Redundant printing of stderr when using exec

[joelruns]

Node version (or tell us if you're using electron or some other framework):

v10.11.0

ShellJS version (the most recent version/Github branch you see the bug on):

0.8.2

Operating system:

High Sierra

Description of the bug:

When using synchronous exec for some reason after running the command, exec itself prints exec: [stderr] to console again. I have searched the documentation, the issues, and the code but can't seem to figure out how to silence this. My usage is for react-scripts test via create-react-app and linting with flow. Is it possible to stop this post-exec reprinting of stderr and if not would it be reasonable to request removing this behavior?

Using the silent option for exec does the opposite of what I want. All the output is silenced except this exec: [stderr] reprinting. Setting silent with config kills everything. This is especially troublesome with testing since test cases get printed live then after testing completes, the entire log gets printed again but prefixed with exec: .

Example ShellJS command to reproduce the error:

To illustrate if I do something stupid like:

shell.exec('cat nonexistentfile');

I get in output:

cat: nonexistentfile: No such file or directory
exec: cat: nonexistentfile: No such file or directory

[nfischer]

Known issue, duplicate of #851. Will be fixed by #861.

CC @uttpal