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Use OSTYPE instead of uname in bash scripts

No need to shell out to uname for this stuff.

#!/bin/bash

if [[ "$OSTYPE" == "darwin"* ]]; then
    echo "Running on macOS"
elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
    echo "Running on Linux"
else
    echo "Unknown OS: $OSTYPE"
fi

OSTYPE¶ A string describing the operating system Bash is running on.

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