* [email protected] <[email protected]> [26-01/24=Sat 21:12 -0700]:
> # blkid --uuid 2026-01-19-03-28-45-00
> /dev/sdc
> Meaning that the block device with that UUID is connected to the system.
>
> When this executes,
>
> destination="2026-01-19-03-28-45-00";
> printf "destination=$destination\n";
> if ! ( lsblk -alno UUID | grep $destination > /dev/null ); then
> printf "destination device not connected. Aborting.\n"
> else
> printf "destination device is connected.\n"
> dev="$( blkid --uuid $destination )";
> printf "dev=$dev\n";
> # FTH;
> fi;
>
> this is the output.
> destination=2026-01-19-03-28-45-00
> destination device not connected. Aborting.
>
> With the device being present, I expect this.
> destination=2026-01-19-03-28-45-00
> destination device is connected.
> dev=/dev/sdc
>
> Does this line have a syntax error?
> if ! ( lsblk -alno UUID | grep $destination > /dev/null ); then
The syntax is correct but the logic is confusing. Try this:
$ PS1='$?\$ '
0$ blkid --uuid 473f5ac6-f392-488c-b51f-1798531db64a
/dev/vda2
0$ blkid --uuid 473f5ac6-f392-488c-b51f-1798531db64aXXXX
2$ isConnectedUUID(){ lsblk -alno UUID|grep "$1" >/dev/null;}
0$ isConnectedUUID 473f5ac6-f392-488c-b51f-1798531db64a
0$ isConnectedUUID 473f5ac6-f392-488c-b51f-1798531db64aXXXX
1$ if isConnectedUUID 473f5ac6-f392-488c-b51f-1798531db64a;then echo OK;else
echo OOPS;fi
OK
0$
