how to protect file using password

[Matthew Flaschen]

Karl F. Larsen wrote:
> Every file has a owner. Every owner has a password. You check for the
> owner with ls -al and it will give you something like this:
> 
> karl at karl-hardy:~$ ls -al test -rw-r--r-- 1 karl karl 528 2008-08-11
> 16:40 test
> 
> The -rw means read and write. The karl means user karl is the owner.

I'm fairly certain the OP doesn't mean Unix permissions (which can be
bypassed in a myriad of ways), Karl.

Encryption methods worth looking at include cryptsetup-luks, gpg, and
True Crypt.

Matt Flaschen