Why to Write Shell Script ?
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Shell script can take input from user, file and output them on screen.
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Useful to create our own commands.
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Save lots of time.
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To automate some task of day today life.
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System Administration part can be also automated.
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本文转自 运维天空 51CTO博客，原文链接:http://blog.51cto.com/jason83/1966085
