Hi,

I want to run an external command in Julia. Should a command fail I want to 
get the message from the external command.

I know failed commands raise a general exception that can be caught:

*run(`dat hi`)*

dat: hi is not a valid command

*ERROR: failed process: Process(`dat hi`, ProcessExited(1)) [1]*

* in run at ./process.jl:490*

I see that a message is printed out by the external program:

dat: hi is not a valid command.

However readall() does not get this message and return it as a string:

*readall(`dat hi`)*

dat: hi is not a valid command

*ERROR: failed process: Process(`dat hi`, ProcessExited(1)) [1]*

* in readbytes at process.jl:474*

* in readall at process.jl:479*

Is there a way I can capture this message at all and report it back to the 
user as part of a try-catch upon catching of the ProcessExited(1) exception?

Thanks,
Ben.

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