2019-05-10 11:17:57 +08:00
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#!/bin/bash
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2019-10-10 08:56:31 +08:00
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2019-05-10 11:17:57 +08:00
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# 大于小于号必须转义,否则shell会将它们当做重定向符号而把字符串值当做文件名处理
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# 大于小于号顺序和sort命令所采用的有所不同
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# mis-using string comparisons
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val1=baseball
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val2=hockey
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2019-10-15 14:17:17 +08:00
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################### 错误使用大于小于号 ##################
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if [[ $val1 > $val2 ]]
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2019-05-10 11:17:57 +08:00
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then
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2019-10-10 08:56:31 +08:00
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echo "$val1 is greater than $val2"
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2019-05-10 11:17:57 +08:00
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else
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2019-10-10 08:56:31 +08:00
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echo "$val1 is less than $val2"
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2019-05-10 11:17:57 +08:00
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fi
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2019-10-15 14:17:17 +08:00
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################### 正确使用大于小于号 ###################
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if [[ $val1 \> $val2 ]]
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then
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echo "$val1 is greater than $val2"
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else
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echo "$val1 is less than $val2"
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fi
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