shell判断文件或文件夹是否存在

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shell命令判断文件或文件夹是否存在，先直接看实例：

#!/bin/sh

#判断文件存在，判断是否为文件夹等
testPath="/Volumes/MacBookProHD/Mr.Wen/08 shell命令"
testFile="/Volumes/MacBookProHD/Mr.Wen/08 shell命令/fileWen"

#判断文件夹是否存在 -d
if [[ ! -d "$testPath" ]]; then
    echo "文件夹不存在"
else
    echo "文件夹存在"
fi

#判断文件夹是否存在，并且具有可执行权限
if [[ ! -x "$testFile" ]]; then
    echo "文件不存在并且没有可执行权限"
else
    echo "文件存在并有可执行权限"
fi

#判断文件是否存在
if [[ ! -f "$testFile" ]]; then
    echo "文件不存在"
else
    echo "文件存在"
fi
在shell命令脚本编写当中，会遇到各种对文件的判断，除了以上常用的判断，还有其他的可以使用，如下：

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.