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UNIX for Dummies Questions & Answers
Cd
Post 7927 by rwb1959 on Wednesday 3rd of October 2001 02:12:58 PM
10-03-2001
Believe me... I do not debate the dubious value of
/usr/bin/cd. I'm only hopeing someone actually knows
why it exists. I do not believe it was a joke. The only other
possibility I can think of would be that it may act similar
to sourcing a file containing environemnt variables.
For example:
create a file called .testthis
with one line...
export HOME=/tmp
...then from your home directory do
$. .testthis
$cd
$pwd
...for the remainder of that shell session, HOME will be /tmp.
Again reasons for doing this are dubious at best but maybe
someone out there can shed some light on the reason for
having /usr/bin/cd
/usr/bin/cd. I'm only hopeing someone actually knows
why it exists. I do not believe it was a joke. The only other
possibility I can think of would be that it may act similar
to sourcing a file containing environemnt variables.
For example:
create a file called .testthis
with one line...
export HOME=/tmp
...then from your home directory do
$. .testthis
$cd
$pwd
...for the remainder of that shell session, HOME will be /tmp.
Again reasons for doing this are dubious at best but maybe
someone out there can shed some light on the reason for
having /usr/bin/cd
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LEARN ABOUT LINUX
bzexe
BZEXE(1) General Commands Manual BZEXE(1) NAME
bzexe - compress executable files in place SYNOPSIS
bzexe [ name ... ] DESCRIPTION
The bzexe 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 ``bzexe /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
bzip2(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
bzexe 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. BZEXE(1)