Convert RHEL-7 to CentOS

Wed 02 May 2018

I have tried to suggest update of Migration Guide for RHEL7→CentOS7 migration, but apparently after CentOS was bought by Red Hat, there is not enough desire to document such migration, ehm ehm. So, just recording this for posteriority:

cd /tmp
mkdir TMP
cd TMP
wget $URLBASE/centos-indexhtml-7-9.el7.centos.noarch.rpm \
    $URLBASE/centos-release-7-4.1708.el7.centos.x86_64.rpm \
    $URLBASE/yum-3.4.3-154.el7.centos.noarch.rpm \
subscription-manager remove --all
yum remove rhnlib abrt-plugin-bugzilla redhat-release-notes\* \
rpm -e --nodeps redhat-release-workstation redhat-indexhtml
for dir in /usr/share/redhat-release\;\* ; do rm -fv $dir ; done
rmdir /usr/share/redhat-release
rpm -Uvh *
yum clean all && rm -rf /var/cache/yum
yum upgrade
yum upgrade
yum distro-sync
package-cleanup --orphans
cd .. && rm -rf TMP

I am not sure what’s the deal with /usr/share/redhat-release*, but it is just necessary to get rid of all variants of such directory.

Category: computer Tagged: linux


Design notes on plan9-for-vimspace

Mon 04 December 2017


The purpose of this paper is to document any possible ideas, which could be salvaged from the Acme text editor of Plan9 fame, and reuse in vim.

(This is still a bit a work in progress, any comments and suggestions are more than welcome).

When I have seen for …

Category: computer Tagged: vim plan9 ACME GUI


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Harry Potter and The Jabber Spam

Fri 13 January 2017

After many many years of happy using XMPP we were finally awarded with the respect of spammers and suddenly some of us (especially those who have their JID in their email signature) are getting a lot of spim.

Fortunately, the world of Jabber is not so defenceless, thanks to XEP-0016 …

Category: computer Tagged: xmpp


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Firefox OS post-mortem

Sat 26 September 2015

So, it happened. My Flame stopped working, it just doesn’t react to anything (power off switch, power cable), and of course being a weird unknown China-only thing, no local repair shop would touch it. I probably could ask somebody at Mozilla for another one, but I already knew I …

Category: computer Tagged: firefoxOS review


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On bibshare

Thu 04 September 2014

(this is originally a comment on the post about “scientific Markdown”)

In my previous life I was using heavily TeX and BibTeX for writing a scholarly articles when working on my PhD in sociology. When doing a large BibTeX database of bibliopgraphy there is a certain moment when one needs …

Category: computer Tagged: TeX BibTeX bibliography metadata


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