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这里介绍了bash中常用的字符串的操作,包括替换,截断
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str="test.tar.gz"
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echo ${str} #output ==> test.tar.gz
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echo ${str:5} # output ==> tar.gz
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echo ${str:5:3} #output ==> tar
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echo ${str/test/another_test} #output ==> another_test.tar.gz
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echo ${str#*.} ==> output ==> tar.gz
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echo ${str##*.} ==> output ==> gz
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