Shell determines whether a file or folder exists

Shell command to determine whether a file or folder exists, first look directly at the example:

#!/bin/sh

#判断文件存在 to determine if the folder
testpath= "/volumes/macbookprohd/mr.wen/08 shell command"
testfile=/volumes/ macbookprohd/mr.wen/08 shell command/filewen "

#判断文件夹是否存在-D
if [[!-D" $testPath "]]; then
	echo" folder does not exist "
else
	echo "folder exists"
fi

#判断文件夹是否存在 with executable permission
if [[!-X ' $testFile]]; then
	echo ' file does not exist and does not have executable permissions ' C12/>else
	echo "file exists and has executable permissions"
fi

#判断文件是否存在
if [[!-f ' $testFile ']]; then
	echo "file does not exist"
else
	echo "file exists"
fi

In the shell command script, you will encounter a variety of documents to judge, in addition to the above commonly used judgments, there are other can be used, as follows:

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-a-a-in-a-a-i-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.