shell脚本怎样判断文件是否存在
作者:大飞飞鱼
这篇文章主要介绍了shell脚本怎样判断文件是否存在问题,具有很好的参考价值,希望对大家有所帮助。如有错误或未考虑完全的地方,望不吝赐教
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。
shell判断文件是否存在的脚本如下:
//[ 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 filepath | file exists. all files type |
-b filepath | file exists and is a block special file. |
-c filepath | file exists and is a character special file. |
-d filepath | file exists and is a directory. |
-e filepath | file exists (等同于 -a). |
-f filepath | file exists and is a regular file. |
-g filepath | file exists and has its setgid(2) bit set. |
-G filepath | file exists and has the same group ID as this process. |
-k filepath | file exists and has its sticky bit set. |
-L filepath | file exists and is a symbolic link. |
-n filepath | string length is not zero. |
-o filepath | Named option is set on. |
-O filepath | file exists and is owned by the user ID of this process. |
-p filepath | file exists and is a first in, first out (FIFO) special file ornamed pipe. |
-r filepath | file exists and is readable by the current process. |
-s filepath | file exists and has a size greater than zero. |
-S filepath | file exists and is a socket. |
-t filepath | file descriptor number fildes is open and associated with aterminal device. |
-u filepath | file exists and has its setuid(2) bit set. |
-w filepath | file exists and is writable by the current process. |
-x filepath | file 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
复合条件判断文件
#判断既是文件 又 可读 ,用 && ,或用 || file=/home/script/file.log if [ -f $file ] && [ -r $file ] then echo "文件$file是文件,并且可读=============" fi
总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。