[shell script] 변수와 환경변수

http://happyoutlet.tistory.com/entry/%EC%9C%A0%EB%8B%89%EC%8A%A4%EB%A6%AC%EB%88%85%EC%8A%A4%EC%9D%98-%EC%89%98%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8-%ED%99%98%EA%B2%BD%EB%B3%80%EC%88%98

https://help.ubuntu.com/community/EnvironmentVariables

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