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What is the difference between dired-tree-up and dired-up-directory?

What is the difference between dired-tree-up and dired-up-directory?

It took me a while to figure out how to go up a directory in dired. If I run dired-tree-up, I get the following error:

Asked by: Guest | Views: 67
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Guest [Entry]

"dired-up-directory

Run Dired on parent directory of current directory.
Find the parent directory either in this buffer or another buffer.
Creates a buffer if necessary.

dired-tree-up

Go up ARG levels in the dired tree.

The main difference between the two is one acts upon a dired-tree, the other upon a directory. A dired tree is made when you visit multiple directories which are connected to each other. The dired-tree up will work if you have previously visited that parent directory and haven't killed off that buffer. The dired-up-directory should always work since it acts upon the directory itself, think of it as doing a 'find-file on $PWD/..'."