It's because you're using the fish shell instead of the more common bash shell. If I understand correctly, the fish translation of Vej's command is:
env DEJA_DUP_DEBUG=1 deja-dup --backup | tail -n 1000 > /tmp/deja-dup.log
or:
set -x DEJA_DUP_DEBUG 1 deja-dup --backup | tail -n 1000 > /tmp/deja-dup.log
It's because you're using the fish shell instead of the more common bash shell. If I understand correctly, the fish translation of Vej's command is:
env DEJA_DUP_DEBUG=1 deja-dup --backup | tail -n 1000 > /tmp/deja-dup.log
or:
set -x DEJA_DUP_DEBUG 1
deja-dup --backup | tail -n 1000 > /tmp/deja-dup.log