Re: How to trim a path and just leave last n levels?

[Andreas Kusalananda Kähäri]

On Tue, Apr 14, 2020 at 09:22:17AM -0500, Peng Yu wrote:
> Hi,
> 
> basename just leaves the last level in a path. Is there a good way to
> leave the last two levels or the last n levels of a path? Thanks.
> 
> -- 
> Regards,
> Peng

What you're asking about is the equivalent of zsh's %d (or %/) prompt
format string which could be used for this (well, for the current
working directory at least):

$ pwd
/tmp/shell.DAd5JbZC/dir1/dir2
$ print -P '%2d'
dir1/dir2

The naive way would be to remove the prefix string from the path that
matches everything but the last two directory level:

$ pwd
/tmp/shell.DAd5JbZC/dir1/dir2
$ printf '%s\n' "${PWD#${PWD%/*/*}/}"
dir1/dir2

This would only work if the path contains at least two levels though,
and hard-codes the number of levels that you'd want leave.


-- 
Andreas (Kusalananda) Kähäri
SciLifeLab, NBIS, ICM
Uppsala University, Sweden

.