Linux自学第19天

echo [选项][字符串]

echo "Hello, World!"

Hello,World!

name="Linux User"echo "Welcome, $name!"

Welcome,LinuxUser!

echo This is a test

This is a test

echo -n "Loading..."echo " Done!"

Loading...Done!

echo -e "First line\nSecond line"

First lineSecond line

echo "This will be saved to file" > output.txt

echo "Additional line" >> output.txt

echo -e "\033[31mRed Text\033[0m"echo -e "\033[42;31mGreen Background with Red Text\033[0m"

echo "Today is $(date)"

Today is Wed Jul 12 14:30:22 CST 2023

echo -e "\n\033[1mSystem Menu\033[0m"echo "1. Check disk space"echo "2. List running processes"echo "3. Show system info"echo -n "Please enter your choice [1-3]: "

echo -n"Progress: ["foriin{1..20};do   echo-n"#"   sleep0.1doneecho"] Done!"

cat <<EOF | sudo tee /etc/myapp.conf# Generated by script on $(date)[Database]host = localhostport = 3306user = appuserpassword = secret123EOF

var="Hello World"echo $var    # 可能有问题，如果变量包含空格echo "$var"  # 正确方式

echo "Cost: \$100"  # 输出 $ 符号echo "Path: /usr/local/bin"  # 斜杠不需要转义