Linux » rootsmith blog

ImportError: cannot import name fixtag

Sep 272011

Installing supervisor on Natty Nat will undoubtedly throw the error ImportError: cannot import name fixtag

The root cause of this error is the python-meld3 library and the following import statement:

from xml.etree.ElementTree import fixtag

The problem has been fixed in version 0.6.7 of python-meld3. Therefore, before you install supervisor, do the following on the command line as root:

aptitude install python-meld3
pip install meld3==0.6.7

The above will install version 0.6.5 of python-meld3 and then pip will upgrade it to the latest. You can then install supervisor without any problems.

If you want you can read the gory details of the problem in python-meld3.

MySQL data files .MYD, .MYI, and .frm

Linux, mysql, UNIX 26 Responses »

Mar 202009

A MySQL database creates a number of different data files in the mysql data directory (typically /var/lib/mysql). The following are the differences between the data files created:

File Extension	Purpose
.frm	table definition
.MYD	table data
.MYI	table indices

I believe these files are created for both MyISAM and InnoDB table types because the MySQL documentation references these types with respect to MyISAM and I definitely see them on my InnoDB tables.

I couldn’t find this information directly in the MySQL documentation and google wasn’t much help either so hopefully this post will save someone else some search effort.

Doing UNIX Shell For Loops The Right Way

Linux, UNIX No Responses »

Mar 162009

Typically for loops in UNIX shell look like this:

for file in `ls *.c`
do
    cmd $file
done

However, the above has a serious problem in that it does not handle spaces in file names and will actually split the filename in two.

The following is a solution in bash:

files=(*.c)
for f in “${files[@]}”
do
    cmd "$f"
done

But my favourite way to perform a loop and probably the most elegant solution is to use file globbing:

for f in *.c
do
    cmd "$f"
done

mobile me sucks

Apple, Linux 2 Responses »

Jul 212008

The one thing I have always hated about Microsoft is its predatory business practices that very deliberately try to undermine its competitors. The whole “embrace and extend” strategy of purposefully breaking standards bothers me on many levels. I am much more respectful of companies that concentrate on offering superior products and that is why I have always liked Apple. So, you can imagine my shock at seeing the following pop-up when I was evaluating Apple’s new Mobile Me service. Continue reading »

UNIX Access, Modify, and Change Times

Linux, UNIX 7 Responses »

Mar 312008

What is the difference between UNIX Access, Modify, and Change Times?

This is a silly little thing that I consistently forget … or at least forget some of the subtle differences between these three measures.
Continue reading »

Configuring Multiple trac Sites On One Host

Linux, python No Responses »

Mar 012008

It is possible to have more than one trac site on one host. This article explains how to accomplish this using apache, mod_python, and trac on a Red Hat based system (although the principles easily translate to Ubuntu based systems) so that each of your sites has an address like trac.example.com.

Using The Korn Shell and Not Going Mad

Linux, UNIX No Responses »

Feb 182008

This article describes common functionality that is often thought lacking in ksh but is just hiding in unintuitive corners (such as command line completion!)
Continue reading »

Logitech MX Revolution Mouse on Linux

Linux 4 Responses »

Dec 272006

This document describes setting up the Logitech MX Revolution Mouse on Linux, however, the process would be similar for any Logitech MX* mouse.
Continue reading »

Cisco VPN Client and Linux

Linux No Responses »

Apr 062005

If you are using linux kernel 2.6.9+ with the Cisco VPN client you may not be able to compile the vpn client. The other problem may be that the system will hang / freeze when using the Cisco VPN client with linux kernels 2.6.9 or greater.
Continue reading »

Linux on a Sony VAIO VGN-A170P Laptop

Linux No Responses »

Oct 202004

This article describes installing and running Linux, specifically Fedora Core distro, on a Sony VAIO Series A Laptop (VGN-A170P).

Older Entries

Suffusion theme by Sayontan Sinha

rootsmith blog