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I attached GSM Modem on Kubuntu Linux via USB. How will I know the exact path to the device ? It gets detected by the system and when I run lsusb I see the following:

rvb@rvb:/dev$ lsusb
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 007: ID 12d1:1446 Huawei Technologies Co., Ltd. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 04f2:b070 Chicony Electronics Co., Ltd 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The device I plugged in is listed as Huawei Technologies Co., Ltd. Will I know if my device is on /dev/ just by looking at the output above?

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Communications devices are never mounted. – Ignacio Vazquez-Abrams Jul 24 '11 at 7:04
    
right.sorry for the not knowing the term – r2b2 Jul 24 '11 at 8:06

Try running lshw, and see if you see anything about a modem or a serial device. Try running dmesg a couple times directly after connecting the device. If the USB devices is recognized you may see notices about it setting up something under /dev/ttyS*

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thanks. im gonna try this once i get home. – r2b2 Jul 25 '11 at 3:49

For a USB stick you can do:

ls -l /sys/dev/block

This will give you a list of all block devices that the kernel and udev recognize even before the device is mounted. The output will include something like:

../../devices/pci0000:00/0000:00:1d.7/usb1......./block/sda/sda1

So the new device is /dev/sda1.

Your USB modem is probably a character device so try:

ls -l /sys/dev/char

Look for a new entry after it is turned on. For a USB printer I get:

../../devices/pci0000:00/0000:00:1d.7/usb1/1-1/1-1:1.0/usb/lp0

So the new device is /dev/lp0 and is a character device.

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thanks. im gonna try this once i get home. – r2b2 Jul 25 '11 at 3:49

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