shell腳本編程進階

shell腳本編程進階:

    -d:確定文件是否爲目錄
    -f:確定文件是否爲普通文件
    -e:確定文件是否存在
    -r:確定文件是否可讀
    -w:確定文件是否可寫
    -x:確定文件是否可執行
    -s:確定文件名長度是否大於零

---

    #!/bin/bash
    if [ -d $1 ]
    then
        ls $1
    else 
        echo "$1 is not a directory"
    fi  
    #保存,isadir.sh。source  isadir.sh  ~

---

    #!/bin/bash
    case "$1" in
        [A-Z]|[a-z])
            echo "letter";;
        [0-9])
            echo "digit";;
        *)
            echo "other symbol";;
    esac 
    #->iscase.sh #source iscase.sh hello  #source iscase.sh ""

---

    #!/bin/bash
    for var in hello world !
    do 
        echo $var
    done #hello.sh

    #!/bin/bash
    for((i=0;i<5;i++))
    do 
        echo $i
    done  #iValue.sh

---

    #!/bin/bash
    index=`expr length "$1"`
    while [ $index -gt 0 ]
    do
        str=$str `expr substr "$1" $index 1`
        index =$[$index-1]
    done 
    echo $str 
    #->whileShell.sh 
    #source whileShell.sh "HelloWorld!反轉倒置字符串！"

---

    #!/bin/bash
    for var in Jack Hose Mark Hellen
    do 
        if [ $var = Mark ]
        then 
            break;
        fi
        echo $var
    done
    echo -e "---------------------------------------------------\n"
    for var in Jack Hose Mark Hellen
    do 
        if [ $var = Mark ]
        then
            continue;
        fi
        echo $var
    done 
    #test.sh #source test.sh

---

    sh [選項]  [文件]:
        -n:檢查shell腳本語法錯誤，如果沒錯誤就沒有輸出信息
        -x:顯示腳本實際執行過程
    sh  -x ./test.sh

---

    #!/bin/bash
    if [! $# -eq 2]
    then 
        echo "please input two parameters"
        exit
    fi
    #divideNew.sh

---

    #!/bin/bash
    count=`who | grep "\(192\.168\.126\.[1-9][0-9]*\)" | wc -l`
    if [ $count -gt 0 ]
    then 
        date>> checkLoginIP.log
        echo `who | grep "\(192\.168\.126\.[1-9][0-9]*\)" `>>checkLoginIP.log
    fi  
    #檢查過濾 #checkLoginIP.sh

---

    #!/bin/bash
    if[ $# -ne 1 ]
    then
        echo "please input the backup directory"
        exit
    fi
    filelist=`ls $1`
    backupdir=$HOME/backup`date"+%Y%m%d%H%M%S"`
    mkdir $backupdir
    echo "now start backuping,the directory name  is $backupdir"
    for filename in $filelist
    do
        if [ -f "$1/$filename" ]&&[ -x "$1/$filename" ]
        then 
            cp "$1/$filename"  "$backupdir/$filename"
        fi
    done
    #backupDir.sh