IntroductionIn Bash scripting, checking if a file exists is a common task that programmers encounter daily. Whether you’re automating workflows, validating inputs, or handling errors, knowing how to perform this check efficiently is essential. This guide will walk you through the best methods to check if a file exists in Bash, complete with practical examples and tips.
Methods to Check if a File Exists in Bash1. Using the -e FlagThe -e flag checks if a file exists, regardless of its type (file ...
share
未读
How to Exit TmuxExiting Tmux is straightforward once you understand its key bindings and commands. Here are the most common methods:
Method 1: Exiting Tmux with a ShortcutTmux uses key bindings to manage sessions. The default prefix key is Ctrl + b (hold down the Ctrl key and press b). To exit Tmux, follow these steps:
Press Ctrl + b to activate the Tmux prefix.
Immediately press d (for “detach”).
This command detaches your current Tmux session but keeps it running in the background. You can ...
IntroductionRunning Bash scripts is a fundamental skill for Linux users, especially programmers and system administrators. Whether you’re automating tasks, deploying applications, or managing servers, knowing how to execute Bash scripts efficiently is essential. This guide will walk you through the steps to run a Bash script in Linux, along with practical examples and tips.
What is a Bash Script?A Bash script is a text file containing a series of commands that are executed by the Bash shell. I ...
Installing Tmux on LinuxTmux can be installed on Linux using the package manager specific to your distribution. Below are the installation commands for popular Linux distributions:
Distribution
Command
Debian/Ubuntu
sudo apt update && sudo apt install tmux
Fedora
sudo dnf install tmux
CentOS/RHEL
sudo yum install epel-release && sudo yum install tmux
Arch Linux
sudo pacman -S tmux
openSUSE
sudo zypper install tmux
Alpine Linux
sudo apk add tmux
Insta ...
生活记录
未读
组合 = 避险资产（黄金）+ 周期资产（商品）+ 成长资产（科技股）+ 稳健资产（金融债）
自选
黄金ETF
属性：避险资产，抗通胀工具，与股市/债市相关性低
适用场景：地缘政治风险、货币贬值、经济衰退预期
商品基金
属性：大宗商品（能源、工业金属、农产品等），周期性强，波动较高
适用场景：通胀上行周期、全球经济复苏期
纳斯达克
属性：高成长性科技企业，长期增长潜力大，但估值波动剧烈
适用场景：经济扩张期、利率稳定或下行期
政策性金融债
属性：低风险利率债，信用风险极低，收益稳定
适用场景：市场动荡期、流动性管理、收益“压舱石”
风险偏好方案一：稳健
基金
占比
政策性金融债
50%
黄金ETF
20%
纳斯达克精选
20%
全球商品基金
10%
方案二：平衡
基金
占比
政策性金融债
30%
黄金ETF
20%
纳斯达克精选
30%
全球商品基金
20%
方案三：激进
基金
占比
政策性金融债
10%
黄金ETF
20%
纳斯达克精选
40%
全球商品基金
30%
...
Step-by-Step Guide to Add Homebrew to PATHStep 1: Verify Homebrew InstallationFirst, check if Homebrew is installed correctly by running:
1brew --version
If you see the version number, Homebrew is installed. If you get a “command not found” error, you may need to reinstall Homebrew.
Step 2: Determine Your ShellCheck which shell you are using by running:
1echo $SHELL
Common shells include /bin/zsh (default on newer macOS versions) and /bin/bash.
Step 3: Update Shell Configuration FileDepending ...
Step-by-Step Guide to Uninstall HomebrewStep 1: Run the Uninstall ScriptHomebrew provides an official uninstall script that removes most of its files and configurations. Open your Terminal and run the following command:
1/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)"
This script will prompt you to confirm the uninstallation. Type y and press Enter to proceed.
Step 2: Verify the UninstallationAfter running the uninstall script, check i ...
btop vs htop: Which System Monitoring Tool Should Programmers Choose?When it comes to system monitoring tools, htop has long been a favorite among programmers and system administrators. However, btop has emerged as a modern alternative, offering a visually appealing interface and advanced features. In this blog, we’ll compare btop vs htop, highlighting their strengths, weaknesses, and use cases to help you decide which tool is best for your needs.
What is htop?htop is an interactive process vie ...
htop vs top: Which System Monitoring Tool Should Programmers Choose?
Introduction:When it comes to monitoring system performance on Linux, two tools stand out: htop and top. Both are widely used by programmers and system administrators, but they cater to different needs. In this blog, we’ll compare htop vs top, highlighting their strengths, weaknesses, and practical use cases to help you decide which tool is best for your workflow.
What is top?top is a classic command-line tool for real-time sy ...
Method 1: Using the Command Line
Open the Terminal: Press Ctrl + Alt + T or search for “Terminal” in the applications menu.
Run the Command: Type the following command and press Enter:1lsb_release -a
View the Output: You’ll see details like the Distributor ID, Description (Ubuntu version), Release, and Codename.
12345No LSB modules are available.Distributor ID: UbuntuDescription: Ubuntu 20.04.2 LTSRelease: 20.04Codename: focal
Method 2: Using the GUI
Open Settings: Click on the ...
