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    <p>This Python script makes one pass through a logfile read from stdin, printing the filtered log messages to stdout.</p> <p>It uses a regular expression to match lines that mark the beginning of a log message (such as a line that starts with <code>2011-03-02 01:43:00 [</code>).</p> <p>If a line that begins a log message contains <code>[SEVERE] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms</code>, the script discards all lines between that line and the line containing the start of the next log message. Otherwise, it outputs the line. You can think of this as a finite state machine with two states, which correspond to whether the script is skipping over lines or outputting lines.</p> <pre><code>import sys import re START_OF_MESSAGE_RE = r"^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}" ERROR_RE = START_OF_MESSAGE_RE + r' \[SEVERE\] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms$' skip_until_next_message = False for line in sys.stdin: line = line.rstrip() if re.match(START_OF_MESSAGE_RE, line): if re.match(ERROR_RE, line): skip_until_next_message = True else: skip_until_next_message = False if not skip_until_next_message: print line </code></pre> <p>I added some special cases to the log file for testing. Here's the log file that I tested it with:</p> <pre><code>2011-03-02 01:43:00 [INFO] &lt;admin&gt; CraftBook is causing errors. 2011-03-02 01:43:01 [SEVERE] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms java.lang.NoSuchMethodError: com.sk89q.worldedit.blocks.BlockType.isRedstoneBlock(I)Z at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$MechanicBlockListener.onBlockRedstoneChange(MechanicListenerAdapter.java:174) at net.minecraft.server.BlockButton.a(BlockButton.java:170) at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:160) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:482) at net.minecraft.server.Packet15Place.a(SourceFile:57) at net.minecraft.server.NetworkManager.a(SourceFile:230) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:75) at net.minecraft.server.NetworkListenThread.a(SourceFile:100) [SEVERE] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:357) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:272) at net.minecraft.server.ThreadServerApplication.run(SourceFile:366) 2011-03-02 01:43:01 [INFO] &lt;admin&gt; Is it working yet? 2011-03-02 01:43:01 [INFO] &lt;admin&gt; Not really. 2011-03-02 01:43:01 [SEVERE] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms java.lang.NoSuchMethodError: com.sk89q.worldedit.blocks.BlockType.isRedstoneBlock(I)Z at com.sk89q.craftbook.bukkit.MechanicListenerAdapter$MechanicBlockListener.onBlockRedstoneChange(MechanicListenerAdapter.java:174) at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:348) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:272) at net.minecraft.server.ThreadServerApplication.run(SourceFile:366) 2011-03-02 01:43:02 [INFO] &lt;admin&gt; I hope we find a solution as soon as ever possible. 2011-03-02 01:43:01 [SEVERE] Another multi line log message 2011-03-02 01:43:01 [INFO] &lt;admin&gt; Here's the error: [SEVERE] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms </code></pre> <p>And here's the output:</p> <pre><code>$ python minecraftlog.py &lt; minecraft.log 2011-03-02 01:43:00 [INFO] &lt;admin&gt; CraftBook is causing errors. 2011-03-02 01:43:01 [INFO] &lt;admin&gt; Is it working yet? 2011-03-02 01:43:01 [INFO] &lt;admin&gt; Not really. 2011-03-02 01:43:02 [INFO] &lt;admin&gt; I hope we find a solution as soon as ever possible. 2011-03-02 01:43:01 [SEVERE] Another multi line log message 2011-03-02 01:43:01 [INFO] &lt;admin&gt; Here's the error: [SEVERE] Could not pass event REDSTONE_CHANGE to CraftBookMechanisms </code></pre>
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    1. COThank you for writing that Python script. It was surprisingly simple! In fact, it was able to process the whole file (6 GB) in only a minute. Afterwards, I just had to add the carriage returns that were removed by the Python script run on a Linux machine using a simple tr-command I found on the internet. Now I finally have got a clean log file that is 50 MB in size instead of the 6 GB it used to be including all the errors.
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