command line - GO: {GOOS} and {GOARCH} not recognised in environment -

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i want change diretory go/pkg/darwin_amd64 $ cd $gopath/pkg/${goos}_${goarch} doesn't find folder though directory exists.

$ echo $gopath/pkg/${goos}_${goarch} gives /go/pkg/_ instead of /go/pkg/darwin_amd64.

$ go env prints: 

goarch="amd64" gobin="" gochar="6" goexe="" gohostarch="amd64" gohostos="darwin" goos="darwin" gopath="/users/sahilkapoor/go" gorace="" goroot="/usr/local/go" gotooldir="/usr/local/go/pkg/tool/darwin_amd64" cc="clang" gogccflags="-fpic -m64 -pthread -fno-caret-diagnostics -qunused-arguments -fmessage-length=0 -fno-common" cxx="clang++" cgo_enabled="1"

we can see goos , goarch defined here. using terminal on mac osx 10.10.3. missing?

$goos , $goarch defined in shell if have exported them (which, unless doing cross compilation, unlikely).

when run go env, default values shown when have not been overwritten environment. should change command following desired results:

cd $(go env gopath)/pkg/$(go env goos)_$(go env goarch)

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