#!/bin/bash
sum(){
read -p "請輸入第一數(shù)：" num1
read -p "請輸入第二數(shù)：" num2
echo " 你輸入的兩個數(shù)：$num1 和 $num2 "
SUM=$(($num1+$num2))
echo "兩個數(shù)的和為：" $SUM
}
sum

show_params() {
    echo "第一個參數(shù): $1"
    echo "第二個參數(shù): $2"
    echo "第十個參數(shù): ${10}"  # 注意大括號
    echo "參數(shù)總數(shù): $#"
    echo "所有參數(shù): $@"
}
show_params 1 2 3 4 5 6 7 8 9 10 11

#!/bin/bash
getMax()
{
if [ $1 -lt $2 ]; then
   return $2
else
   return $1;
fi
}
echo "Shell程序中傳遞的兩個參數(shù)是：$1 , $2"
getMax $1 $2
echo "最大值：：$?"   # $?表示返回值

files=(*.txt)  # 將當(dāng)前目錄所有txt文件存入數(shù)組
echo "第一個文件: ${files[0]}"
echo "文件總數(shù): ${#files[@]}"
# 遍歷數(shù)組
for file in "${files[@]}"; do
    echo "處理文件: $file"
done

declare -A colors  # 聲明關(guān)聯(lián)數(shù)組
colors["red"]="#FF0000"
colors["green"]="#00FF00"
echo "紅色代碼: ${colors[red]}"

# 查找包含"error"或"warning"的行
grep -E 'error|warning' log.txt  #-E 可以識別正則表達(dá)式的元字符
|表示為或
# 提取郵箱地址
grep -E -o '\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b'  emails.txt

#!/bin/bash
analyze_logs() {
    # 統(tǒng)計訪問量TOP10 IP
    awk '{print $1}' access.log | sort | uniq -c | sort -nr | head -10
    # 統(tǒng)計HTTP狀態(tài)碼
    awk '{print $9}' access.log | sort | uniq -c
    # 查找錯誤請求
    awk '$9 ~ /^[45]/ {print $0}' access.log
}
analyze_logs

#!/bin/bash
batch_rename() {
    for file in *.$1; do
        mv "$file" "${file%.*}.$2"
    done
}
batch_replace() {
    find . -type f -exec sed -i "s/$1/$2/g" {} +
}
# 使用示例
# batch_rename txt md
# batch_replace "old_text" "new_text"