string="test string" echo "${#string}" # output: 11 str1="test_str1" str2="test_str2" str3=$str1$str2 echo "$str3" # output: test_str1test_str2 # 通过 {} 提高可读性 str4="${str1}_yes" echo "$str4" # output: test_str1_yes pos=5 len=4 echo "${str4:$pos:$le...
echo "$a : The string is not empty" else echo "$a : The string is empty" fi 结果 abc = efg: a != b -n abc : The string length is not 0 abc : The string is not empty 文件测试运算符 实例: #!/bin/bash file="/home/shiyanlou/test.sh" if [ -r $file ] then echo "The ...
本文作者:IMWeb 江源 原文出处:IMWeb社区 未经同意,禁止转载 原文条件语句和循环可以统称为流程控制,是一门语言最基础的部分。...bash 的流程控制和大家熟悉的语言非常类似,所以这块上手应该很快。条件语句条件这块建议先去瞧瞧《bash 的 Test》。bash 中的条件
- Testifa given variable is equal/not equal to the specified string: [[$variable==|!="string"]] - Testifa given string conforms the specified glob/regex: [[$variable==|=~ pattern ]] - Testifa given variable is [eq]ual/[n]ot [e]qual/[g]reater [t]han/[l]ess [t]han/[g]re...
test/[ ]基本情况 ‘test’: Check file types and compare values man test(获取帮助) test的判断表达式分为4类 string integer expression file testexits with the status determined by EXPRESSION. Placing the EXPRESSION between square brackets ([and]) is the same as testing the EXPRESSI...
if [[ ${arr[*]} == *sub_string* ]]; then printf '%s\n' "sub_string is in array." fi case模式 case "$var" in *sub_string*) # Do stuff ;; *sub_string2*) # Do more stuff ;; *) # Else ;; esac 讲解 知识点就一个,* 通配符匹配任意数量的字符(包括零个字符) 判断字符串...
PHP 中以下值得计算结果为 false: 关键字 boolean false 整型 integer 0 浮点型 double 0.0 字符串 string "" 字符串 string "0" 数组 array...array() 对象 object 空对象 php<5 null null NULL 例如 字符串"0": <?...0\" is false \r\n"; // 输出:string "0" is false } else { echo "...
/bin/bash## Script to split a string based on the delimitermy_string="Ubuntu;Linux Mint;Debian;Arch;Fedora"IFS=';'read-ramy_array<<<"$my_string"#Print the split stringfor i in "${my_array[@]}"doecho $idone 1. 2. 3. 拆分字符串的部分如下:...
$bashtest.sh Here, you can see the names displayed as we have defined them. Using the “for” Loop To Write the Contents of an Array to a Text File This scenario works well in cases where we get the output of a specific scenario in an array, and we have to output the contents of...
This guide covers the standard bash array operations and how to declare (set), append, iterate over (loop), check (test), access (get), and delete (unset) a value in an indexed bash array and an associative bash array. The detailed examples include how to sort and shuffle arrays. ...