shell脚本怎样判断文件是否存在

shell脚本判断文件是否存在

在进行linux系统相关应用程序开发时，少不了要书写一些shell脚本，有时候要用到判断文件或者目录是否存在的脚本，本文笔者做一下笔记，已备后查。

//[ 与 ] 的前后必须有空格符
if [ -f /path/file.ext ]
then
echo \”The file exist\”
else
echo \”The file doesn\’t exist\”
fi
//判断某链接是否存在
if [ -L /path/link ]
then
echo \”The link exist\”
else
echo \”The link doesn\’t exist\”
fi

其实shell对于文件册测试有好几种选项开关

现在例举如下：

表达式测试含义-a filepathfile exists. all files type-b filepathfile exists and is a block special file.-c filepathfile exists and is a character special file.-d filepathfile exists and is a directory.-e filepathfile exists (等同于 -a).-f filepathfile exists and is a regular file.-g filepathfile exists and has its setgid(2) bit set.-G filepathfile exists and has the same group ID as this process.-k filepathfile exists and has its sticky bit set.-L filepathfile exists and is a symbolic link.-n filepathstring length is not zero.-o filepathNamed option is set on.-O filepathfile exists and is owned by the user ID of this process.-p filepathfile exists and is a first in, first out (FIFO) special file ornamed pipe.-r filepathfile exists and is readable by the current process.-s filepathfile exists and has a size greater than zero.-S filepathfile exists and is a socket.-t filepathfile descriptor number fildes is open and associated with aterminal device.-u filepathfile exists and has its setuid(2) bit set.-w filepathfile exists and is writable by the current process.-x filepathfile exists and is executable by the current process.

shell脚本之文件是否存在、权限校验

判断目录是否存在

#判断目录是否存在，判断非加!号， [ ! -d \’/home\’ ]
if [ -d \’/home\’ ]
then
echo \”目录/home存在==========\”
else
echo \”目录/home不存在=========\”
fi

判断文件是否存在

#判断文件是否存在
if [ -f \’/home/docker.log\’ ]
then
echo \”文件/home/docker.log存在=============\”
else
echo \”文件/home/docker.log不存在===========\”
fi

判断目录/文件是否存在

#判断文件是否存在，目录或文件存在都成立
if [ -e \’/home\’ ]
then
echo \”/home存在==============\”
else
echo \”/home不存在============\”
fi

判断文件权限

#检测文件是否可读 -r ,可写 -w ,可执行 -x
if [ -r \’/home/script/file.log\’ ]
then
echo \”文件/home/script/file.log存在并可读==============\”
else
echo \”目录/home/script/file.log不存在或不可读==================\”
fi

判断文件是否属于当前用户

#检测文件是否属于当前用户
file_path=/home/script/file.log
if [ -O $file_path ]
then
echo \”文件$file_path属于当前用户=================\”
else
echo \”文件$file_path不属于当前用户===============\”
fi

判断文件是否与当前用户相同用户组

#检测文件是否存在，并且默认组与当前用户相同
file_path=/home/script/file.log
if [ -G $file_path ]
then
echo \”文件$file_path所属组与当前用户相同=================\”
else
echo \”文件$file_path所属组与当前用户不相同================\”
fi

比较文件之间是否为新建

#检测文件file1是否比file2新
file1=/home/script/file.log
file2=/home/script/file_1.log
if [ $file1 -nt $file2 ]
then
echo \”文件$file1比文件$file2新==============\”
fi
if [ $file1 -ot $file2 ]
then
echo \”文件$file1比文件$file2旧===============\”
fi