12.4. Control bash loop with Here is a example of while loop controlled by standard input. Until the redirection chain from STDOUT to STDIN to the read command exists the while loop continues. #!/bin/bash# This bash script will locate and replace spaces # in the filenames DIR="." # C...
How to check if a directory exists? How to check if a command succeeds or failed? How to do string comparison and check if a string equals to a value? How to check if a string is in an array? How to use the Bash ternary operator? How to negate an if condition in a Bash if sta...
# Function to check if a directory exists directory_exists() { local dirname="$1" if [ -d "$dirname" ]; then echo "Directory '$dirname' exists." else echo "Directory '$dirname' does not exist." fi } # Test the directory functions create_directory "workarea_dir" directory_exists "wo...
12.4. Control bash loop with Here is a example of while loop controlled by standard input. Until the redirection chain from STDOUT to STDIN to the read command exists the while loop continues. #!/bin/bash # This bash script will locate and replace spaces # in the filenames DIR="." # ...
此方法将路径作为输入并测试用户的权限。...让我们看下面的示例,该示例使用fs.access()检查给定目录是否存在: const fs = require('fs'); // directory to check if exists const...'does not exist' : 'exists'}`); }); 查看本指南,以了解有关在Node.js应用程序中读写文件的更多信息。 11.8K1...
#ifrunning bashif[ -n"$BASH_VERSION"];then# include .bashrcifit existsif[ -f"$HOME/.bashrc"];then."$HOME/.bashrc"fifi# set PATH so it includes user's private bin directoriesPATH="$HOME/bin:$HOME/.local/bin:$PATH" 1. 2.
printf 'Username: %s, Shell: %s, Home Dir: %s/n' "$f1" "$f7" "$f6" done <"$file" 示例输出: Bash 下如何逐行读取一个文件 图01:Bash 脚本:读取文件并逐行输出文件 Bash 脚本:逐行读取文本文件并创建为 pdf 文件 我的输入文件如下(faq.txt): ...
dirExists("./myDir")Check if directory exists mkdir("./newDirName")Create a directory (recursive by default) rmdir("./newDirName")Delete a directory (recursive by default) exists("./aFile.txt")Check if a file exists rm("./myFile")Delete a file ...
Catkin tools installed successfully."fi}create_catkin_ws(){# Checkifworkspace existsif[ -e"$CATKIN_DIR/.catkin_workspace"] || [ -d"$CATKIN_DIR/.catkin_tools"]; thenecho"Catkin workspace detected at ~/catkin_ws"elseecho"Creating catkin workspace ...
持续集成和交付（CI / CD）管道旨在支持每天数以万计的部署。生产部署的频率不能以牺牲安全为代价，...