AFAIK there's no easy way to tell what packages have been installed, but you can use the common navigational commands to get around and look at stuff.
ls (LS) will show the contents of the current directory.
chdir (CHDIR) or cd (CD) will change your directory to whatever you specify.
pwd (PWD) shows you what directory you're in.
mkdir (MKDIR) lets you create a new folder.
rmdir (RMDIR) deletes a folder, and rm (RM) deletes a file.
ps (PS) shows you a list of processes currently running.
kill (KILL) allows you to destroy one of them, by picking it's number.
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