How to pipe Java exceptions into a text file along with normal output

command lineconsolejavaloggingpipe

When I use batchfile.bat >> logfile.txt command in the Windows commandline, it correctly outputs the normal output into the text file, but the Java exceptions get output to the console. Can I make it so that exceptions are written to log file as well?

Best Answer

Java exceptions are printed on the standard error stream.

To pipe the standard error stream (file descriptor 2) into a file you can do:

batchfile.bat 2>> errorlog.txt

To pipe both standard error and standard out into the same file:

batchfile.bat >> logfile.txt 2>&1

You can do the same on Unix and Windows

Related Solutions

Windows Command Line – Redirect Output to Text File While Also Seeing Output

The windows PowerShell has a tool that can do that, named tee after the unix tool which does the same.

Alternatively, there are ports of the unix tee for windows:

GNU utilities for Win32 (last update 2003)
CoreUtils for Windows (last update 2005)

Windows – How to capture shell output to text file

The same way as in Linux:

echo "Hello" >text.output

Errors usually printed to stderr stream (it is #2). You can capture stderr stream:

del 1.txt 2>text.output

If the file 1.txt does not exist, text.output will contain Could not find 1.txt.

You can redirect stdout to stderr:

echo "Hello" 2>&1

Or stderr to stdout:

echo "Hello" 1>&2

P.S. I'm not sure your command would work in Linux. Anyway echo "hello" >& text.output generates a syntax error: >& was unexpected at this time.

Best Answer

Related Solutions

Windows Command Line – Redirect Output to Text File While Also Seeing Output

Windows – How to capture shell output to text file

Related Question