01-20-2005
Quote:
Any reasons for not just always using "su -"? Just one extra key. Why would you even bother using "su"?
If you want to inherit the current shell we have to use su with out - ;
You will have subshell having all the previous environment.
When you do su - userid .., you will lose the current shell. it is equivalent to rlogin command. You will lose current shell environement.
See the following example.
$ export var1="hello"
$ echo $var1
hello
$ su user1
user1's Password:
$ echo $var1
hello
------------------> see var1 is retained to the new sub shell.
$ export var2="world"
$ su - user1
user1's Password:
$echo $var2
$
------------------> see var2 is NOT retained to the new shell.
Last edited by bhargav; 03-13-2005 at 02:22 AM..
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LEARN ABOUT OPENDARWIN
gzexe
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)