Use of [[ in shell scripts - not supported in sh on Ubuntu

[ninetyninereds]

On Ubuntu /bin/sh does not support [[, which is used in the shell scripts (which have a shebang pointing to /bin/sh, and are I believe also called explicitly by sh in some paces). This is similar the the old issue #261 (pushd). Possible fixes are changing the scripts, or perhaps just explicitly demanding /bin/sh points to bash.

[davidcheung]

Thanks for pointing that out, should probably just use bash so the experience is more uniform I think

related commitdev/zero/issues/261