AmigaDOS question

[brolly]

I've been going back and forth with this one and can't figure it, is there any way that I can check in a script if a specific drive is available?

I was hoping IF EXISTS would work, but if the drive doesn't exist it shows an error message dialog saying so and I want it to be silent.
Example:
IF EXISTS dh1:testfile -> If testfile doesn't exist no message dialog shows up, but if there is no dh1 drive then a dialog will popup with an error stating the drive doesn't exist.
Same thing if I simply try IF EXISTS dh1:

Is there any way to make this work, or maybe some other AmigaDOS command I might be missing?

[thomas]

Assign >NIL: EXISTS DH1:
IF NOT WARN
  Echo "DH1 is available"
EndIF

[brolly]

Nice one, thanks.
That worked perfectly, but I ran into an issue when using it with floppies though.

This works fine:
Assign >NIL: EXISTS DF0:
But EXISTS will always return true no matter if I have a floppy inserted on df0 or not which is correct since df0 does exist, so this code won't work as I wanted:

Assign >NIL: EXISTS DF0:
IF NOT WARN
IF EXISTS DF0:S/My-Script
Echo "Run the script"
EndIF
EndIF

Once it hits the IF EXISTS DF0:S/My-Script line a dialog will appear saying there is no disk on drive df0.
I was hoping using this instead would work:
Assign >NIL: EXISTS DF0:S

But assign always fails with returncode 20 this way. So what's the best way to check if I have a floppy present on df0? I will always have the df0 drive present so on this case I need to check if a disk is present there or not.

[Arnie]

IF EXISTS DF0:S/My-Script
Echo "Run the script"
ELSE
Echo "Dont run the script"
EndIF

[brolly]

That's exactly what I have on my post above, like I said that doesn't work. If there is no disk on df0 a dialog will popup saying so and that's what I'm trying to avoid.

[Arnie]

You may need a third party program. I use "Isinserted" to check if a CF card is present in CF0:.

Try a search on Aminet for a suitable program.

EDIT:

Isinserted DF0:
IF not warn
if exists df0:s/myscript
echo "Use myscript"
else
echo "dont use"
endif
endif

[thomas]

It's probably better to use a program which was made for this purpose.

However, this could work, too:

info >t:tempfile DF0:
search >nil: t:tempfile "No disk present"
if not warn
  echo "no disk present in drive DF0"
else
  echo "either there is a disk in drive DF0 or drive DF0 does not exist"
endif

[brolly]

Thanks guys, Isinserted did the trick had no idea such a program existed.
Unfortunately it doesn't work on WB1.3 so I can't use it on all situations. For those I ended up using your clever workaround thomas and it worked like a charm

[thomas]

Here is one which works on 1.3, too:

[brolly]

Thanks again thomas, just tested that one and it works great.