Hwarf Nugen

Perl Find and Replace One Liner

jglemza — Thu, 21 Jan 2010 01:37:18 +0000

I’m constantly needing a way to easily change a line in a bunch of configuration files. I thought I’d share the way I do it here.

perl -p -i -e 's/oldstring/newstring/g' *

This allows you to use a regular expression and perform the find and replace.

Caribbean Cruise 2009

jglemza — Wed, 21 Oct 2009 14:58:22 +0000

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Lake Michigan Motorcycle Trip Pictures

jglemza — Fri, 07 Aug 2009 02:21:58 +0000

Here’s the few shots that were taken while Dad and I were out touring Lake Michigan.

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Cleveland Metroparks Zoo – PACE Summer Picnic

jglemza — Sun, 19 Jul 2009 01:16:28 +0000

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BlackBerry Wordpress

jglemza — Fri, 17 Jul 2009 02:34:48 +0000

This was posted via the new Wordpress Blackberry application. Be sure to check it out. Wordpress.org

HOWTO: Set the SSHD Idle Timeout

jglemza — Wed, 24 Jun 2009 14:03:37 +0000

Here’s something that I usually forget to change from the default and then get annoyed when my terminal hangs.

As root open your sshd_config file in an editor.
su -
vim /etc/ssh/sshd_config
Add the following lines.
ClientAliveInterval 600
ClientAliveCountMax 3
Restart the sshd process.
service sshd restart

That’s it. That will keep you logged in for 30 minutes at a time without activity. (600 seconds x 3)

Motorcycle Trip 2009 – Lake Michigan

jglemza — Mon, 15 Jun 2009 23:55:07 +0000

Below is the initial route for Dad and I’s motorcycle trip for 2009. We’re going to be traveling July 25th – July 30th. The only set in stone destination is Oshkosh, WI for Airventure.

View Larger Map

M3U Playlist Copy Script

jglemza — Sat, 04 Apr 2009 19:58:00 +0000

A couple of months ago I picked up a Garmin Nuvi 760 on the cheap. As it turns out this great GPS unit can also play music quite well, especially for riding on the motorcycle. The only problem was there was no good way to get playlists on the device that I could find. Enter the following bash script. This script will read an m3u file, copy all associated mp3 files, and generate a new m3u file. Now all I have to do is specifiy m3u files that I exported from Mozilla Songbird and the path to the Garmin’s SD card.

#!/bin/bash
# April 4, 2009
# m3u_cp.sh
#
# Take an m3u file and copy all associated mp3 files
# to a destination directory and generate a new m3u.
#
# Used to copy m3u playlists from computer to Garmin.

if [ $# -lt 2 ]; then
echo "Usage: m3u_cp.sh some.m3u /dst"
exit 0
fi

# Read the m3u file into an array
declare -a M3U
exec 10<"$1"
let count=0

while read LINE <&10; do
M3U[$count]=$LINE
((count++))
done

exec 10>&-

# Determine the m3u's filename
if [[ $1 =~ [^/]*m3u ]]; then
m3u_path="$2/$BASH_REMATCH"
fi

# If playlist arleady exists, delete it
if [ -f "$m3u_path" ]; then
rm -f "$m3u_path"
fi

# Loop through the m3u lines
i=0
while [ $i -lt ${#M3U[@]} ]; do
# The current line is a comment, do nothing with it
if [ ${M3U[$i]:0:1} = "#" ]; then
echo ${M3U[$i]} >> "$m3u_path"

#Current line is a path to an mp3 file
else
# Get the current songs filename
if [[ ${M3U[$i]} =~ [^/]*mp3 ]]; then
song=$BASH_REMATCH
mpath=$( echo ${M3U[$i]} | tr -d '\r' )

# if the song doesn't exist, copy it to the desitnation folder
if [ -f "$2/$song" ]; then
echo File Exists -- $song
else
echo Copying -- $song
cp "$mpath" "$2/$song"
fi

# Write the song in the m3u file
echo $song >> "$m3u_path"
else
echo "The regex for finding the song's filename is fraked up."
fi
fi

let i=i+1
done
exit 0

In the middle of writing this I really started wondering why I used bash. Perl would’ve been a lot easier.

SVN+SSH Howto: Subversion Quick and Simple

jglemza — Wed, 11 Mar 2009 13:57:36 +0000

Here’s a quick and simple way to create a Subversion repository while maintaining security by using SSH and the filesystem permissions.

Create users and add them to a group. There are a bunch of different ways to do this. I am only showing you how to create a group.
groupadd svn-users
Make a directory to house the repository.
mkdir /var/lib/project
Create the repository.
svnadmin create /var/lib/project
Change permissions to allow the group read/write access.
cd /var/lib/project
chgrp svn-users db db/transactions db/write-lock db/revs db/revprops hooks locks
chmod 2770 db db/transactions db/revs db/revprops
chmod 660 db/write-lock
chmod 750 hooks
chmod 770 locks

You can now have your users access the repository over SSH.

svn+ssh://username@server.example.com/var/lib/project

If your clients are on Windows, I recommend using TortoiseSVN.

Credit goes to the Carnival of Technology.

Installing Fedora 10 on the Acer Aspire One

jglemza — Mon, 26 Jan 2009 22:10:37 +0000

After many hours of playing with my Aspire One I have settled on Fedora 10 for my distro of choice. A lot of this guide have been adopted from, The road to Elysium blog. However, I prefer to use GNOME and the Ext4 filesystem. I have not noticed performance hit from using Ext4.

These steps are intended to be performed from top to bottom and in order.

My Hardware

Acer Aspire One (A150)
- 1.5GB RAM
- 60GB OCZ SSD
- 6-Cell Battery
USB Flash Drive

Live CD Creation

Download the Fedora 10 Live CD. (681MB)
Download UNetbootin. Linux (3.6MB) Windows (3.8MB)
1. If you’re using the Linux version, remember to do the following. Be sure to run the program as root.
  chmod 755 unetbootin-linux-307
  sudo ./unetbootin-linux-307
Open UNetbootin and load the Fedora ISO on it. Look at the configuration below.
Select your flash drive in the drop down box.

Live CD Installation

Insert your USB flash drive into the Aspire One.
Press F12 at the BIOS prompt.
Select your USB KEY as the location to boot.
Once you are on the Live desktop, double-click on “Install to Hard Drive.”
Continue through the installation process. When presented with the partition choices, choose “Custom Partition Layout.”
Delete all partitions on the drive.
Create the boot partition. (This will most likely become /dev/sda1)
1. Mount Point: /boot
2. Filesystem: Ext2
3. Size: 200MB
Create the root partition. (This will become /dev/sda2)
1. Mount Point: /
2. Filesystem: Ext3
  *It doesn’t matter which filesystem you choose. It will be Ext3 no matter what. This is due to the way the Live CD installs itself. It does a dd of the live image to the hard drive.
3. Size: Remaining free space
Continue with the installation. Once the image is transferred you will need to reboot.
Once the system boots the installer will ask you a few more questions.

Disable SELinux

After the installation is completed you need to disable SELinux. Edit /etc/sysconfig/selinux to look like the following.
SELINUX=disabled

Converting the Ext3 Filesystem to Ext4

Reboot the machine and load the Live CD once again.
Open a terminal. (Applications -> System Tools -> Terminal)
Mount the local disk.
su -
mkdir /mnt/disk
mount /dev/sda2 /mnt/disk
mount /dev/sda1 /mnt/disk/boot
mount -o bind /sys /mnt/disk/sys
mount -o bind /proc /mnt/disk/proc
Change the root filesystem.
chroot /mnt/disk /bin/bash
Edit the /etc/fstab file. Change the root filesystem from ext3 to ext4. Example below.
/dev/sda2 / ext4 defaults 0 0
Run a filesystem check.
fsck -pf /dev/sda2
Convert to ext4.
tune2fs -O extents,uninit_bg,dir_index /dev/sda2
Run another filesystem check.
fsck -pf /dev/sda2

Creating the New Initial Ramdisk Image

Change the current working directory.
cd /boot
Move the old image.
mv initrd-2.6.27.5-117.fc10.i686.img initrd-2.6.27.5-117.fc10.i686.img.ext3
Create the new initial ramdisk.
mkinitrd initrd-`uname -r`.img `uname -r`
Exit the chroot environment.
exit
Unmount filesystems.
cd
umount /mnt/disk/boot/
umount /mnt/disk/sys/
umount /mnt/disk/proc/
umount /mnt/disk/
Reboot the system.
reboot

SSD Optimization

Perform the following if you’re using an SSD. If you’re using a hard drive you can skip this section.

Create Ramdisks to Store Frequently Written Areas

Edit your /etc/fstab file. Add the following lines.
tmpfs /var/log tmpfs defaults 0 0
tmpfs /tmp tmpfs defaults 0 0
tmpfs /var/tmp tmpfs defaults 0 0

Disable Access Time Attributes

Edit your /etc/fstab. Modify the root partitions settings. Add noatime and nodiratime to defaults.
/dev/sda2 / ext4 defaults,noatime,nodiratime 0 0

Optimizing the Kernel

Add the following to your /etc/rc.local file.
# Economize the SSD
sysctl -w vm.swappiness=1 # Strongly discourage swapping
sysctl -w vm.vfs_cache_pressure=50 # Don't shrink the inode cache aggressively

# As in the rc.last.ctrl of Linpus
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo ondemand > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate

echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
echo 20 > /proc/sys/vm/dirty_ratio
echo 10 > /proc/sys/vm/dirty_background_ratio

echo 1 > /sys/devices/system/cpu/sched_smt_power_savings
echo 10 > /sys/module/snd_hda_intel/parameters/power_save
echo 5 > /proc/sys/vm/laptop_mode

#Decrease power usage of USB while idle
[ -w /sys/bus/usb/devices/1-5/power/level ] && echo auto > /sys/bus/usb/devices/1-5/power/level
[ -w /sys/bus/usb/devices/5-5/power/level ] && echo auto > /sys/bus/usb/devices/5-5/power/level

/sbin/setpci -d 197b:2381 AE=47
/sbin/modprobe pciehp
/sbin/modprobe sdhci

Change the I/O Scheduler

Edit the /etc/grub.conf file. Add “elevator=noop” to the kernel line.
kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=/dev/sda2 rhgb quiet elevator=noop

General Optimizations and Improvements

These are some tips and tricks that should help improve the Fedora experience for everyone.

Fix SD Card Reader Issues

Create a file in /etc/modprobe.d to blacklist a module.
echo "blacklist jmb38x_ms" > /etc/modprobe.d/blacklist-msreader

Disable Unnecessary Services

Run the following to disable numerous services that are irrelevant to most netbook situations.
for s in atd auditd avahi-daemon bluetooth cups cpuspeed gpm ip6tables kerneloops mdmonitor netfs nfslock portreserve rpcbind rpcgssd rpcidmapd sendmail setroubleshoot livesys livesys-late microcode_ctl; do echo "chkconfig $s off"; chkconfig $s off; done
I have disabled the CPU throttle service. I prefer to have the full performance. I’m not sure how much more power is used.

Use the Madwifi Kernel Module

This is optional. By using this module instead you can get the wifi led lights to blink while there is network activity.

Install the RPM Fusion repository.
rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm
Install the madwifi kernel module.
yum install madwifi
Add the following to your /etc/sysctl.conf file.
dev.wifi0.ledpin = 3
dev.wifi0.softled = 1

Using a Better Sound Module

Create a file in /etc/modprobe.d to load the correct sound module.
echo "options snd-hda-intel model=acer-aspire" > /etc/modprobe.d/sound

New Startup Graphics

Edit the /etc/grub.conf file. Add vga=0×315 to the kernel line.
kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=/dev/sda2 rhgb quiet elevator=noop vga=0x315

Enable gsynaptics

Create /etc/hal/fdi/policy/10-synaptics.fdi with the following contents.
<?xml version="1.0" encoding="ISO-8859-1"?>
<deviceinfo version="0.2">
<device>
<match key="info.capabilities" contains="input.touchpad">
<match key="info.product" contains="Synaptics TouchPad">
<merge key="input.x11_driver" type="string">synapticsmerge>
<merge key="input.x11_options.SHMConfig" type="string">Onmerge>
match>
<match key="info.product" contains="AlpsPS/2 ALPS">
<merge key="input.x11_driver" type="string">synapticsmerge>
match>
<match key="info.product" contains="appletouch">
<merge key="input.x11_driver" type="string">synapticsmerge>
match>
<match key="info.product" contains="bcm5974">
<merge key="input.x11_driver" type="string">synapticsmerge>
match>
match>
device>
deviceinfo>
Install gsynaptics.
yum install gsynaptics

Silence the CPU Fan

Download the following two scripts. acerfand (4.4K) acer_ec.pl (8.3K)
As root move the files to /usr/local/bin
su -
mv acerfand /usr/local/bin/
mv acer_ec.pl /usr/local/bin/
Change the permissions on the scripts.
chmod 755 /usr/local/bin/acerfand
chmod 755 /usr/local/bin/acer_ec.pl
Add a line to your /etc/rc.local file to start at boot.
echo "/usr/local/bin/acerfand" >> /etc/rc.local

Reboot

After you have performed the optimizations must reboot. Many of the customizations require a reboot before they will work.