how can I override alias set in .bash_aliases
Add a \ (backslash) before the command to disable the alias, like this:
\ls
This will invoke the original (un-aliased) ls.
Example:
$ ls #will invoke the aliastotal 0-rw-rw-r-- 1 dogbane foo 0 Nov 3 16:04 c-rw-rw-r-- 1 dogbane foo 0 Nov 3 16:04 b-rw-rw-r-- 1 dogbane foo 0 Nov 3 16:04 a$ \ls #will disable the aliasa b c