CODEWITHSUNDEEP
bashnamed-pipes
Racer
Racer

Reputation: 564

Read from a named pipe in bash and pipe it into a java process

I have a JAVA-Jar-File which is provided by a third-party-dev. The File reads from STDIN and writes to STDOUT.

I was able to configure the JAR-File to write to a log file instead.

But I also have to rewrite the input-source from STDIN to a named pipe, so I can send commands to the java-pocess via my own application.

I already tried this two things to read from the pipeline (bash):

cat < pipeline_name | java -jar external_application.jar

This works fine for the first command. After receiving the first input line, the 'cat' terminates and I am not able so send commands afterwards.

My other try:

tail -f pipeline_name | java -jar external_application.jar

This works fine. All commands are passed to the JAVA-Application. BUT: If the java-application is terminating, the tail -f will run like before.

I need a solution where reading from the pipe is stopped if the JAVA-Process is terminating.

Thanks a lot

Upvotes: 0

Views: 1557

Answers (1)

peteches
peteches

Reputation: 3629

use bash redirection and heres a cheatsheet

java -jar external_application.jar < pipeline_name

the < means the java process will read it's stdin from pipeline_name

Upvotes: 1

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