I accidentially copied my whole home directory into one of my subdirectories, causing me to exceed my disk quota on a server.
Or does anyone know how to undo a command in general?
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Bash is just a command-line interpreter - it does what you tell it to do and doesn't have an undo helper program. You're best of just deleting the subdirectory with something like:
chmod -R 775 ~/yoursubdir && rm -rf ~/yoursubdir
I'm pretty sure there's no such thing. If there was, that would be pretty interesting.
For your case you can just remove the subdirectory
rm -rf /path/to/subdirectory
But be careful with that command, as it can fully delete any files from the sub-directory without any confirmation. ;)
When it comes to the shell, you are the undo. The opposite of copying is deleting (rm), so delete the copies.
I recommend installing the trash-cli package, and then setting these Bash aliases:
alias rm='trash' alias rrm='rm -i'
Of course, in your case, since you're out of disk space, you probably don't want to trash the files first. Even so, it's a good practice to use the trash.