get the contents of whole site like some wiki or wikia

For wikis and wikia, generally if you are trying to get some url mirror, then websucker.py is an excellent option. This script is in the python sources so, to get this tool,

yumdownloader --source python

Install the rpm downloaded in current directory and then go to ~/rpmbuild/SOUURCES.  You should find a Python-*.tar.xz file here, just extract with

tar xvf Python*.tar.xz

and there you go, you should find the tool in Tools/webchecker/websucker.py.

bash debug – log all executed commands

Whenever I am writing a script in perl or bash, I always wish that there
was some way to have all the commands logged or output to screen. I know
there is “set -x” option to have debugging enabled, but sometimes that
seems to be too much information and I dont really need all that. So, here
is something I found recently for bash to log all the executed commands.

vim mappings – easy way to do things.

You can use vim mappings to make some of your editor tasks very simple. Here I am giving you just a example, but you could always let your imagination run wild.

:nmap ,b Oj0c$**hP

And what do we do here.

O – Add a new line

– Go to normal mode

j – go to newly added line

0 – Go to begining of line

c$ – Change till end of line

Continue reading

Fix typescript files generated with script command

Generally quite a lot of us would have used the script command. This generates the logs for the session. But the problem with the logs is that it contains a lot of un-readable characters. These characters are mostly from the color codes, and as such can be removed very easily with a single command:

cat typescript | 
 perl -pe 's/e([^[]]|[.*.*?[a-zA-Z]|].*?a)//g' | col -b > typescript-processed

This assumes the input log file is named as typescript and the output is kept as typescript-processed. You can change the names as required.

remove the background the easy way — online

Here is a nice link to web application that lets you remove the unwanted background. Just head over to the side, follow the simple instructions of marking the background and the subject and you are done.

http://clippingmagic.com/

Pretty good results you will get here, you may need to do a little work on the results but otherwise pretty good results.

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create text tables from delimited files.

To create simple text tables to paste in emails or to use in any other document where you want to show a table, here is something that you can use. There is a perl module which provides “tablify“. And here is how to use it:

sudo yum install perl-Text-RecordParser

This will install a command “tablify” that you can use in number of ways. Here is a simple example to use it. You can read the man pages to see how you can use it.

Vim – Why and where am I getting these errors from?

If you have got this question in your mind, then you are in right place.

vim -V20  2>&1 |tee

You can give the debugfile as any file, where you would want to log the debug messages. This will log a lot of information in the debugfile, you can open the file, once you have got the error in the main vim window. After this, you can open the debugfile and simply search for the error that you were getting. Just look for the reason why this error is originated in the debug logs and then it should be pretty simple to fix that.