How to autodetect device name in Linux

Question

I have an encrypted USB dongue with cryptosetup, to mount it I have to execute a script that has hardcoded (or admits it as a parameter) the device name of that dongue that previously you had to search.

I wonder is there is any way via bash scripting or even doing a miniprogram to make an autodetection of the device name, leaving the workflow something like this:

• Connect USB dongue
• Execute script
• Script searches for the device name of the dongue and mounts the device
• Cryptosetup asks for the password
• Device is mounted

Answer 1

The device name should appear in dmesg. Try something like this:

dev_name="/dev/"`dmesg | perl -ne '/.+\[(.+?)\] Attached/ && do{print "$1\n"}' | tail -n 1`

Assuming that your USB dongle is the last device attached (hence the tail -n1), this should save the device name as $dev_name.