shell脚本编程进阶

shell脚本编程进阶:

    -d:确定文件是否为目录    -f:确定文件是否为普通文件    -e:确定文件是否存在    -r:确定文件是否可读    -w:确定文件是否可写    -x:确定文件是否可执行    -s:确定文件名长度是否大于零

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

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    #!/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 ""

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    #!/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

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    #!/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!反转倒置字符串！"

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    #!/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

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    sh [选项]  [文件]:        -n:检查shell脚本语法错误，如果没错误就没有输出信息        -x:显示脚本实际执行过程    sh  -x ./test.sh

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

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    #!/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      #检查过滤 #checkLoginIP.sh

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    #!/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