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30

Can one pick up a running application from terminal?

rated 0 times [ 30] [ 0] / answers: 1 / hits: 16965 / 2 Years ago, wed, january 26, 2022, 8:47:01

Sometime I need to run an application from terminal for debugging. If I am sure the bug will occur short after launching the application, I can run this application from the Terminal.

However, bugs occur unexpectedly, and then only I need to monitor the buggy application from the Terminal (to see its output).

Can I then pick up an application from terminal, which was not launched using Terminal? If so how?

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brasiplacar

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answered 2 Years ago fotres · Accepted Answer

Each process in linux has a special directory /proc/{pid}/fd/. 0 is stdin, 1 is stdout and 2 is stderr. So, assuming you are only interested in diagnostic output you can determine the process pid, and then in the terminal do:

to see stdout:

cat /proc/{pid of process}/fd/1

to see stderr:

cat /proc/{pid of process}/fd/2