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Hello! If this is the wrong subforum to post things like these in then I kindly apologize for the inconvenience. On to the point, I've been working on a script and have run into an issue at the last step, creating a custom directory for the .exe to run from.
This is probably a silly question and really easy to do, but I'm not particularly literate within the subject and can't get it to work.

After having made a prefix I'm trying to create a directory in the Program Files folder of it, and the issue is that cd doesn't want to change the directory without the "home/user/" part in front of .PlayOnLinux/wineprefix/newprefix/drive_c/Program Files". If I specify "home/boat" then everything works, but without nothing happens, and this is probably expected behaviour, but I don't really know any other way to do this in. Any help would be appreciated, thank you.

Edit: Additionally, the new directory requires an exclamation mark in the name. I couldn't get this to work either and would highly appreciate any suggestions for a solution to this. Thanks.

Another edit: I sorted it out. I missed the part about $HOME, got it working now. Thank you anyways! :^D

Edited by boat

Talking about that, don't expect PlayOnLinux to live in $HOME/.PlayOnLinux, use $POL_USER_ROOT; Don't expect prefixes to live in $POL_USER_ROOT/wineprefix, use $WINEPREFIX (set once the prefix has been selected); And don't expect "Program Files" to be named that way, as it depends on the locale, use $PROGRAMFILES instead.

Thank you, I fixed this. 

Edited by boat

So after changing it to

cd "$POL_USER_ROOT/$WINEPREFIX/osu_on_linux/drive_c/$PROGRAMFILES"
  
mkdir "osu!"
  
cd "$POL_USER_ROOT/$WINEPREFIX/osu_on_linux/drive_c/$PROGRAMFILES/osu!"
  
POL_Download http://osu.ppy.sh/release/osume.exe

And having it working for a while, it suddenly stopped doing so. I'm not sure what the issue here is.

$WINEPREFIX points to the root of the Wine prefix, so you just need
mkdir "$WINEPREFIX/drive_c/$PROGRAMFILES/osu!"
cd "$WINEPREFIX/drive_c/$PROGRAMFILES/osu!" || POL_Debug_Fatal "Failed to change directory"

cd then mkdir is bad style: if the cd fails (because the path doesn't exist or for whatever other reason, access rights, etc.) you'll be creating a subdirectory in the current directory, which can be almost anything...