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I started a program written using Node.js and started it using launch pipe into logfile and send it to background.

Half way running the program exited w/o any error both on the console nor the log, I even checked the /var/log/message and no way I could figure out what's wrong with the program.

Are there any better way to able to capture the error/messages that causes the exit?

The current execution bash script is following:

./run_all_with_logs >> logs/my.log &
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2 Answers

up vote 3 down vote accepted

Let's enhance P.T.:s answer just a little.

The basic form sends all normal output to the log file.

./run_all_with_logs >> logs/my.log &

If we redirect the errors we can log both the errors and the normal printouts.

./run_all_with_logs 2>&1 >> logs/my.log &

If we then executes the command in a subshell we can print the exit code as well.

(./run_all_with_logs ; echo "Final Exit Code: $?" ) 2>&1  >> logs/my.log &
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Yeah, including stderr is a very important addition. – P.T. Sep 26 '11 at 17:11
Thanks Johan, you made the best suggestion. – d4v1dv00 Sep 27 '11 at 2:34
up vote 5 down vote

The exit code should tell you if the process was killed by an external signal or exited with a (hopefully useful) internal exit code on its own.

You can expand your command-line a bit to include the exit code (see other questions for decoding this exit code):

(./run_all_with_logs ; echo "Final Exit Code: $?" ) >> logs/my.log &

You could make this a bit fancier (decoding exit status, etc).

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Add the magical 2>&1 so you log the errors as well, and your answer will be even better. – Johan Sep 26 '11 at 14:12
@Johan: better keep the changes minimal with respect to the OP's command line or you would confuse everyone. – Stéphane Gimenez Sep 26 '11 at 14:30

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