How to express relative paths in Linux

For example, if your current path is /var/log and you want to go to the /usr directory, you can execute the following command:

cd ../../usr #Use the relative path to first exit to the /var directory, then exit to /, and finally enter /usr

The paths are relative to the current directory.

../ # indicates the parent directory

./ # indicates the current directory

./XXX # indicates the XXX file or XXX directory in the current directory

Using relative paths does not necessarily require backing into a directory.

If the current path is /var/log, you want to go to /var/run/

cd ../run #First exit to the /var directory, then enter the run directory under the /var directory

Knowledge point expansion:

Uses of relative paths

So what's the big deal about relative paths and absolute paths? drink! That's really amazing! Suppose you have written a software that requires three directories, namely etc, bin, and man. However, different people like to install the software in different directories. Suppose Person A installs the software in /usr/local/packages/etc, /usr/local/packages/bin, and /usr/local/packages/man, but Person B likes to install the software in /home/packages/etc, /home/packages/bin, and /home/packages/man. If absolute paths are required, will it be troublesome? Yes! In this way, it is difficult to match the contents in each directory! At this time, the writing of relative paths is particularly important!

In addition, if you are like me, and like to write long path names so that you know what the directory is for, for example: the directory /cluster/raid/output/taiwan2006/smoke, and another directory is /cluster/raid/output/taiwan2006/cctm, then if I want to go from the first to the second directory, how should I write it more conveniently? Of course cd.../cctm is more convenient! Right!

Purpose of absolute path

However, regarding the correctness of the file name, "the accuracy of the absolute path is better~". Generally speaking, I would recommend that you use absolute paths when writing shell scripts to manage your system. How to say it? Although it is more troublesome to write an absolute path, it is certain that there will be no problem with this writing method. If you use relative paths in your program, some problems may occur due to the different working environments you are running in.

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