将 BASH 转换为 Python (v2.6)

Question

我在 bash 中有这段代码，不知道如何翻译带有“ps -C .....”和“ps -eo ....”的行，对如何编写这些行有任何帮助吗？

if [ "$SwapUsedActivity" == "true" ]
then 
    echo "WARNING: Potential Swapping happening please check for increasing swap usage"
    echo "INFO: checking kswapd number of process and cputime, check for TIME colume for how busy kswapd was"
    ps -C kswapd0 -C kswapd1 -C kswapd2 -C kswapd3 -C kswapd4  -o pid,ppid,stime,etime,time,pcpu,args
else
    echo "INFO: High swap space usage detected, not a potential issue but check activity"
fi
else
    echo "INFO: Swap usage within the limits"
fi
if [ $AvgAnnonymousMemoryused -gt 20 ]
then 
    echo "INFO: High residential memory usage detected, this may not be an issue, please check top memory consuming processes"
    echo "INFO: Printing top 10 memory consuming processes"
    ps -eo pid,ppid,user,rss,comm --sort=rss | tail -10 
fi

Answer 1

您可以使用该subprocess模块：

#!/usr/bin/env python2
import subprocess
command_1 = 'ps -eo pid,ppid,user,rss,comm --sort=rss'.split()
command_2 = 'tail -10'.split()
first = subprocess.Popen(command_1, stdout=subprocess.PIPE)
subprocess.call(command_2, stdin=first.stdout)

• command_1是管道左侧的命令，在空格上拆分以制作subprocess.Popen类所需的列表

• command_2 是管道左侧的命令拆分类似于 command_1

• first是subprocess.Popen类的对象，subprocess.Popen执行command_1并将其 STDOUT 发送到，PIPE以便我们可以将其用作输入command_2

• subprocess.call将执行command_2来自 STDOUT 的 STDINfirst

对于ps -C kswapd0 -C kswapd1 -C kswapd2 -C kswapd3 -C kswapd4 -o pid,ppid,stime,etime,time,pcpu,args命令，您可以执行以下操作：

#!/usr/bin/env python2
import subprocess
command = 'ps -C kswapd0 -C kswapd1 -C kswapd2 -C kswapd3 -C kswapd4  -o pid,ppid,stime,etime,time,pcpu,args'.split()
subprocess.call(command)

阅读关于 subprocess的官方文档以获得更多想法。