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

    #!/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!反转倒置字符串！"

    #!/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 [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

    #!/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  
#检查过滤 #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

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shell脚本编程进阶

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