How to detect if “/dev/mapper/dev0” exists in Bash?

plumb_pete

I'm trying to make a decryption software for my NAS, so that it automatically mounts all drives and decrypts them. But, I need to know if the sudo cryptsetup luksOpen /dev/blahblahblah dev0 exists after it had attempted to open it. How do I detect that in Bash? I've attempted: if [ -e /dev/mapper/dev0 ]; then Then but that didn't seem to work. Anybody have any ideas? This is the whole code: fail="true" LUKS_PASSWORD1="" while [ $fail="true" ];...

Originally asked by Novum Gain on Stack Exchange (superuser) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

Try test -e /dev/mapper/dev0 && run_some_command It would help if you show what came after the then and as to how it failed.

Full answer by Bob Goddard: https://superuser.stackexchange.com/a/1837048 (CC BY-SA 4.0).

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