题目要求
写一个脚本计算一下linux系统所有进程占用内存大小的和。
xuehaozhe@ubuntu:~/shell$ free
total used free shared buff/cache available
Mem: 2030464 806448 154792 8484 1069224 975332
Swap: 2094076 342572 1751504
----------
xuehaozhe@ubuntu:~/shell$ ps aux |head
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.2 185164 5704 ? Ss Jun17 0:21 /lib/systemd/systemd --system --deserialize 29
root 2 0.0 0.0 0 0 ? S Jun17 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Jun17 0:01 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S< Jun17 0:00 [kworker/0:0H]
root 7 0.0 0.0 0 0 ? S Jun17 0:23 [rcu_sched]
root 8 0.0 0.0 0 0 ? S Jun17 0:00 [rcu_bh]
root 9 0.0 0.0 0 0 ? S Jun17 0:00 [migration/0]
root 10 0.0 0.0 0 0 ? S Jun17 0:00 [watchdog/0]
root 11 0.0 0.0 0 0 ? S Jun17 0:00 [watchdog/1]
xuehaozhe@ubuntu:~/shell$ ps aux |grep -v 'TIME COMMAND'|head 过滤掉第一行
xuehaozhe@ubuntu:~/shell$ ps aux |sed '1d' |head
root 1 0.0 0.2 185164 5704 ? Ss Jun17 0:21 /lib/systemd/systemd --system --deserialize 29
root 2 0.0 0.0 0 0 ? S Jun17 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Jun17 0:01 [ksoftirqd/0]
root 5 0.0 0.0 0 0 ? S< Jun17 0:00 [kworker/0:0H]
root 7 0.0 0.0 0 0 ? S Jun17 0:23 [rcu_sched]
root 8 0.0 0.0 0 0 ? S Jun17 0:00 [rcu_bh]
root 9 0.0 0.0 0 0 ? S Jun17 0:00 [migration/0]
root 10 0.0 0.0 0 0 ? S Jun17 0:00 [watchdog/0]
root 11 0.0 0.0 0 0 ? S Jun17 0:00 [watchdog/1]
root 12 0.0 0.0 0 0 ? S Jun17 0:00 [migration/1]
#!/bin/bash
sum=0
for n in `ps aux |grep -v 'TIME COMMAND'|awk '{print $6}'`
do
sum=$[$sum+$n]
done
echo $sum
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