# sysctl -hUsage: sysctl [options] [variable[=value] ...]Options: -a, --all display all variables -A alias of -a -X alias of -a --deprecated include deprecated parameters to listing -b, --binary print value without new line -e, --ignore ignore unknown variables errors -N, --names print variable names without values -n, --values print only values of a variables -p, --load[=] read values from file -f alias of -p --system read values from all system directories -r, --pattern select setting that match expression -q, --quiet do not echo variable set -w, --write enable writing a value to variable -o does nothing -x does nothing -d alias of -h -h, --help display this help and exit -V, --version output version information and exitFor more details see sysctl(8).