A CopyQ command to implement a Clipboard FIFO

FIFO.ini

[Command]
Command="
    copyq: 
    maxrow = count()-1
    select(maxrow)
    paste()
    remove(maxrow)"
GlobalShortcut=ctrl+shift+v
Name=HM Clipboard FIFO

It is not working it deletes wrong item in clipboard.

That's because of the value of the move setting (Preferences -> History -> Move item to the top). When true, the script needs a tweak. The reason is that the select function not only selects but can also move depending on that setting. You can have it like the following to work with both values:

[Command]
Command="
copyq: 
maxrow = count() - 1
select(maxrow)
paste()
if (config('move') == 'true') {
  remove(0)
} else {
  remove(maxrow)
}"
GlobalShortcut=ctrl+shift+v
Name=HM Clipboard FIFO