38 lines
763 B
Bash
38 lines
763 B
Bash
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#!/usr/bin/env bash
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################### 单引号和双引号 ###################
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################### 拼接字符串 ###################
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# 使用单引号拼接
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name1='white'
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str1='hello, '${name1}''
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str2='hello, ${name1}'
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echo ${str1}_${str2}
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# Output:
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# hello, white_hello, ${name1}
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# 使用双引号拼接
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name2="black"
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str3="hello, "${name2}""
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str4="hello, ${name2}"
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echo ${str3}_${str4}
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# Output:
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# hello, black_hello, black
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################### 获取字符串长度 ###################
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text="12345"
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echo ${#text}
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# Output:
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# 5
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################### 获取字符串长度 ###################
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text="12345"
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echo ${text:2:2}
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# Output:
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# 34
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################### 查找子字符串 ###################
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text="hello"
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echo `expr index "${text}" ll`
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# Output:
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# 3
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