How to check if a volume/drive exists?

[Foebane]

Is there a command to check if a drive/volume exists before using the CD command to change to it and run a script? This is because my User-Startup uses this command at the moment to change to DH4:, but not all my configurations have a DH4: and this command is being called from a WB HDF.

I thought "IF EXISTS DH4:" would work fine, but apparently not.

EDIT: Reply if you like, but I think I've found a workaround if there's no solution to this issue. However, if there is a solution, then I'll happily accept it.

[kolla]

Isn't there an "assign dh4: exists"?

[-Acid-]

Assign >NIL: exists dh4:
if not warn
do something
else
dont bother
endif

[Foebane]

Originally Posted by -Acid-

Assign >NIL: exists dh4:
if not warn
do something
else
dont bother
endif

This script didn't work for me, even with "dh4:@", with @ being the name of the file to execute.

I've found a simple solution, and it works. Thanks, anyway.

[desiv]

Originally Posted by Foebane

I've found a simple solution, and it works. Thanks, anyway.

And??
Enquiring minds want to know!!!! ;-)

Thanx

[Foebane]

Originally Posted by desiv

And??
Enquiring minds want to know!!!! ;-)

Thanx

My solution was to simply add DH4: to the configuration and point to an empty "@" file, so there wouldn't be any more "Drive DH4: is empty" messages and yet it wouldn't run anything else.

Now the User-Startup lines involved are simply:

CD DH4:
EXECUTE @

When I tried the script suggested by Acid, the DH4: wasn't executed either way, and to be honest, I'm still rusty on some AmigaDOS commands. At least I know what the two above lines do.

[StingRay]

Originally Posted by Foebane

This script didn't work for me, even with "dh4:@", with @ being the name of the file to execute.

I've found a simple solution, and it works. Thanks, anyway.

Acid's solution works fine so you most probably did it wrong. Easy check:

assign >NIL: DH4: exists
if not warn
echo "DH4: found"
else
echo "DH4: not available"
endif

Copy/paste and execute it and you'll either see a "not available" or "found" text.

[malko]

If you are using ARP, you can use the following :

IF EXISTS DH4:
   <put your code here>
ELSE
   <put your code here>
ENDIF

PS:

Originally Posted by Foebane

[...] EDIT: Reply if you like, but I think I've found a workaround if there's no solution to this issue. However, if there is a solution, then I'll happily accept it.

Nice one !

[Foebane]

Cool, it worked this time! Don't know what I did wrong before.

Thanks, StingRay, Acid and Malko!

I guess I gave up too easily.

[mech]

I know this is a old thread,but there is something on Aminet that may apply:


aminet.net/disk/misc/chkcd10.lha