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Gnanam
Asked: 2010-04-02 01:01:58 +0800 CST

Redirecting program errors to both log and error file

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I've a Java standalone program scheduled to run as cron at every 10 minutes

I want to catch/write errors thrown by this Java program both in the log file and also as a separate error file (MyJavaStandalone.err).

I know the following commands:
Errors redirected to a separate file but not to log file

/usr/java/jdk1.6.0/bin/java MyJavaStandalone >> MyJavaStandalone.log 2>> MyJavaStandalone.err &

Both log and errors are redirected to the same log file, but errors alone are not written to a separate error file

/usr/java/jdk1.6.0/bin/java MyJavaStandalone >> MyJavaStandalone.log 2>&1 &
linux scripting bash

2 Answers

  1. Best Answer

    Give this a try:

    /usr/java/jdk1.6.0/bin/java MyJavaStandalone 2>&1 >> MyJavaStandalone.log | tee -a MyJavaStandalone.err >> MyJavaStandalone.log &
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  2. You can achieve what you want like this:

    /usr/java/jdk1.6.0/bin/java MyJavaStandalone 3>&1 2>&1 1>MyJavaStandalone.log| tee -a MyJavaStandalone.log > MyJavaStandalone.err

    What it does:

    • Create a new file descriptor 3, which will be output to STDOUT (3>&1)
    • Redirect STDERR to STDOUT (2>&1)
    • Output STDOUT to logfile (1>MyJavaStandalone.log)
    • tee takes the STDOUT of the previous command, which is actually STDERR of you Java app, appends the output to the logfile (so the logfile now has both streams) and duplicates the stream to STDOUT
    • Last, that STDOUT is simply redirected to your error log
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