ls -axi (what does it do)? So I was messing around in terminal, and when i opened it, I typed cd applications .

Nothing bad here.

Then, I typed ls -a\ in applications (or maybe /, I don't know, but it opened the &gt; thing after for a multi line command.

Not remembering how to exit, I tried to type exit but instead typed xi and hit enter on my MAcBook Air. It said that it was doing something, but i tried to quit the terminal seeing it was deleting/restoring something (pls don't question my logic here). 

Have no idea what it did, but when i go up in terminal, it says i typed ls -axi

What did this do?
ls -axi would have performed a regular directory listing, but with more contents (-a showing dot-files), a horizontal sort (-x) in columns, and with the inode number present (-i).

From the man page for ls:


-a


  Include directory entries whose names begin with a dot (.).


~ $ ls
Desktop     Downloads  Movies  Pictures
Documents   Library    Music   Public

~ $ ls -a
.          Downloads  Pictures
..         Library    Public
Desktop    Movies
Documents  Music

-x


  The same as -C, except that the multi-column output is produced with entries sorted across, rather than down, the columns.



-C


  Force multi-column output; this is the default when output is to a terminal.





~ $ ls -ax
.          ..         Desktop
Documents  Downloads  Library
Movies     Music      Pictures
Public

-i


  For each file, print the file's file serial number (inode number).


~ $ ls -axi
686312 .          643912 ..         686338 Desktop
686325 Documents  686327 Downloads  686313 Library
686390 Movies     686333 Music      686336 Pictures
686386 Public