How to run linux command from java

Question

I'm trying to run a linux command (with pipes)

using something like:

Runtime.getRuntime().exec("rpm -qa | grep "Uploader" | xargs rpm --queryformat "%{VERSION}" -q");

but i get as result only the output of the "rpm -qa"

can you help?

thanks

You could try putting your command in a script and calling that. Java gets confused when there are multiple parameters. — Steve Smith
– Steve Smith, Commented Mar 7, 2017 at 12:06
Neither java nor rpm know about pipes. Shell knows about pipes. So your best bet is to wrap your pipe in a small shell script and execute that! — Gyro Gearless
– Gyro Gearless, Commented Mar 7, 2017 at 12:08
Possible duplicate of Want to invoke a linux shell command from Java — utsav_deep
– utsav_deep, Commented Mar 7, 2017 at 12:34

Magnus · Accepted Answer · 2017-03-07 12:23:21Z

3

Only a shell understands pipes, you can invoke the shell with the command you want to run:

exec(new String[]{"/bin/sh", "-c", "rpm -qa | grep \"Uploader\" | xargs rpm --queryformat \"%{VERSION}\" -q"});

answered Mar 7, 2017 at 12:23

Magnus

8,3182 gold badges31 silver badges58 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1