SSHFS (Secure SHell FileSystem) is a file system for GNU/Linux, BSD and other UNIX like OS that allows you to mount a remote directory in userspace (filesystem userspace) making use of FUSE and ssh. Once you mounted the remote directory you can do any operation over it as if it were a local DIR.
Mount remote directory using SSHFS Read More »
mod_deflate is a module for Apache which compresses the content of each http request before sending it to the client decreasing the page load time for each request.
Proceed as follows to enable gzip compression
Enable gzip compression on Apache HTTP Read More »
When you install Apache HTTP on CentOS, mod_filter is not enabled by default then if you try to use some of its directives an error like this is raised: "Invalid command 'FilterDeclare', perhaps misspelled or defined by a module not included in the server configuration", so to resolve the above error is enough to add the following line to the httpd.conf.
Activate mod_filter in Apache on CentOS Read More »
I have installed the basic packages of the XFCE desktop, by typing:
$ sudo apt-get install xfce4The above command installs some packages that I do not use as: Orage so I typed:
$ sudo apt-get purge orage
...
The following packages will be REMOVED:
orage* xfce4*
...
Do you want to continue[Y/n]? y
P. Now every time I try to install an application apt-get show a message that there are packages that were installed automatically, and which are not required but they are essential packages to keep my desktop running correctly. How to resolve this?
R. You must change the state of those packages from automatic installation to manual installation by typing:
$ sudo apt-mark manual paquete1 paquete2 ...– man apt-mark
Change the state of package from automatic to manual Read More »
To format XML files usually I use option 3 described in How to pretty print XML on GNU/Linux but recently I've needed to work with XML files which in addition to being obfuscated one part of it use html entities.
Formatting XML using Python or PHP Read More »
The obfuscated XML files are difficult to read because the content of the file occupies a single line. Today LibreByte offers 3 tools that allow you to format an XML file.
Tool 1: web browser, examples: Mozilla firefox, Google Chrome. The disadvantage of using a browser is that you can not edit the XML file, only useful if you if you want to view it and nothing more.
Tool 2: use xml_pp, xml_pp is part of the XML-Twig suite, to install it on Debian GNU/Linux type:
$ sudo apt-get install xml-twig-tools
You can then format the XML file by typing:
$ xml_pp -i mifichero.xml
If you want to save the formatted content in another file, type:
$ xml_pp mifichero.xml > mifichero_pp.xml
If you want to edit the formatted file, you can use any text editor.
Tool 3: Use Geany editor and prettyprinter plugin, to install it on Debian GNU/Linux type:
$ sudo apt-get install geany geany-plugin-prettyprinter
After running the above command, you must perform the following steps to activate the plugin
1. Run Geany
XFCE:
Menu-> Development-> Geany
From the console, you can also type:
$ geany &
2. Find the Menu
Tools -> Plugin Manager
3. Activate the plugin XML PrettyPrinter
Once the plugin is activated, the option to format XML appears in the Menu:
Tools-> PrettyPtrinter XML
– man xml_pp
– Geany Project
– XML-Twig
– Geany un IDE ligero
How to pretty print XML on GNU/Linux Read More »
With the release of version 5.3.0, PHP development team incorporated what are called anonymous functions or closure.
An anonymous function, as its name implies, is nothing more than a function that has no name and that can be used as a callback allowing greater elegance and readability of source code, it is also possible to assign an anonymous function to a variable as were another data PHP type. PHP internally converts this variable in an instance of the Closure class.
Anonymous functions in PHP Read More »
Some DVD player do not support video in high definition resolution then it is necessary to convert it to a supported format, so
* Look for your DVD player specifications
* Look at the details of the video file that you want to convert using MediaInfo
* Use a video conversion tool, in this case we will use avconv which is part of the Libav suite
The following example assumes that your DVD supports:
* Video mpeg4 simple profile format,
* mp3 audio format
* 720 frame size (width) by 576 (high).
$ sudo apt-get install libav-tools libmp3lame0
$ avconv -i fichero-origen -f avi -vtag divx -c:v mpeg4 -c:a libmp3lame -s:v 720x576 -aspect 16x9 -qscale 3 fichero-destino
where:
-f, the destination file format, usually avconv guess the format from the extension of the destination file
-vtag, specifies that we will use fourcc divx video codec to mpeg4 (Simple Profile)
-c:v, video code that will be used during the conversion
-c:a, code of audio that we will use during the conversion
-s:v, the frame size
-aspect, aspect and ratio that will have the resulting file. Is recommended to be the same as the original file to achieve good picture quality
-qscale, value between 1-31. A value of 1 means that the resulting file will have the same quality as the original file
– man avconv
Convert video file to watch on a DVD player Read More »
If when you try to unpack a file .tar.bz2, you get the following error messages:
tar (child): bzip2: Cannot exec: No such file or directory tar (child): Error is not recoverable: exiting now tar: Child returned status 2
You must solve it by installing the bzip2 package
# apt-get -y install bzip2
– man tar
Failed to decompress file .tar.bz2 Read More »
To copy a range of lines from a file to another:
1. Open the file in VIM
$ vim fich
2. Execute the following command within the editor (press Esc while in insert mode)
:num-sup-line,num-inf-linew! file-name
Example:
:10,50w! file-name
Further reading
– help write
Copy a range of lines from a file to another Read More »