piping data

[Jeff Kish]

Hi.

Is it possible to write a java app that you could use to grab a stream of data
on the console and output it again, possibly to another app that you could
then chain together?

If so how would you go about writing and invoking this?

For example, if I run a program that sends data to the console, say grep
"<tag" *.xml,

I'd like to be able to do "something" like:

grep "<tag" *.xml | someWayToInvokeSomeJavaProgram
| someWayToInvokeSomeJavaProgram2

so that the output can go through two transformations.

Thanks

Jeff Kish

 

[Thomas Fritsch]

Hi. Hi!

Is it possible to write a java app that you could use to grab a stream of data
on the console and output it again, possibly to another app that you could
then chain together?

If so how would you go about writing and invoking this?

For example, if I run a program that sends data to the console, say grep
"<tag" *.xml,

I'd like to be able to do "something" like:

grep "<tag" *.xml | someWayToInvokeSomeJavaProgram
| someWayToInvokeSomeJavaProgram2

so that the output can go through two transformations.

Thanks

Jeff Kish

It is simple and straight forward:
grep "<tag" *.xml | java Class1 | java Class2

Each of your 2 java classes has to do (in its main method):
* read from System.in and write to System.out
* when detecting end-of-input, call System.exit(0)