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I placed an entry in my fstab file to add a swap partition.

I used output of a bash command to get the UUID of vdb1 partition(I can't copy paste).

Like this:

UUID=$(blkid -o value -s UUID /dev/vdb1)  swap   swap  defaults 0 0 

I'm getting a parse error when I run 'mount -a'.

How can I do this correctly?

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    fstab is not a shell script. Why don't you just use /dev/vdb1 as the first field (or add the actual UUID of the device directly)?
    – Kusalananda
    Jun 21 '19 at 21:20
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As Kusalananda comments, fstab cannot interpret embedded shell commands, resulting in your fstab causing this error.

With regards to your comment about cut/paste - I understand that typing in a uuid is daunting and likely error prone, but you could simply append the uuid to the end of your fstab by executing:

blkid -o value -s UUID >> /etc/fstab

... And then editing /etc/fstab in order to edit the 'junk' uuid line into a valid syntax.

I suggest this only as a way of compensating for the lack of a mouse/copy/paste facility.

If you don't fully understand what I am proposing here then do not do this! It will make your fstab syntax invalid, and prevent your system from booting until corrected.

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    never thought of appending, thanks. Jun 21 '19 at 22:10

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