Web Archives - Page 3 of 7

QA

VirtualBox report “Kernel driver not installed” on Fedora 21

ByEric Ma Mar 24, 2018Jul 25, 2020

VitualBox is installed on Fedora 21 by # yum install VirtualBox The following packages are installed kmod-VirtualBox-3.18.7-200.fc21.x86_64-4.3.20-4.fc21.4.x86_64 VirtualBox-4.3.20-3.fc21.x86_64 There is the kernel modules package installed. However, when running virtualbox (after reboot), it reports: [zma@laptop:~]$ virtualbox WARNING: The vboxdrv kernel module is not loaded. Either there is no module available for the current kernel (3.18.7-200.fc21.x86_64) or…

QA

Any good Web browser in command line in Linux?

ByEric Ma Mar 24, 2018Oct 7, 2019

What suggested web browser in command line? This will be very useful for browsing the Internet from a command line via SSH. You may use Lynx, a fully-featured World Wide Web (WWW) client for users running cursor-addressable, character-cell display devices, in Linux. Homepage: http://lynx.isc.org/ Lynx is a fully-featured World Wide Web (WWW) client for users…

QA

How to automatically post blog RSS feed to Google plus pages?

ByEric Ma Mar 24, 2018Oct 7, 2019

I have a blog with RSS feeds. Feeding to twitter and facebook is supported by many tools. But for the Google plus page, it seems not straightforward. How to automatically post blog RSS feed to Google plus pages? You can use Hootsuite to post blogs through RSS feeds to your Google plus pages. First, register…

QA

How to get a free Web server SSL/TLS certificates for my websites?

ByEric Ma Mar 24, 2018Feb 28, 2020

Can I get a non-self-assigned and free Web server SSL/TLS certificates for my https websites? Asking the users to accept the self-assigned SSL certificates for my websites is not very convenient. Please check https://letsencrypt.org/ . PS: StartSSL used to provide 1 year free SSL. But StartCom CA is closed since Jan. 1st, 2018.

QA

How to fix “Your profile could not be opened correctly.” on Linux?

ByEric Ma Mar 24, 2018Oct 7, 2019

I experience the program on Linux (Fedora 12) that Chrome reports “Your profile could not be opened correctly.” as follows. How to fix it? Restarting Chrome would not help. Removing the ‘Web Data’ directories from all profiles works for me (Making backup first as the commands will remove your files): cd ~/.config/google-chrome find ./ -name…

QA

How to filter RSS feed items?

ByEric Ma Mar 24, 2018Feb 20, 2019

How to filter RSS items and leave only certain items that I want? Rules may be like: satisfies all or any rules { contains keyword; does not contain keyword } or etc. Two sServices that I find working well for me: Yahoo Piples: https://pipes.yahoo.com/pipes/</s> Pipes is a powerful composition tool to aggregate, manipulate, and mashup…

QA

How to remove AdSense ads for mobile devices while keep them for desktops?

ByEric Ma Mar 24, 2018Mar 24, 2018

I want to add adsense ads to be shown to visitors on desktop only. How to remove AdSense ads for mobile devices? You can achieve this through using “Responsive ad unit” of AdSense. The support article Create a responsive ad unit from AdSense discusses this and gives an example. Check the “Hiding an ad unit”…

QA

How to download a rtmp stream on Linux?

ByEric Ma Mar 24, 2018Mar 24, 2018

How to download a rtmp video stream on Linux? You can use mplayer to dump the rtmp stream like: mplayer -dumpstream rtmp://example.com/path/to/stream.mp4 It will generate ./stream.dump and you can rename it to the file with the extension you need like stream.mp4. The rtmp link usually can be found from the HTML or JavaScript source code…

QA

How to back up emails from the email server?

ByEric Ma Mar 24, 2018Feb 26, 2019

offlineimap actually does “synchronization”—if an email is deleted from the server, the email will be deleted from the local Maildir (http://offlineimap.org). This is good for mail sync. However, for backing up emails,one would like to keep the email even if it is deleted from the server. How to achieve this? You may use `getmail` which…

QA

How to redirect HTTP to HTTPS in Apache with mod_rewrite?

ByEric Ma Mar 24, 2018Mar 24, 2018

I’d like to force using of https on one of my site. How to redirect HTTP to HTTPS in Apache with mod_rewrite? You can put these lines to the .htaccess file in the directory from which you would like to redirect HTTPS to HTTP: RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

QA

How to download a youtube video to my computer?

ByEric Ma Mar 24, 2018Mar 24, 2018

How to download a youtube video to my computer? You may use the ClipConverter.cc for downloading Youtube videos: http://www.clipconverter.cc/ How to download a YouTube video: Paste your YouTube URL at ‘Media URL’ and press Continue. Select the format and the options for the conversion. The default options are for most videos a good setting. Press…

QA

Video player for iPhone for uploading video files and watching them

ByEric Ma Mar 24, 2018Mar 24, 2018

Which video player for iPhone is good for uploading video files from my computer and watching them? For example, I download some video files and would like to watch them on my iPhone on the go. I know iTune can do this. But I am on Linux and I want something easier. Many apps can…

QA

How to mark a line as deleted in BBCode?

ByEric Ma Mar 24, 2018Mar 24, 2018

How to mark a line as deleted in BBCode? e.g. a line crossing through the text. You can use the [s] tag. The BBCode: [s]strikethrough text[/s] will be converted <s>strikethrough text</s>, <del>strikethrough text</del> or <span style=”text-decoration: line-through;”>strikethrough text</span> Check more at: http://en.wikipedia.org/wiki/BBCode

QA

Add my own window.onload safely without overwriting old ones

ByEric Ma Mar 24, 2018Mar 24, 2018

My webpage has one existing window.onload javascript function defined by a javascript plugin in the <head> section. Now, I defined a new one and add it to the end of the HTML page: <script type=”text/javascript”> window.onload = function () { // great work here } </script> I find the new one overwrites the old one…

QA

Running Chrome over SSH tunnel

ByEric Ma Mar 24, 2018Mar 24, 2018

How to run Chrome on remote host over a SSH tunnel? This way, I can access resource that can only be accessed inside the remote host’s network. Running Chrome over a SSH tunnel is much easier than running Firefox over SSH from a Linux host: First, ssh to the remote host with -X option: ssh…

QA

How to play .swf files on Linux?

ByEric Ma Mar 24, 2018Mar 24, 2018

How to play the flash (.swf) files downloaded from the Web on Linux? The best solution that I find to play .swf files on Linux is run Adobe Flash Player Projector (download from here, a single .EXE file) and run it under wine.

QA

How to flush a cached redirect by Chrome?

ByEric Ma Mar 24, 2018Mar 24, 2018

Chrome caches redirects. How to flush a cached redirect by Chrome? Clearing the cache/cookies for the specific domain (sorry, it is the domain level in this solution) as in https://www.systutorials.com/qa/453/how-to-remove-cookies-for-a-certain-site-in-chrome will also flush the redirect caches for this domain.

QA

How to allow pre tag in WordPress comments?

ByEric Ma Mar 24, 2018Mar 24, 2018

How to allow pre tag in WordPress comments? You can add a filter hook for pre_comment_approved: <?php function filter_handler( $approved , $commentdata ) { // inspect $commentdata to determine approval, disapproval, or spam status return $approved; } add_filter( ‘pre_comment_approved’ , ‘filter_handler’ , ’99’, 2 ); ?> Reference: https://codex.wordpress.org/Plugin_API/Filter_Reference/pre_comment_approved

QA

How to fetch a webpage as a mobile browser with curl on Linux?

ByEric Ma Mar 24, 2018Mar 24, 2018

On Linux, how to download a webpage as a mobile browser? You can change the agent of curl to be a mobile browser’s and the remote webserver may be consider the request from a mobile browser: curl -A “Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_3 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) CriOS/28.0.1500.12 Mobile/10B329 Safari/8536.25″…

QA

How to aggregate multiple RSS feeds to a single one?

ByEric Ma Mar 24, 2018Jun 26, 2018

How to aggregate multiple RSS feeds to a single one? If you want a program to construct a web service by your own, SimplePie may be a good choice. It is written in PHP. If you just want a tool to make work done, I suggest Yahoo Pipes which works really well for me. (Yahoo…