_repeat() { #@ USAGE: _repeat string number _REPEAT=$1 while (( ${#_REPEAT} < $2 )) ## Loop until string exceeds desired length do _REPEAT=$_REPEAT$_REPEAT$_REPEAT ## 3 seems to be the optimum number done _REPEAT=${_REPEAT:0:$2} ## Trim to desired length } repeat() { ...
string 引用最近的以 string 开始的命令。 !?string[?] 引用 最近的包含 string 的命令。尾部的 ? 可以被忽略,如果 string 之后紧接着一个新行符。 ^string1^string2^ 快速替换。重复上一条命令,将 string1 替换为 string2. 与 ‘‘!!:s/string1/string2/’’ 等价 (参见下面的 修饰符 (Modifiers))。
${parameter:offset} ${parameter:offset:length} Substring Expansion(子字符串擴展)。 擴展為parameter 的最多 length 個字符,從 offset 指定的字符開 始。如果忽略了 length,擴展為 parameter 的子字符串, 從 offset 指定的字符串開始。length 和offset 是算術表達式 (參見下面的 ARITHMETIC EVALUATION 算術求值 ...
(String[] args...) { // 1、声明数组 int[] array = null; // 2、创建数组 array = new int[10]; // 3、给数组元素中赋值 for (int i = 0; i array...[i] = i; } // 1、静态初始化:创建 + 赋值 int[] array2 = {0,1,2,3}; // 2、动态初始化:先创建再赋值 int[] array...
${parameter:offset} ${parameter:offset:length} Substring Expansion(子字符串擴展)。 擴展爲parameter 的最多 length 個字符,從 offset 指定的字符開 始。如果忽略了 length,擴展爲 parameter 的子字符串, 從 offset 指定的字符串開始。length 和offset 是算術表達式 (參見下面的 ARITHMETIC EVALUATION 算術求值 ...
NSString *string = result; NSString *substring = @"Caddy 2 serving static files on :2015"; if ([string rangeOfString:substring].location != NSNotFound) { NSLog(@"Yes it does contain that substring"); } else if ([string rangeOfString:substring].location == NSNotFound) { NSLog(@"No ...
Use regex on a stringThe result of bash's regex matching can be used to replace sed for a large number of use-cases.CAVEAT: This is one of the few platform dependent bash features. bash will use whatever regex engine is installed on the user's system. Stick to POSIX regex features if...
5768. How can I get the directory where a Bash script is located from within the script itself? 3214. How to check if a string contains a substring in Bash. Shell Scripting Shift Through Parameters The Shift command command is a pre-installed feature that accepts a numerical value...
49 echo "Testing \"xyz\""50 if [ xyz ] # 字符串51 then52 echo "Random string is true."53 else54 echo "Random string is false."55 fi # Random string is true.56 57 echo58 59 echo "Testing \"\$xyz\""60 if [ $xyz ] # 测试$xyz是否为null,但是...(明显没人定义么!)...
The shell parameter expansions works on arrays which means that you can use the substring Expansion ${string:<start>:<count>} notation to get a subset of an array in bash. Example: ${myArray[@]:2:3}. The notation can be use with optional <start> and <count> parameters. The ${myAr...