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    判断文件是否存在的shell脚本代码

    实现代码一、

    #!/bin/sh
    # 判断文件是否存在
    # link:www.jb51.net
    # date:2013/2/28
    
    myPath="/var/log/httpd/"
    myFile="/var /log/httpd/access.log"
    
    # 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限
    if [ ! -x "$myPath"]; then
     mkdir "$myPath"
    fi
    # 这里的-d 参数判断$myPath是否存在
    if [ ! -d "$myPath"]; then
     mkdir "$myPath"
    fi
    
    # 这里的-f参数判断$myFile是否存在
    if [ ! -f "$myFile" ]; then
     touch "$myFile"
    fi
    # 其他参数还有-n,-n是判断一个变量是否是否有值
    if [ ! -n "$myVar" ]; then
     echo "$myVar is empty"
     exit 0
    fi
    
    # 两个变量判断是否相等
    if [ "$var1" = "$var2" ]; then
     echo '$var1 eq $var2'
    else
     echo '$var1 not eq $var2'
    fi

    实现代码二、

    #shell判断文件夹是否存在
    
    #如果文件夹不存在,创建文件夹
    if [ ! -d "/myfolder" ]; then
     mkdir /myfolder
    fi
    
    #shell判断文件,目录是否存在或者具有权限
    
    folder="/var/www/"
    file="/var/www/log"
    
    # -x 参数判断 $folder 是否存在并且是否具有可执行权限
    if [ ! -x "$folder"]; then
     mkdir "$folder"
    fi
    
    # -d 参数判断 $folder 是否存在
    if [ ! -d "$folder"]; then
     mkdir "$folder"
    fi
    
    # -f 参数判断 $file 是否存在
    if [ ! -f "$file" ]; then
     touch "$file"
    fi
    
    # -n 判断一个变量是否有值
    if [ ! -n "$var" ]; then
     echo "$var is empty"
     exit 0
    fi
    
    # 判断两个变量是否相等
    if [ "$var1" = "$var2" ]; then
     echo '$var1 eq $var2'
    else
     echo '$var1 not eq $var2'
    fi

    -f 和-e的区别

    Conditional Logic on Files

    -a file exists.

    -b file exists and is a block special file.

    -c file exists and is a character special file.

    -d file exists and is a directory.

    -e file exists (just the same as -a).

    -f file exists and is a regular file.

    -g file exists and has its setgid(2) bit set.

    -G file exists and has the same group ID as this process.

    -k file exists and has its sticky bit set.

    -L file exists and is a symbolic link.

    -n string length is not zero.

    -o Named option is set on.

    -O file exists and is owned by the user ID of this process.

    -p file exists and is a first in, first out (FIFO) special file or

    named pipe.

    -r file exists and is readable by the current process.

    -s file exists and has a size greater than zero.

    -S file exists and is a socket.

    -t file descriptor number fildes is open and associated with a

    terminal device.

    -u file exists and has its setuid(2) bit set.

    -w file exists and is writable by the current process.

    -x file exists and is executable by the current process.

    -z string length is zero.

    是用 -s 还是用 -f 这个区别是很大的!

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    判断文件是否存在的shell脚本代码 判断,文件,是否,存,在的,