HVTA [cnttbachkhoa]

I'll give this a shot.  I have yet to encounter a file in UNIX ending  with '*'.  Usually * is a wildcard that can represent 1 or more  characters in a regular expression.

e.g  cp /* /home/*

would copy all files in that directory to the /home directory.  An easy  way to tell if a file is executable is to give the 'ls -l' command for a  long listing.  You may want to issue 'ls -l | more' if it's a large  directory.  Or alternatively 'ls -l | grep "filename".

In the first column you'll see something like this

-rwxr-xr-x  the 'x' is what determines who can execute the file.  The  first 3 spaces belong to 'owner' the 2nd 3 spaces belong to the 'group'  and the third 3 spaces belong to 'others'

the rwx represents the permissions for owner (rwx), group (r-x) and  others (r-x).  If you have permissions you can use the 'chmod' comand to  make the file executable, but the extension won't change.  (In UNIX any  file can be made executable)

Issue './"filename"' to execute the file.