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if [ -d "/usr/local/go" ]; then
    export PATH=$PATH:/usr/local/go/bin
    export GOPATH=~/.go
else
    export GOROOT=~/.go/golang
    # export GOROOT=/usr/lib/go
fi

if [ -n "$GOPATH" ]; then
    export GOBIN=$GOPATH/bin
fi

if [ -n "$GOROOT" ]; then       # use `-n`, or `! -z`.
    export PATH=$PATH:$GOROOT/bin
fi