目录
- shell脚本判断文件是否存在
- shell脚本之文件是否存在、权限校验
- 判断目录是否存在
- 判断文件是否存在
- 判断目录/文件是否存在
- 判断文件权限
- 判断文件是否属于当前用户
- 判断文件是否与当前用户相同用户组
- 比较文件之间是否为新建
- 复合条件判断文件
- 总结
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 filepat| 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我们。
