Ubuntu Pop Art Bug

Here is another interesting bug I discovered today on my Ubuntu GNU/Linux laptop. The console takes on these really Andy Warhol style pop art colors when I power down the system into sleep mode and back.

Error messages on the console screen

Debian console getting flooded with error messages and verbose warnings can be quite trying for anyone.

Previous versions Debian Reference (Section 8.6.8) used to provided a solution viz… Running “dmesg -n X” (where X is the error levels [1..7) to quiet on-screen error messages until next reboot. Or set KLOGD=”-c 3” in etc/init.d/klogd script and run /etc/init.d/klogd restart for more lasting effect.

David Clarke provides the new way of handling console errors nicely.

Add a single line is your /etc/sysctl.conf and upon every reboot the given values are set to the linux kernel printk() .

kernel.printk = 3 4 1 7

The four values we are setting in /proc/sys/kernel/printk stand for:

• console_loglevel – messages with a priority higher than this will be printed to the console

• default_message_loglevel – messages without an explicit priority will be printed with this priority

• minimum_console_loglevel – minimum (highest) value to which console_loglevel can be set

• default_console_loglevel – default value for console_loglevel

These values influence printk() behavior when printing or logging error messages. See syslog(2) for more info on the different loglevels. For more information on other /proc files is read LinuxInsight /Proc Documentation

Guide to Unix/Linux Commands

In October 2005 I contributed to the Guide to Unix/Linux commands wikibook. It is targeted at users who want to learn the shell commands by typing them on a Unix or gnu/Linux console. The wikibook is nowhere near complete but I guess it would be a good start if want to master the shell. For experienced users I request you to spare some time and contribute to this wikibook. If possible please try to adopt this documentation project.

The Guide to Unix/Linux Commands

The Guide to Unix/Linux command line is often considered difficult to learn. This book aims to help beginners by introducing various commands in lucid and simple language. Unlike most command references, this book is designed to be a self-study guide.

Contents

• Getting Help man info apropos whatis makewhatis
• File System Utilities ls mkdir cd pwd chroot cp mv rm touch df link ln unlink chown chmod mount
• Finding Files find whereis which locate
• File Viewing cat more less od head tail
• File Editing pico nano zile vi joe emacs
• File Compression gzip gunzip zcat gzcat tar pax bzip2 zip compress
• File Analysingfile wc cksum stat
• Multiuser Commandswho finger su
• Self Information whoami groups id tty
• System Information uptime uname dmesg free vmstat 50% top df hostname
• Networking ifconf ifdown ifup
• Process Managementnohup ps kill pgrep pidof killall
• Devices fuser lsof fstat
• Kernel Commands lsmod modprobe sysctl
• Compress Commandstar cvf | tar xvf bunzip2
• Miscellaneous sync echo cal date time mail clear PS1