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apache-karafjline

How do I use conditional operator shell:if in karaf / jline

I am trying to conditionally execute a command using the apache karaf command line, which uses the jline library.

I can't find any documentation on the shell:if command.

For example in linux shell this works:

if [ "foo" = "foo" ]; then echo "good"; fi

When I change the syntax for karaf to:

if [ "foo" = "foo" ] echo "good"

I get the error:

Error executing command shell:if: unable to convert argument condition with value '{foo=foo}' to type org.apache.felix.service.command.Function

I've tried a bunch of different syntax, but I can't figure it out.

Solution

  • Condition syntax works like this:

    >if {true} {echo yes} {echo no}
yes
> if {false} {echo yes} {echo no}
no

    This command uses closures for each part. This allows you to put an if inside of an each, for example.