How to write this script?

[Paul Howarth]

Hongwei Li wrote:
> I have a basic question about a script.  In this script, I want to mount a
> network drive, if successful, then do somethings, otherwise, exit.  My
> script is like this:
> 
> #!/bin/csh
> if ( `mount sever2:/opt /mnt` ) then
>  ....
>  umount /mnt
> endif
> 
> When I run this script, it does mount the network drive (server2 has done
> all nfs, exportfs etc.), but did not do anything inside the if-endif, and
> did not umount it.  How should I write this script?

In your script, the `mount sever2:/opt /mnt` runs the command and any 
output generated by the command is substituted into where the quote 
marks were. So, if as normal, no output is produced, you end up with:

if ( ) then
   ...
endif

which doesn't make much sense. You don't need the backquotes.

I'd steer clear of scripting in csh if I was you 
(http://www.faqs.org/faqs/unix-faq/shell/csh-whynot/). In sh you could 
do it like this:

#!/bin/sh
if mount sever2:/opt /mnt; then
   ...
   umount /mnt
fi

Paul.