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Full Discussion: How to grep logs for errors and receive specific additional lines?
Top Forums Shell Programming and Scripting How to grep logs for errors and receive specific additional lines? Post 302855755 by nbsparks on Friday 20th of September 2013 05:41:49 PM
Old 09-20-2013
How to grep logs for errors and receive specific additional lines?
Hi there,

I have a script that I've used to find errors in my Minecraft Server logs. But I'd like to refine that script to be more useful.

Here is the script:
Code:
grep -n "SEVERE" /minecraft/server.log | awk -F":" '{print $1-2 "," $1+10 "p"}' | xargs -t -i sed -n {} /minecraft/server.log  >> /minecraft/severe_errors.log

Here is what the script is looking through:
Code:
2013-09-20 09:55:28 [INFO] [PermissionsEx] Enabling PermissionsEx v1.19.5
2013-09-20 09:55:28 [INFO] [PermissionsEx] Superperms support enabled.
2013-09-20 09:55:28 [INFO] [PermissionsEx] v1.19.5 enabled
2013-09-20 09:55:28 [INFO] WEPIF: PermissionsEx detected! Using PermissionsEx for permissions.
2013-09-20 09:55:28 [INFO] [Vault][Chat] PermissionsEx_Chat hooked.
2013-09-20 09:55:28 [INFO] [Wither] Enabling Wither v2.0
2013-09-20 09:55:28 [INFO] [Wither] Wither v2.0 enabled!
2013-09-20 09:55:28 [INFO] [MobCatcher] Enabling MobCatcher v3.7
2013-09-20 09:55:28 [INFO] [MobCatcher] Author: Malikk
2013-09-20 09:55:28 [INFO] You are not running the correct version of Craftbukkit for this version of MobCatcher.
2013-09-20 09:55:28 [INFO] MobCatcher v3.7 is intended to be run on CB 1.5.1-R0.1-SNAPSHOT
2013-09-20 09:55:28 [INFO] Expect major bugs or failure to enable. Please do not report bugs until you are using compatible versions of CB and MobCatcher.
2013-09-20 09:55:28 [INFO] [MobCatcher] Hooked Vault 1.2.24-b304
2013-09-20 09:55:28 [INFO] [MobCatcher] Spout was not found.
2013-09-20 09:55:28 [INFO] [MobCatcher] remove stackability: true
2013-09-20 09:55:28 [SEVERE] Error occurred while enabling MobCatcher v3.7 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R2/Item
    at me.jordan.mobcatcher.MobCatcher.removeStackability(MobCatcher.java:1170)
    at me.jordan.mobcatcher.MobCatcher.onEnable(MobCatcher.java:120)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
    at org.bukkit.craftbukkit.v1_5_R3.CraftServer.loadPlugin(CraftServer.java:282)
    at org.bukkit.craftbukkit.v1_5_R3.CraftServer.enablePlugins(CraftServer.java:264)
    at net.minecraft.server.v1_5_R3.MinecraftServer.j(MinecraftServer.java:304)
    at net.minecraft.server.v1_5_R3.MinecraftServer.e(MinecraftServer.java:283)
    at net.minecraft.server.v1_5_R3.MinecraftServer.a(MinecraftServer.java:243)
    at net.minecraft.server.v1_5_R3.DedicatedServer.init(DedicatedServer.java:151)
    at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:382)
    at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_R2.Item
    at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 13 more
2013-09-20 09:55:28 [INFO] [Multiverse-Inventories] Enabling Multiverse-Inventories v2.5-b346
2013-09-20 09:55:28 [INFO] [Multiverse-Inventories 2.5-b346] enabled.
2013-09-20 09:55:28 [INFO] [WormholeXTreme] Enabling WormholeXTreme v1.031
2013-09-20 09:55:28 [INFO] [WormholeXTreme][v1.031] Boot sequence initiated...
2013-09-20 09:55:28 [INFO] [WormholeXTreme][v1.031] Wormhole Worlds support disabled in settings.txt, loading stargates and worlds by our self.
2013-09-20 09:55:29 [INFO] [WormholeXTreme] 49 Wormholes loaded from WormholeDB.
2013-09-20 09:55:29 [INFO] [WormholeXTreme] PermissionAlias backend: 'pex' registered!
2013-09-20 09:55:29 [INFO] [WormholeXTreme] PermissionAlias backend: 'bukkit' registered!
2013-09-20 09:55:29 [INFO] [WormholeXTreme] Attempting to use supported permissions plugin 'PermissionsEx'
2013-09-20 09:55:29 [WARNING] [WormholeXTreme] This plugin is not ready yet.
2013-09-20 09:55:29 [INFO] [WormholeXTreme] Initializing bukkit backend
2013-09-20 09:55:29 [INFO] [WormholeXTreme] Config node PERMISSIONS_BACKEND changed to 'pex'
2013-09-20 09:55:29 [INFO] [WormholeXTreme] Initializing pex backend
2013-09-20 09:55:29 [WARNING] [WormholeXTreme] This plugin is not ready yet.
2013-09-20 09:55:29 [INFO] [WormholeXTreme] Attached to PermissionsEx version 1.19.5
2013-09-20 09:55:29 [INFO] [WormholeXTreme][v1.031] Boot sequence completed
2013-09-20 09:55:29 [INFO] [Multiverse-NetherPortals] Enabling Multiverse-NetherPortals v2.5-b660
2013-09-20 09:55:29 [INFO] [Multiverse-NetherPortals] - Version 2.5-b660 Enabled - By Rigby and fernferret
2013-09-20 09:55:29 [INFO] Server permissions file permissions.yml is empty, ignoring it
2013-09-20 09:55:29 [INFO] Done (4.261s)! For help, type "help" or "?"

Here is what the script grabs:
Code:
2013-09-20 09:55:28 [SEVERE] Error occurred while enabling MobCatcher v3.7 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R2/Item
        at me.jordan.mobcatcher.MobCatcher.removeStackability(MobCatcher.java:1170)
        at me.jordan.mobcatcher.MobCatcher.onEnable(MobCatcher.java:120)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.loadPlugin(CraftServer.java:282)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.enablePlugins(CraftServer.java:264)
        at net.minecraft.server.v1_5_R3.MinecraftServer.j(MinecraftServer.java:304)
        at net.minecraft.server.v1_5_R3.MinecraftServer.e(MinecraftServer.java:283)

Here is what I wish the script grabbed instead:
Code:
2013-09-20 09:55:28 [INFO] [MobCatcher] Enabling MobCatcher v3.7
2013-09-20 09:55:28 [INFO] [MobCatcher] Author: Malikk
2013-09-20 09:55:28 [INFO] You are not running the correct version of Craftbukkit for this version of MobCatcher.
2013-09-20 09:55:28 [INFO] MobCatcher v3.7 is intended to be run on CB 1.5.1-R0.1-SNAPSHOT
2013-09-20 09:55:28 [INFO] Expect major bugs or failure to enable. Please do not report bugs until you are using compatible versions of CB and MobCatcher.
2013-09-20 09:55:28 [INFO] [MobCatcher] Hooked Vault 1.2.24-b304
2013-09-20 09:55:28 [INFO] [MobCatcher] Spout was not found.
2013-09-20 09:55:28 [INFO] [MobCatcher] remove stackability: true
2013-09-20 09:55:28 [SEVERE] Error occurred while enabling MobCatcher v3.7 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R2/Item
    at me.jordan.mobcatcher.MobCatcher.removeStackability(MobCatcher.java:1170)
    at me.jordan.mobcatcher.MobCatcher.onEnable(MobCatcher.java:120)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
    at org.bukkit.craftbukkit.v1_5_R3.CraftServer.loadPlugin(CraftServer.java:282)
    at org.bukkit.craftbukkit.v1_5_R3.CraftServer.enablePlugins(CraftServer.java:264)
    at net.minecraft.server.v1_5_R3.MinecraftServer.j(MinecraftServer.java:304)
    at net.minecraft.server.v1_5_R3.MinecraftServer.e(MinecraftServer.java:283)
    at net.minecraft.server.v1_5_R3.MinecraftServer.a(MinecraftServer.java:243)
    at net.minecraft.server.v1_5_R3.DedicatedServer.init(DedicatedServer.java:151)
    at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:382)
    at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_R2.Item
    at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 13 more

In essence, what I wish it did was grab ALL lines after a "[SEVERE]" tag until it gets to another line that starts with "2013" or a "yyyy-mm-dd" pattern. In addition, I'd like it to grab the 10 lines the precede the [SEVERE] entry to help give me context.

Thanks for any help you can provide!
 

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