Re: what is the difference?

From: scriptOmatic (ScriptOmatic_at_ChironComputing.Com)
Date: 04/29/03 

Date: Tue, 29 Apr 2003 00:13:15 GMT

Shawn wrote:
>
> Hi,
>
> Could somebody tell me what the difference between these 2 scripts are?
>
> if $status then
> echo "File transfer from cs-vulcan failed"
> exit 1
> endif
>
> ##########
>
> if ($status != 0) then
> echo "File transfer from cs-vulcan failed"
> exit 1
> endif
>
> Thanks!

I assume you are in /bin/csh or /bin/tcsh because these shells
define $status to the the value of the last command executed.

With UNIX, if the last command exited 0 then, of course,
$status == 0 is TRUE.

With UNIX if a command exits with 0 that means SUCCESS and any
value not zero means failure. While this is not strictly true,
because any programmer can intentially break the rule,
it is non-theless true for utilities. Note however, if you
are using an FTP client, many of them do not play by the rules.

YOu can see the NCFTP client and/or you might look at OSM which
includes a file transfer plugin to do what you want above.

Back to the scripts ....

if $status then
...

would mean

if 0 then
   echo failure
and that should be WRONG

but the second script
if ($status != 0) then
 echo failure

is correct (again assuming the copy command plays by the rules).

You might also try, for remote copies, rcp and/or scp.

FYI the OSM implementation allows you to use anonymous and/or passworded
transfers. 

-- 
http://ftp.opensysmon.com is a shell script archive site with an
open source system monitoring and network monitoring software package.
Many platforms are supplied already compiled.

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