Removing duplicate RPMS.

Got the script mainly with google search on the <a href="http://linux.derkeiler.com/Mailing-Lists/Fedora/2006-12/msg04156.html">link.

Nice trick..

Get the list of rpms with just the names
rpm -qa –queryformat &#8217;%{name}\n&#8217; > pkglist

Get the non-uniques list.
sort -g pkglist | uniq -d > duplicates

Get the versions of the duplicate files:
for pkg in `cat duplicates`; do
rpm -q $pkg » removelist
done

Now keep the rpms that you want to delete in the removelist

vi – the powerful Linux/Unix text editor

We will talk about some vi stuff today:

Some fun first–>
1) <a href="http://www.vim.org/tips/tip.php?tip_id=664">http://www.vim.org/tips/tip.php?tip_id=664
2) help 42

Ok, coming to serious things-
References:
3) Linux cheat sheet:
<a href="http://www.lagmonster.org/docs/vi2.html">http://www.lagmonster.org/docs/vi2.html
4) <a href="http://www.venukb.com/2007/01/28/vivim-graphical-cheat-sheet/">http://www.venukb.com/2007/01/28/vivim-graphical-cheat-sheet/
5) <a href="http://www.eng.hawaii.edu/Tutor/vi.html#commands">http://www.eng.hawaii.edu/Tutor/vi.html#commands

Commands and tips:
6) Something that is difficult to find on the net is : how to create a numbered list in vi/vim? Simple, we will use macro's
To do this:
a> type number and terminatory ex: 1)
b> start recording using qa  . This will record the macro in a.
c> yank the line with yy
d> goto next line
e> press a to increment the number
f> End the macro recording with q
g> Play the macro with numner of times to repeat the actions. Example press 11@a
7) For repeating the last command you can use
8) You can put your vim settings in ~/vimrc and this can containg things like "set nu" and any other configuration.
9) Adding date in vi : :r! date
10) There is a variant of vi known as elvis which is quite nice
11) Similarly for viewing binary file there is a variant called bvi

Pipe stdout and stderr, etc., to separate commands

$ some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr) You can use [n]> combined with >(cmd) to attach the various output file descriptors to be the input of different commands.

Easier Reinstalls

<span style="font-size: x-large;"><a href="http://www.howtoforge.com/easier-reinstalls">E<a href="http://www.howtoforge.com/easier-reinstalls">asier Reinstalls

Easier Reinstalls

I typically reinstall my computer operating system every six months. The reasons for this are that it cleans out the system and reinstalls require me to be in front of the computer for a total of about ten minutes so it&#8217;s painless. Notice I said &#8221;in front of the computer&#8221;, the system does all of the work for me with some specially crafted bash scripts.

coproc help - a new feature in bash

In the <a class="zem_slink freebase/en/bash" title="Bash" rel="homepage" href="http://tiswww.case.edu/php/chet/bash/bashtop.html">bash version 4.0, there is a new concept called coproc. This is very useful for some of the daily tasks.

co-<a class="zem_slink freebase/guid/9202a8c04000641f800000000005a409" title="Process (computing)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Process_%28computing%29">process starts a process in the background, optionally with a NAME, with which other processes can communicate. This can be a very <a class="zem_slink freebase/en/substitute_good" title="Substitute good" rel="wikipedia" href="http://en.wikipedia.org/wiki/Substitute_good">good substitution for <a class="zem_slink freebase/guid/9202a8c04000641f800000000048fac5" title="Pipeline (Unix)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Pipeline_%28Unix%29">pipes in lots of cases. You can learn more about coproc in the link below:

Transfer all the google feed URLs to rss2email.

Next step in restoring my settings was to get the working rules and all the blogs into rss2email. I have subscribed to more than 150 blogs. So, adding all of them manually was difficult.

For a time like this, I subscribe to all the blogs using google reader and then add them to rss2email. So I had quickly exported the google feeds list and then had to find a way to extract the URLs for the blog to the rss2email. The command to add a url is r2e add, so I wrote this one line just now to do the task for me.

Post your free classifieds.

I have put up a free classifieds site here:

<a href="http://noah.amit-agarwal.co.in/" target="_blank">http://noah.amit-agarwal.co.in/