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Full Discussion: su (-) command
Top Forums UNIX for Advanced & Expert Users su (-) command Post 27756 by RTM on Friday 6th of September 2002 09:37:51 AM
Old 09-06-2002
I can't phantom why you would want to do this.

You could set up a script or executable to replace the su command so that it gets executed instead, looks for the $1 option and if it's a - , removes it before sending the information to the real su

# mv /bin/su /bin/oldsu
# cp /mynewsu /bin/su
# su - joeuser

Your script would have to be able to receive the two parameters.
Logic would remove the -, and then run /bin/oldsu with the parameter joeuser (if there was no userid, then root).

Of course, a person that can list /bin could see the /bin/oldsu and run it directly. There would be no real way to get rid of that problem.

Your best bet would be to get sudo or some other program. Also any upgrades or patches added to the server may replace your su program.

But this could possibly be done. I have never done it but it's one idea. I wouldn't recommend it even though I put it out here.
 

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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe [ name ... ] DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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