdArray = {"/bin/ksh","-c","/SCRIPT_ABSOLUTE_PATH/sampleScript.ksh /FILE_ABSOLUTE_PATH Test_File.dat TEST E SFTP"} When I trigger the script from front end with... (1 Reply)
Discussion started by: karumudi7
1 Replies

2. UNIX for Dummies Questions & Answers

Calling Macros in UNIX command

Hi .. I have created a sql macro, i want to execute this through ksh in putty.ie) sql.ksh will contain the macro query ,once i call this ksh ,the macro should trigger. I am able to write a macro : for ex: create macro macro_name (sel * from db_tablename) execute macro_name. Could... (1 Reply)
Discussion started by: Kalaiselvi66
1 Replies

3. Shell Programming and Scripting

Shell script to input as if from command line to the java program

Hi, We are having a java server which can run on command line and once initiated, it will prompt options to enter from 0 to 5. The java program kickoff respective operation once number is entered between 0 to 5. However i want to always enter "1" and write another shell program wrapper to start... (4 Replies)
Discussion started by: surya5kn
4 Replies

4. Shell Programming and Scripting

how to execute a unix shell script from a java program

Hi All, well , i am facing this problem.. i have tried a few sample codes but there isn't any solution . could anyone please give a sample code as of how to do this... Please see the below details...and read the details carefully. I have written some code, logic is 1)from... (4 Replies)
Discussion started by: aish11
4 Replies

5. Shell Programming and Scripting

How to pass the environment name while calling java program from unix script?

Hi, I'm trying to test one unix shell script in dev environment. But I'm not sure how to pass the environment in my java program calling code. I'm trying to use -DconsumerEnv="DEV" but unfortunately I get 'null' while trying to print the value from java class. System.out.println("Environment: "+... (4 Replies)
Discussion started by: Pramit
4 Replies

6. Homework & Coursework Questions

Calling compiled C program with Perl program

Long story short: I'm working inside of a Unix SSH under a bash shell. I have to code a C program that generates a random number. Then I have to call the compiled C program with a Perl program to run the C program 20 times and put all the generated random #s into a text file, then print that text... (1 Reply)
Discussion started by: jdkirby
1 Replies

7. Shell Programming and Scripting

Calling Java Method from UNIX using shell script

Hi All, I need to call a java method from a shell script. I know we can use the command java ClassName to call the main method in it. But I need to call another method that is there in the class and pass an email to it. Can I use java ClassName.MethodName(email) Any help will be... (4 Replies)
Discussion started by: RahulK
4 Replies

8. UNIX for Dummies Questions & Answers

using a variable from java program in unix

Hi, I need to execute a java program in a shell script.I then need to assign the value being returned by the program into a unix variable.Is there any way i can access the value in a variable in java program? As in if my java code has a variable, . . . . valueA =x.getValue() ..... can... (1 Reply)
Discussion started by: inquisitive101
1 Replies

9. UNIX for Dummies Questions & Answers

Connection problem with gui java program to postgreaql database using unix

Having problem in connecting my gui java program to postgreaql database. I first used setenv classpath /home/share/postgresql/java/postgresql.jar:proj1, where proj1 is my folder conatining all java and class file, to set classpath. Then javac *.java. Then java proj1.Login. It gives me... (2 Replies)
Discussion started by: uci
2 Replies

10. UNIX for Dummies Questions & Answers

executing the su command from a java program.

Say in unix (AIX) m/c, I am logged in with s1 user and want to start process p1 with user credentials of s2. I can do manually in this way: #su - s2 #enter password for s2> somePassword $ p1 But all this I have to do through a java program. How to pass the password through program. One... (1 Reply)
Discussion started by: shailendrat
1 Replies
Login or Register to Ask a Question