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Shell Programming and Scripting
Cron Script Question
Post 53060 by doublek321 on Saturday 3rd of July 2004 01:41:37 PM
07-03-2004
Follow up questions
Thanks for answering but as is par for the course for me, I have more questions. 
1) The thing that bugs me is that when I run the command "java MyClass" from the command line while logged in as root it runs fine. That means that "MyClass" must be in the CLASSPATH. If so, then I have to assume that the CLASSPATH is changing inside the cron script. I have no idea why though and could sure use an explanation. In fact, I guess I can't be sure that ANY environment variable is what I think it is for that matter. So, it's possible that the PATH variable is set wrong too.
Is there any way to tell what these settings are inside the script? Is the best way to figure that out to write a script that says "env > ~/myEnv" and see what the results are? Or is there a better way?
2) How do I redirect both stdout and stderr of that script to a file? Is it "java MyClass 2&1> ~/myLogfile"? Also, is there any way to put the stdout in one logfile and the stderr in another file?
1) The thing that bugs me is that when I run the command "java MyClass" from the command line while logged in as root it runs fine. That means that "MyClass" must be in the CLASSPATH. If so, then I have to assume that the CLASSPATH is changing inside the cron script. I have no idea why though and could sure use an explanation. In fact, I guess I can't be sure that ANY environment variable is what I think it is for that matter. So, it's possible that the PATH variable is set wrong too.
Is there any way to tell what these settings are inside the script? Is the best way to figure that out to write a script that says "env > ~/myEnv" and see what the results are? Or is there a better way?
2) How do I redirect both stdout and stderr of that script to a file? Is it "java MyClass 2&1> ~/myLogfile"? Also, is there any way to put the stdout in one logfile and the stderr in another file?
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LEARN ABOUT DEBIAN
airport-hostmon
AIRPORT-HOSTMON(1) General Commands Manual AIRPORT-HOSTMON(1) NAME
airport-hostmon - Host monitor for the original Apple AirPort Base Station ("Graphite"), the Lucent RG-1000 base station and the Apple Air- Port Extreme Base Station SYNOPSIS
airport-hostmon DESCRIPTION
airport-hostmon allows you to monitor the wireless hosts associated to your base station. OPTIONS
airport-hostmon accepts no command-line options. airport-hostmon is a wrapper script around the HostMonitor.jar jar file located in /usr/share/java/airport-utils. You can set the JAVACMD environment variable to use a specific JVM instead of the one chosen by the wrapper script. Set the DEBUG environ- ment variable to 1 to get the debug output from the wrapper script. ENVIRONMENT VARIABLES
DEBUG Set this variable to 1 to get the debug output from the wrapper script. JAVACMD The full path to the Java Virtual Machine to use. By default, the wrapper uses JAVACMD; if it is not set, it looks for JAVA_BINDIR/java, then for JAVA_HOME/bin/java before looking for a java executable in the PATH. In the latter case, the JVM used can be configured using the Debian alternatives system (see update-alternatives(8)). JAVA_HOME The full path where your JDK/JRE is installed. JAVA_BINDIR The full path to the directory where the java executable is located. JAVA_ARGS Extra command-line arguments to be passed to the Java Virtual Machine. AUTHOR
airport-hostmon was written by Jon Sevy <jsevy@cs.drexel.edu>. This manual page was written by Julien BLACHE <jblache@debian.org>, for the Debian project (but may be used by others). May 20, 2006 AIRPORT-HOSTMON(1)