Miroslav Mirkov

RPM: List all installed packages by size

Miroslav Mirkov — Wed, 04 May 2016 17:19:23 +0000

 shell$ rpm -qa --queryformat '%10{SIZE}\t%{NAME}\n' | sort -k1,1n

Enable “Subject:” logging in Postfix

Miroslav Mirkov — Thu, 21 Apr 2016 19:06:27 +0000

Edit the Postfix’s main.cf file and add the following line (or uncomment it):

header_checks = regexp:/etc/postfix/header_checks

Create /etc/postfix/header_checks file and add the following line:

/^subject:/ WARN

Finally, reload/restart Postfix. From now on there will be a “warrning: header subject” in your maillog.

Dirty Little Secrets

Miroslav Mirkov — Mon, 04 Apr 2016 14:27:39 +0000

You can find them here: http://interactive.fusion.net/dirty-little-secrets/

Quick Fix: Support for HiDPI in Caprine for Windows

Miroslav Mirkov — Wed, 23 Mar 2016 21:45:02 +0000

In order to fix the wired looking (small) font of Caprine for Windows you just have to change (add) the “zoomFactor” parameter in ressources\app\index.js right after webPreferences:
zoomFactor: 1.2,

Save the file and re-run the app. The font should be readable now.

More about Caprine – https://github.com/sindresorhus/caprine

CentOS: Change default MTA (Mail Transfer Agent)

Miroslav Mirkov — Sat, 22 Aug 2015 14:19:34 +0000

Here’s a simple way to change your default MTA on CentOS:

# alternatives --config mta

There are 2 programs which provide 'mta'.

  Selection    Command
-----------------------------------------------
*+ 1           /usr/sbin/sendmail.sendmail
   2           /usr/sbin/sendmail.ssmtp

Enter to keep the current selection[+], or type selection number: 2

# sendmail -V
sSMTP 2.61 (Not sendmail at all)

PIP – update all Python packages

Miroslav Mirkov — Wed, 19 Aug 2015 17:01:04 +0000

pip freeze --local | grep -v '^\-e' | cut -d = -f 1 | xargs pip install -U

Windows 10 – God Mode

Miroslav Mirkov — Mon, 03 Aug 2015 16:49:25 +0000

To activate God Mode, right-click the desktop and select New > Folder. Highlight this folder, press F2 and name it:

GodMode.{ED7BA470-8E54-465E-825C-99712043E01C}

FIX: aws-cli – AWS was not able to validate the provided access credentials

Мирков — Tue, 14 Jul 2015 20:47:29 +0000

Simply adjust / sync your server’s clock in case you get the following error message while using aws-cli – “AWS was not able to validate the provided access credentials”

CentOS: Clear cached memory

Miroslav Mirkov — Tue, 15 Apr 2014 19:16:10 +0000

Use the following command to clear you cached memory:

root@linux [~]# echo 1 > /proc/sys/vm/drop_caches

gem install rmagick – Can’t find Magick-config (CentOS 6)

Miroslav Mirkov — Sat, 01 Feb 2014 17:51:08 +0000

In case you receive the mentioned error while trying to install rmagick then simply issue the following:

# yum install ImageMagick-devel

Once ImageMagick-devel is installed then you can retry installing rmagick using:

# gem install rmagick