jaux.net

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Number to Word

10 = deca

100 = hecto

1,000 = kilo

1,000,000 = mega

1,000,000,000 = giga

1,000,000,000,000 = tera

1,000,000,000,000,000 = peta

1,000,000,000,000,000,000 = exa

1,000,000,000,000,000,000,000 = zetta

1,000,000,000,000,000,000,000,000 = yotta

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Disable Bell in VIM

" Disable both beep and visual flash
set visualbell t_vb=

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Nothing Could Fail in C

Best comment of the C programming language ever!

via:reddit

Here is the whole story:

Going back to C
by buddhabrot

When I was 12 someone gave me a Metrowerks IDE to learn programming on my mac. I learned a lot with it, and got programming in C. I never really wrote a large program in it, only things like ROM hacks that extracted levels and models from snes/psx games I liked. Later, I got a windows PC and messed around with MFC in C++. That was the end for me, programming UI’s was too much work in C++ and I couldn’t handle the encyclopedic knowledge needed to program the Microsoft framework.

Later, I learned Java, which was also the language most commonly in my college. Making UI’s was a blast with it, I could factorize anything and really loved making as generic code as possible with it, even for small projects. Everything I made was made in Java.

Later in uni, I started learning functional languages, we used Haskell in one class. I got intrigued with Haskell and started solving Euler problems, up to this day I still have not written anything useful in Haskell but I love using it.

In the mean time I did some jobs for writing web sites. I used perl and php. After a while I only used php and used it more frequently.

After working for a while as a programmer I started to love higher-level languages, most of all Ruby. I became convinced that higher-level interpreted languages were the future because the slower execution times were to become meaningless. For any web projects I started using Ruby on Rails and to this day it still is my favourite framework.

Then, I learned Erlang because everyone was talking about it, and it showed me how to unleash parallellization, in whole new ways. I still think Erlang is the most amazing language I have ever seen. But then I found out it was also rather slow for the things I had in mind with it. I just didn’t find any use for it and never completely learned the language.

Last week I wanted to make a big poster of a fractal. I wanted to compute it on a friend’s octocore, and write a fast parallellized program. At first, I used Ruby, thinking it would perform better than I thought. And I quickly abandoned the idea because it was too slow.

Then I rewrote the same single-threaded algorithm in Haskell and saw that it was much, much quicker. But when I tried to parallallize it, I couldn’t fathom how to do it in Haskell and abandoned the idea. I tried to write a parallellized version in Erlang, and while it spreak across the machine nicely, each individual process was way too slow, the parallellized algorithm was hundreds of times slower than the single-threaded haskell.

Because I really wanted that poster, I decided to switch to C because I had this idea that nothing could fail in C. And I started to code in a language I hadn’t used for years, even a decade. And suddenly it hit me, everything made sense. Sure, I was writing so much boilerplate but it didn’t bother me. I suddenly realized that everything I wrote would be inside the program’s code, and that nothing more would. It was a great feeling.
I used simple pthreads to do the parallellization, and I used libgd to output my data to a png file. I started learning about mutex lock hierarchies to make the parallellizations overlap without endangering thread safety, it was all ugly code and the API’s felt horrible compared to what I was used to.. but it all worked out. The resulting program was thousands of times faster than anything I had written.

And now, I am seriously wondering where I have been all this time. Sure, I still think C is incredibly clunky. But now I got the dust off of my old course on writing compilers (Modern compiler implementation in C), and I want to write a compiler in C for a small programming language. I want to get down to earth again, and write things that are efficient and just run very quickly. I want to write lots and lots of code and know exactly what every line does.

Has anyone else had this feeling, this evolution? Am I going mad? Do you think C will last, and there are intersting jobs left for pure C developers?

I have the same question: Are there intersting jobs left for pure C developers?

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“–” (Double-hyphen) in Bash

$cat out
if [ $# -eq 0 ]
    then
        echo "Usage: out [-v] filenames..." 1>&2
        exit 1
fi
if [ "$1" = "-v" ]
    then
        shift
        less -- "$@"
    else
        cat -- "$@"
fi

In out the -- arguments to cat and less tells these utilities that no more options follow on the command line and not to consider leading hyphen (-) in the following list as indicating options. Thus -- allows you to view a file with a name that starts with a hyphen… -- argument works with all Linux utilities that use the getopts builtin… This argument is particularly useful when used in conjunction with rm to remove a file whose name starts with a hyphen (rm -- -fname)…

A Practical Guide to Linux Commands, Editors and Shell Programming (p. 442)

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Handle Filenames with Spaces Properly in Bash Loops

find ~ -name '* *' | while read FILE
do
    echo "$FILE rocks."
done

via Handling Filenames with Spaces in Bash