How to write to stderr in Nim?

Question

I know there is echo, which writes to stdout. Is it possible to redirect echo to stderr, or is there another way to write to stderr?

Answer 1

It is not possible to redirect echo, but the same can be achieved by using writeLine on the stderr handle (no special imports required):

stderr.writeLine("Error: ", 42)

Documentation links:

• writeLine in streams module
• stderr in system module

Answer 2

Another way is to call writeLine. It is listed among the system Exports. The docs for echo suggest also calling flushFile as below.

writeLine(stderr, "my err")
flushFile(stderr)

This was tested with Nim 1.4.2.