指定秒数経過したプロセスを kill

ps_kill.sh

#!/bin/bash

epoch=$(sed -n 's/^btime //p' /proc/stat)
clk_tck=$(getconf CLK_TCK)
now=$(date +%s)
seconds=300

for pid in $(ps aux | grep jav[a] | awk '{print $2}'); do
    start_time=$(awk '{print $22}' /proc/${pid}/stat)
    ps_uptime=$(($now - ( $epoch + ($start_time / $clk_tck) ) ))

    if [ ${ps_uptime} -ge ${seconds} ]; then
        kill -TERM ${pid}
    fi
done