Linux uses if to determine whether an instance exists in a directory.

How Linux uses if to determine whether a directory exists

The methods are as follows:

1. The method of judging the existence of a directory by using if in the script

#! / bin/bashif [- d "c"]; then echo "directory c exists" else echo "directory does not exist" fi

2. Simple and convenient writing method

#! / bin/bash [- d "c"] & & echo "directory c exists" # or [- d "d"] | | echo "directory d does not exist"

More judgment formats are as follows:

-e filename true if filename exists

-d filename true if filename is a directory

-f filename true if filename is a regular file

-L filename true if filename is a symbolic link

-r filename true if filename is readable

-w filename true if filename is writable

-x filename true if filename is executable

-s filename true if the file length is not 0

-h filename true if the file is a soft link

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