Raspberry Pi_Eng_19.3.3 Checking Each Process Information in “/proc/PID/”

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Published Book on Amazon

All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 1
All of IOT Starting with the Latest Raspberry Pi from Beginner to Advanced – Volume 2

출판된 한글판 도서

최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (상)
최신 라즈베리파이(Raspberry Pi)로 시작하는 사물인터넷(IOT)의 모든 것 – 초보에서 고급까지 (하)

Original Book Contents

19.3.3  Checking Each Process Information in "/proc/<PID>/"

 

First, if you look up the process for <Motion> program, there is PID "9223" process as below. The CMD entry for the process shows "/usr/bin/motion".

 

pi@raspberrypi ~ $ ps -C motion -f

UID        PID  PPID  C STIME TTY          TIME CMD

motion    9223     1  2 10:42 ?        00:00:01 /usr/bin/motion

 

Now, when you check "/proc/9223" to see the PID details, you can see that there is a lot of data inside.


Figure 19‑6 Information in "/proc/<PID>/" folder

 

If you look at the contents of "/proc/9223/cmdline", you can see that the command that executed the <Motion> program is stored as follows. You can see that this is the same thing you see in the "ps" command above.

 

pi@raspberrypi ~ $ cat /proc/9223/cmdline

/usr/bin/motion