usb device name as variable in a shell script

[leonida]

Sorry, I'm not very experienced with script.
Do you know how can I get usb device name as variable in a shell script (.command) that has to be run from device itself?

Ex:

cp /Volumes/<mydevice>/alpha /Volumes/<mydevice>/beta

where <mydevice> can change.

Thanks in advance, L.

[hayne]

Quote: Originally Posted by leonida Sorry, I'm not very experienced with script. Do you know how can I get usb device name as variable in a shell script (.command) that has to be run from device itself? Ex: cp /Volumes/<mydevice>/alpha /Volumes/<mydevice>/beta where <mydevice> can change.

You aren't being very clear about what you want.
Or perhaps you just want to know how to create and use variables in a shell script. You would do it like this:

mydevice="the_name_of_the_device"
cp "/Volumes/$mydevice/alpha" "/Volumes/$mydevice/beta"

I assume from your example, that the "USB device" you are concerned with is actually a mounted disk drive. In that case, it's not really relevant that it is a USB device - what is relevant is that it is mounted under /Volumes.

Perhaps this Unix FAQ might be of help.

[leonida]

I'm trying something like this
Allow .command files to determine working directory.
In your example I don't know the: "the_name_of_the_device"
I wish to get "the_name_of_the_device" as variable as I don't know it or as it could be changed.

At the moment with:

#!/bin/sh
here="`dirname \"$0\"`"
echo "cd-ing to $here"

I get this error

here="(dirname: bad interpreter: No such file or directoryin/sh

[hayne]

Quote: Originally Posted by leonida I get this error here="(dirname: bad interpreter: No such file or directoryin/sh

I suspect that your script file is using something other than Unix end-of-line characters.
What editor are you using to create this script file?
See this Unix FAQ about the end-of-line character issue and recommendations for editors.

[leonida]

Quote: Originally Posted by hayne What editor are you using to create this script file?

I'm using Smultron

[hayne]

Quote: Originally Posted by leonida I'm using Smultron

Check the "line endings" preference in Smultron. I recommend setting it to force Unix line-endings.
There should also be a way to see what the line-endings are for a particular document.

Otherwise, try using the Perl script I supply in the line-endings section of that FAQ to fix the line-endings of your script file.

[leonida]

Thanks, that was the problem, now I'm using nano.

Is there a way to get device name instead of dirname?

[hayne]

Quote: Originally Posted by leonida Is there a way to get device name instead of dirname?

You'll have to explain using more words to describe what you are trying to do.
Or maybe you are asking: "How do I find out the "/dev" entry that corresponds to a particular disk?" - if so, look at the output of the 'df' command.

[leonida]

Quote: Originally Posted by hayne You'll have to explain using more words to describe what you are trying to do. Or maybe you are asking: "How do I find out the "/dev" entry that corresponds to a particular disk?" - if so, look at the output of the 'df' command.

Sorry I'm quite a newbie, and I'm not english speaking, and thanks a lot for your help.
I've solved my problem but I like to learn more.
I'm interested on how do I find out the "Volumes/<name_of_volume>" and use it as a variable.
Es:

here="<something that tell me the Volumes name>"
echo "My Volume name is $here"