Enable "cli" mode equivalent in JunOS
cli
Configure Mode
configure
So rather than going to the console on a Cisco switch and typing "enable" and then "conf t", the equivalent in JunOS is "cli" and "configure".
How Do You Apply Changes You've Made?
You can make all kinds of changes to the switch, but remember they are not........
Set this in /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
#apply the settings
sudo sysctl -p
Quick Temp Fix (expires upon reboot):
If you just want ipv6 gone from a specific interface change "all" below to say eth0 or whatever interface.
echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6........