Vim Tip – Convert Code To HTML
If you wrote some elegant code, and want to publish it as a HTML page, you can easily do that in vim:
In command mode, type this:
:TOhtml
A new buffer will be opened with the HTML source, just save it:
:wq
If the original file name was “mycode.c”, you’ll find a new file in the same directory named “mycode.c.html”. Open it with your favourite web browser.
Wow, not?
Have fun 
Bash Tip – Separate a Bash Variable From Surrounding Letters
Sometimes, you might find yourself needing to concatenate the value of a bash variable with a string.
I think it’s best demonstrated with (a somewhat artificial) example:
1 2 3 | y=h echo $yome #won't work. will print the value of the variable "yome" which is a null string (since it's not set) echo ${y}ome #works. will print "home" |
That’s it, the trick is to use the curly brackets ${var} to separate the variable from its surrounding.
Have fun
source: @bashcookbook
Finding The Median Of Two Sorted Arrays
This is one of the beautiful cases where solving the general case first, and then applying it to a particular case is simpler and smoother than solving the particular case at once.
The problem:
Given two sorted arrays, “a” and “b”, with sizes “sa” and “sb” respectively, find the median of the union of these arrays.
Complexity requirements: O(log(sa + sb)) in the worst case, both time and space.
There are a few solutions for this problem, but non of them is as intuitive as the solution of a more general problem: The Select Problem:
Given two sorted arrays, “a” and “b”, with sizes “sa” and “sb” respectively, find the k-th smallest element of the union of these arrays. Under the same complexity requirements as above.
Array Indexing in C
I found this interesting thing about array indexing in C somewhere in the web:
Suppose that “a” is an array. Then, a[5] and 5[a] are quivallent. Both are interpreted as *(5 + a) or *(a + 5) which is the same 
Also: “Hello World”[3] and 3["Hello World"] are the same. Try and C
Infinite zip File
A nice idea: How to build an infinitely recursive zip file. Details and resulting file here:
http://www.steike.com/code/useless/zip-file-quine/
Have fun
Blogging From BlackBerry
Posting from BlackBerry using WordPress app for BlackBerry.
You can install the application to your BalckBerry from here: http://blackberry.wordpress.org/install
Have fun
Wisdom by Python (Easter Egg)
An easter egg by python displays a list of quotations, useful in programming and in many cases in life as well.
In your shell, type this:
1 | python -c 'import this' |
You’ll get this:
The Zen of Python, by Tim Peters
Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren’t special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one– and preferably only one –obvious way to do it.
Although that way may not be obvious at first unless you’re Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it’s a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea — let’s do more of those!
via commandlinefu
Have fun
Fix Facebook Chat in Firefox 3.5 (Shiretoko) in Ubuntu
Since I upgraded Firefox to 3.5 (Codename : Shiretoko), I noticed that Facebook chat does not work anymore, moreover, in order to get notifications for new events, I had to refresh the page manually.
After a search at Google, I found the problem, and the way to fix it: Looks like Ubuntu had decided to rename the user-agent into “Shiretoko” which is the codename of firefox 3.5, instead of “firefox”.
Because of the new user-agent name, Facebook does not recognize the browser as firefox, and thus disables some features that are browser dependent.
In order to fix the problem:
1. In the URI bar (that’s the place where you type the URLs of websites you want to visit), type “about:config” (without the double quotes).
2. Click the funny button “I’ll be carefull, I promise”.
3. Now look for “general.useragent.extra.firefox”, right click it, and choose “Modify”.
4. Instead of “Shiretoko”, type “Firefox”. (e.g. if you had “Shiretoko/3.5.4pre” it should become “Firefox/3.5.4pre”.
That’s it, now the world should be a better place
via vimtips.
Embed A Document Using Google Docs
You can embed a document viewer for any PDF or PPT using Google Docs.
You will get something similar to this:
The code I used for the above is:
1 |
Or in general:
1 |
Where DOCUMENT_URL_HERE should be replaced by the document’s URL
via Google Operating System.
Smile
Re-Use A Bash Command With Different Parameters
Suppose you have typed and executed this command in your Linux shell:
1 | ./script_a.sh 1.23 && ./script_b.sh 1.23 && ./script_c.sh 1.23.45 |
Now you want to run the same command, but with 2.34 instead of 1.23
A nice way to do it is this:
1 | !!:gs/1.23/2.34 |
Meaning, run the last command (!! is also called ‘bang bang’, and it’s substituted by the last command you executed), and replace every instance of 1.23 by 2.34
via Unix Bash Scripting.
Have fun
About Me
My name is Amir Watad. I have a BSc. in biomedical engineering from The Biomedical Engineering school , Technion , Israel, and a BSc. in electrical engineering from The Electrical Engineering school , Technion , Israel.
I'm a Verification Engineer in Mellanox Technologies Ltd.
I love Linux, the Command Line and the OpenSource Community.
I used to write Poems (Arabic) when I was able to find time for this.
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