For WDL questions, see the WDL specification and WDL docs.
For Cromwell questions, see the Cromwell docs and please post any issues on Github.
how to get a command output to the variable?
In my pipeline I sometimes just want to get the command output as an output of the task as sometimes it is just one line and writing it to the file looks like a huge overhead for me. Unfortunately in current wdl documentation I do not see how to do it.