onas@jonas-Visionbook-14Wr-Plus:~$ echo -e '# interfaces(5) file used by ifup(8) and ifdown(8)\nInclude files from /etc/network/interfaces.d: \nsource /etc/network/interfaces.d/*' | sudo tee /etc/network/interfaces
[sudo] jonas jelszava:       
# interfaces(5) file used by ifup(8) and ifdown(8)
Include files from /etc/network/interfaces.d: 
source /etc/network/interfaces.d/*
jonas@jonas-Visionbook-14Wr-Plus:~$ sudo ifdown wlan0 && sudo ifup -v wlan0
ifdown: /etc/network/interfaces:2: misplaced option
ifdown: couldn't read interfaces file "/etc/network/interfaces"
jonas@jonas-Visionbook-14Wr-Plus:~$