Automount: The Nickel Tour

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Is it not possible to have a filemanager popup with the content of the USB device - if it is a hard drive or memory stick ??

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Yes, that can be done, but that's a different article altogether. I wrote a summary of how to do this with just udev here:
http://www.skepticats.com/linlog/content/udevautorun/

If you use GNOME, I understand you can do this with the GNOME volume manager. If you distribution comes with HAL and D-BUS, you can also use IVMan for this.

udev in recent kernels

hi
with recent kernels hotplug is vanished replaced by udev; i am not able to find /etc/dev.d, anymore; i have to use an autorun when an usb pen is automounted like http://linlog.skepticats.com/content/udevautorun/ explain.
But, at the moment, i am not able to find a place where put bash script to be executed.
Any advice would unvaluable

Use udev rules

These days, you can do the same sort of thing with udev rules. You would create/edit a file in your /etc/udev/rules.d directory that specifies the device and the script you want to run.

You can see an example rule in this entry:
http://linlog.skepticats.com/entries/2007/11/Fixing_Sansa_attributes.php
In that case, the rule has 4 parts:
1) The kernel device - here a USB mass storage node like sda0.
2) The action - "add" for inserting the device.
3) Some attributes - in this case the model string, to distinguish it from other USB devices.
4) The RUN action, which just executes a program, in this case passing it the kernel device name as a parameter.

Hopefully that should get you started. The only hard part if figuring out the exact attributes you need to identify a particular device.