# cat /proc/sys/kernel/pid_max32768# sysctl -a|grep pid_maxkernel.pid_max = 32768

# 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).