For example, this simple script with an if conditional checks to see whether the script’s first argument is hi: Bourne shell 具有特殊的条件构造,如 if/then/ else 和 case 语句。 例如,这个带有 if 条件的简单脚本会检查脚本的第一个参数是否为 hi:
首先,安装需要运行TypeScript代码的依赖: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 npm install--save-dev typescript ts-node ts-node包提供了一个TypeScript执行引擎,让我们能够转译和运行TypeScript代码。 需要创建tsconfig.json文件包含下面的配置: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
The“$#”variable stores the number of input arguments passed to a script. If the script expects at least one input argument, we can check if the“$#”variable is greater than zero. Here is an example code to check if at least one input argument exists using the“$#”variable: #!/bi...
[root@centos8 ~/script]#cat checkping.sh#!/bin/bash#[$#-ne 1 ] && {echo"Usage:$0IP";exit0; } ping -c1 -W1$1&>/dev/null &&echo"$1is up"|| {echo"$1is down";exit; }# 如果&& 和 || 混合使用,&& 要在前,|| 放在后echo"Scripts is finished"[root@centos8 ~/script]#bash ...
// If script block exists, see if this line matches any // of the match patterns. else { int patternIndex = 0; while (patternIndex < patterns.Length) { if ((simpleMatch && wildcardPattern[patternIndex].IsMatch(line)) || (regexPattern != null && regexPattern[patternIndex].IsM...
if test -r "$new_filename" then echo "$0: $new_filename exists" 1>&2 elif test -e "$filename" then mv "$filename" "$new_filename" else echo "$0: $filename not found" 1>&2 fi done 2. 看网站 Watch a Website A script to repeated download a webpage until it matches a ...
Returns aShellStringcontaining the given file, or a concatenated string containing the files if more than one file is given (a new line character is introduced between each file). cd([dir]) Changes to directorydirfor the duration of the script. Changes to home directory if no argument is ...
cp myscript 然后再插入自己的函数。 让我们再看两个例子: 二进制到十进制的转换 脚本b2d 将二进制数 (比如 1101) 转换为相应的十进制数。这也是一个用expr命令进行数学运算的例子: #!/bin/sh # vim: set sw=4 ts=4 et: help() { cat < b2h -- convert binary to decimal USAGE: b2h [-h] ...
--info-script=名称, --new-volume-script=名称 在每卷磁带最后运行脚本(隐含 -M) -L, --tape-length=NUMBER 写入 NUMBER × 1024 字节后更换磁带 -M, --multi-volume 创建/列出/解压多卷归档文件 --rmt-command=COMMAND 使用指定的 rmt COMMAND 代替 rmt --rsh-command=COMMAND 使用远程 COMMAND 代替 ...
Check if a command exists: console.log(await $.commandExists("deno")); console.log($.commandExistsSync("deno")); Attempting to do an action until it succeeds or hits the maximum number of retries: await $.withRetries({ count: 5, // you may also specify an iterator here which is usef...