Re: $cd /bin

["Brian Medley-3" <user=1551@nabble.blu.org>]

 On Mon, Dec 03, 2007 at 03:52:14PM -0500, Matthew Gillen wrote: 

> Brian Medley wrote: 
> > On Sun, Dec 02, 2007 at 08:07:14AM -0500, Jerry Feldman wrote: 
> > 
> > Understood, but I don't see the rational of the script to begin 
> > with.  The script is "cd" it is part of the OS, but doesn't seem 
> > like it would ever do anything.  Also, these files share the 
> > hardlinked file: 
> > 
> > $ ls -lFai cd 
> > 52922 -r-xr-xr-x   15 root  wheel  147 Aug 19  2006 cd* 
> > $ s find / -inum 52922 
> > /usr/bin/alias 
> > /usr/bin/bg 
> > /usr/bin/cd 
> > /usr/bin/command 
> > /usr/bin/fc 
> > /usr/bin/fg 
> > /usr/bin/getopts 
> > /usr/bin/hash 
> > /usr/bin/jobs 
> > /usr/bin/read 
> > /usr/bin/type 
> > /usr/bin/ulimit 
> > /usr/bin/umask 
> > /usr/bin/unalias 
> > /usr/bin/wait 
> 
> That means it's using the old unix trick of having one binary that changes 
> behavior based on how it was invoked (ie for different values of argv[0]). 
> The script part is to strip argv[0] down to something that the binary "knows" 
> (ie the /usr/bin/ part is something you don't want hard-coded into the binary).