System Control
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sysctl
Reads/sets kernel settings from the virtual /proc file system.
Values can be edited directly with echo 1/0 >> /proc/net/ipv6/conf/all/disable_ipv6 (fleeting) or by editing /etc/sysctl.conf or /etc/sysctl.d/parameter (persistent).
Settings
sysctl -a list all settings
sysctl -a | grep net.ipv6.conf.all.disable_ipv6 list specific setting
sysctl net.ipv6.conf.all.disable_ipv6 list specific setting
sysctl -w parameter=value change $parameter to $value (fleeting)
sysctl -p reload settings