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ឥឡូវនេះខែវិច្ឆិកាហើយ ប៉ុន្តែខ្ញុំមិនទាន់បាន​សរសេរ​អត្ថបទ​មួយឡើយ។ អញ្ចឹង គួរតែ​ចាប់ផ្តើម​មួយទៅមែន​ទេ? ថ្ងៃនេះខ្ញុំចង់ចែករំលេករបៀបលុប audio track ចេញពីឯកសារ MKV ។ MKV ជា​ប្រភេទ​មួយ​នៃ​ហ្វមម៉ាត​របស់​ឯកសារ (file format) ដែល​យើង​អាច​ខ្ចប់​វីដេអូ សម្លេង និងសាប់ថាយថើល (subtitle)។ល។ ខ្ញុំមានឯកសារ MKV ដែលមានសំលេងពីរ ហ៊ីនឌី (Hindi) និងអង់គ្លេស ហើយ ខ្ញុំចង់លុបហ៊ីនឌីចេញ ដោយប្រើកុំព្យូទ័រជាមួយហ្វឺដរ៉ា (Fedora 24)។ ជាដំបូង យើងត្រូវបញ្ចូលប្រូក្រាមមួយជាមុនសិន។ # dnf install mkvtoolnix ក្រោយពីបញ្ចូលប្រូក្រាមខាងលើ យើងអាចមើលថាតើមានអ្វីខ្លះនៅក្នុងឯកសារ MKV នោះ។ $ mkvmerge -i Sample.mkv File 'Sample.mkv': container: Matroska Track ID 0: video (MPEG-4p10/AVC/h.264) Track ID 1: audio (MP3) Track ID 2: audio (AAC) Track ID 3: subtitles (SubRip/SRT) Attachment ID 1: type 'image/jpeg', size 298984 bytes, file name 'Cover....

This evening I need to extract a file with .7z extension. Guess what? I don’t know how to do that. I probably don’t even have 7zip program installed on my Fedora machine. Here’s something to remind myself how to get it working. First let’s find out what package we need to install: So, it seems we need to install p7zip. Okay. What is the command to run? My guess is that there should be one or two file in /usr/bin....

Let’s say I have a partition as /dev/sdc1 formatted using XFS file system, and I want to give a label to it as externo. Here is one way to do it: # xfs_admin -L externo /dev/sdc1 writing all SBs new label = "externo" To read the label: # xfs_admin -l /dev/sdc1 label = "externo" Reference: HowTo Rename a XFS-Filesystem (label it)

Today I successfully upgraded my FreeBSD home nas server from 10.3 to 11.0. This is the final release of version 11.0, though the official announcement is expected to be made on September 28. After the system upgrade, I need to also upgrade the 2 zpools (tank and zroot) so they can have new features. Upgrading tank was easy, all I needed to do was running this command: # zpool upgrade tank This system supports ZFS pool feature flags....

Yesterday I installed spamassassin package on a server running RHEL 6.8. Then this morning, I received an email alert with the following message: This seems to be a bug exists in an old version of IO::Socket::INET6. Upgrading this package should fix the problem: Ref: http://stackoverflow.com/questions/23909848/perl-iosocketinet6sockaddr-in6-redefined-error

While looking at the log produced by Request Tracker (RT) 4.2.12, I noticed there was a warning message about using “localtime” without parentheses. Here’s the actual error message: [warning]: Warning: Use of "localtime" without parentheses is ambiguous at /opt/rt4/sbin/../lib/RT/Interface/Email.pm line 526. The solution which I found from here, fixed the problem: On line 526 of file /opt/rt4/sbin/../lib/RT/Interface/Email.pm, replace: localtime with localtime(). Thanks to the chap who posted the solution.

I use ZFS as a storage driver for docker engine running on my machine. Today after my machine rebooted from a crash, yes Linux system crashes too, I notice that all my docker images and containers disappeared. First thing came to my mind was “did I accidentally destroy docker zfs data set last night?” It’s still there. At that point I suspected that Docker might no longer use ZFS as its data storage....

Sometimes in life, greater is not always better. Here’s a config which I used to make the Gnome 3 title bar smaller. Create a file in ~/.config/gtk-3.0/gtk.css: headerbar.default-decoration { padding-top: 3px; padding-bottom: 3px; min-height: 0px; font-size: 0.7em; } headerbar.default-decoration button.titlebutton { padding: 0px; min-height: 0px; } Here’s how the title bar looks like before and after applying the custom css file: Here’s a smaller title bar: All credits go to the folks from these links:...

FreeBSD 10 comes with a pkgng package manager which allows to install binary packages faster and easier. Unfortunately, there is no binary package available for hack-font for FreeBSD 10. What is hack-font? It’s a very good font which looks very good for source code. Here’s how to install it from source. Check /usr/ports/x11-fonts to see if there is a directory named hack-font. If not, you might need to download or update the ports first....

I upraded puppetserver from 2.4.0 to 2.5.0 on a server running Centos 6.8. Then, puppetserver no longer starts. The log (I think it was puppetsrver-daemon.log) said: As the error reported, /etc/puppetlabs/puppetserver/bootstrap.cfg was not there. The disappearance must have happened during the puppetserver upgrade. I can confirm this by looking at my backup directory and finding the boostrap.cfg file there: /srv/backup/etc/puppetlabs/puppetserver/bootstrap.cfg. According to this issue #1247, the boostrap.cfg file is broken into 2 files and relocated to a different directories....