mirror of
https://github.com/dunwu/linux-tutorial.git
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108 lines
2.3 KiB
Bash
108 lines
2.3 KiB
Bash
#!/usr/bin/env bash
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################### 使用单引号拼接字符串 ###################
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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, ${name1}
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################### 使用双引号拼接字符串 ###################
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name2="black"
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str3="hello, "${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} length is: ${#text}"
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# Output:
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# 12345 length is: 5
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# 获取子字符串
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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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################### 判断字符串中是否包含子字符串 ###################
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result=$(echo "${str}" | grep "feature/")
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if [[ "$result" != "" ]]; then
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echo "feature/ 是 ${str} 的子字符串"
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else
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echo "feature/ 不是 ${str} 的子字符串"
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fi
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################### 截取关键字左边内容 ###################
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full_branch="feature/1.0.0"
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branch=`echo ${full_branch#feature/}`
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echo "branch is ${branch}"
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################### 截取关键字右边内容 ###################
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full_version="0.0.1-SNAPSHOT"
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version=`echo ${full_version%-SNAPSHOT}`
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echo "version is ${version}"
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################### 字符串分割成数组 ###################
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str="0.0.0.1"
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OLD_IFS="$IFS"
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IFS="."
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array=( ${str} )
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IFS="$OLD_IFS"
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size=${#array[*]}
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lastIndex=`expr ${size} - 1`
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echo "数组长度：${size}"
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echo "最后一个数组元素：${array[${lastIndex}]}"
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for item in ${array[@]}
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do
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echo "$item"
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done
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################### 判断字符串是否为空 ###################
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#-n 判断长度是否非零
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#-z 判断长度是否为零
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str=testing
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str2=''
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if [[ -n "$str" ]]
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then
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echo "The string $str is not empty"
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else
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echo "The string $str is empty"
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fi
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if [[ -n "$str2" ]]
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then
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echo "The string $str2 is not empty"
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else
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echo "The string $str2 is empty"
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fi
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# Output:
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# The string testing is not empty
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# The string is empty
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################### 字符串比较 ###################
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str=hello
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str2=world
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if [[ $str = "hello" ]]; then
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echo "str equals hello"
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else
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echo "str not equals hello"
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fi
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if [[ $str2 = "hello" ]]; then
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echo "str2 equals hello"
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else
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echo "str2 not equals hello"
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fi
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