how to convert .txt files to ReST in linux - linux

In Documentation of linux kernel tree I need to convert .txt files to ReST. Is it like simply renaming the extension like .rst?

Having had a cursory glance over a few files in the documentation directory of the kernel source tree I'd say nothing needs doing, they seem to be in rst markup; the extensions don't matter in Linux.

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In Linux system file extensions as capital and small lettters

While using linux system I encounter that that many file extensions are in capital as well as small letters like
myfile.JPG and myfile.jpg
I know Linux file system is case sensitive, but what's the difference in these two files? and why sometimes they get saved saved as capital or sometimes in small.
I have seen the same for other file too like
.ttf vs .TTF
Thanks
There is no difference if you name the file myfile.jpg or myfile.JPG or myfile.jpeg. Linux doesn't care.
The extension might be used by some programs running on linux and by humans to easily identify the filetype but it doen't affects the file in any way. You can even call it myfile.dog or just leave it without extension and would be the same image file and for linux it wouldn't make any difference.
If you have an image file and you want to tell what kind of image file it is you can use the file command or if you have imagemagick installed you can use the identify command.
Try renaming some jpeg file and give it a png extension, the run file image.png, you will see that it still is a jpeg file and that the png extension is there only to confuse you.
You might find this usefull: https://www.quora.com/How-do-Linux-identify-file-types-without-extensions-And-why-cant-Windows-do-so

Linux file utility magic.mgc database get content

I write project where I need to identify certain file formats.
For some formats I have found signatures that I use for identifying easily (mp3, ogg), with another formats I have a big problem (like MPEG ADTS) - I just cannot find what kind of signature can be used for it.
I found out that File utility for Linux environment can do it.
I tried to search it in source code, but I've found nothing.
I found that file utility holds its database in magic.mgc file. But it's hold in binary form.
It looks like:
Does someone perhaps know how to find that database in plain text format?
That utility isn't a Linux-specific utility; it's the version of the UN*X file command originally written by Ian Darwin. The binary .mgc file is generated from a bunch of source files.
Your Linux distribution probably has a source code package for it; where you get that package, and how you install it, depends on which distribution you're using.
The source files from which the .mgc file was generated might also be available on your distribution without installing the source package for file; if so, you could use the file command to generate it, using the -C flag. I don't see them anywhere obvious on my Ubuntu 12.04 virtual machine, so that might require some other package to be installed (file itself is installed). (On OS X, they're in the directory /usr/share/file/magic.)
Alternatively, you could download the standard version of that file (which might have been modified by your distribution, so you might not want that version) and modify and build it.
Note that, on some versions of UN*X systems, the bulk of the work done by the file command is done in library routines in the "libmagic" library; see whether your distribution has that or can install it (try, for example, man libmagic) and whether it can do the job for you.

Is it possible to render .doc file in qt on linux?

All I need is to show .doc files in qt application on Linux. No need edit/save or something else.
Is it possible?
Of course it's possible. But the file reading, parsing, and displaying would really be carried out by the underlying language, not Qt. So, if you think about it, C++ and Python and whatever else is quite capable of parsing and displaying what is essentially a text file (or for .dox an XML file).
The implementation details of how to go about that are quite another matter. You have to contend with a huge portion of the file that is merely there to render the file's styling, etc.

make swf from fla without ever opening it

is it possible to change text and images in a fla file without ever opening it up and then making the swf via command line? I want to make a flash template and save the fla. Then be able to update my text and image name and convert it to swf. I have one template but tons of different text options and background images. It would be nice to be able to copy the master.fla twenty times and just change the source code (will do this from command line) and then convert to swf (via command line).
Any help would be appreciated.
With CS5, you can do half of what you're asking today, by using the XFL file format instead of FLA. Instead of a binary blob, you get an editable XML file and a tree of separate asset files: PNGs, AS3 files, etc. You can then modify the XML or AS3 files programmatically to get your variants.
(A CS5 FLA file is really just a zipped up version of the XFL, but there's no advantage to using that instead of an XFL. In CS4 and previous, FLA was a proprietary binary format.)
The missing piece is an XFL compiler. Adobe currently provides no such thing, and the third party market hasn't yet produced one.
You could use a systems automation tool to drive the Flash Professional environment through the compilation steps. On OS X, for example, either Automator or AppleScript should be able to do what you want. It'll just have more overhead than the command line compiler you were hoping for.
I agree with Jason, there are a lot of alternatives to what you suggest. Keeping content out of the SWF is good practice actually. This is a good way to avoid large files!
Depending on what you 're looking to achieve, there are a lot of solutions available. XML is an option, JSON another.
If you're looking to build a template, any of the above would seem appropriate.
It sounds like you're working from the Flash IDE, as Jason suggests you may want to have a look at another IDE, such as FlashDevelop, FDT or FlashBuilder as they make coding with AS3 a lot easier.

Creating customized .dmg files upon download

I want to distribute a cross-platform application for which the executable file is slightly different, depending on the user who downloaded it. This is done by having a placeholder string somewhere in the executable that is replaced with something user-specific upon download.
The webserver that has to do these string replacements is a Linux machine. For Windows, the executable is not compressed in the installer .exe, so the string replacement is easy.
For uncompressed Mac OS X .dmg files, this is also easy. However, .dmg files that are compressed with either gzip or bzip2 are not so easy. For example, in the latter case, the compressed .dmg is not one big bzip2-compressed disk image, but instead consists of a few different bzip2-compressed parts (with different block sizes) and a plist suffix. Also, decompressing and recompressing the different parts with bzip2 does not result in the original data, so I'm guessing Apple uses some different parameters to bzip2 than the command-line tool.
Is there a way to generate a compressed .dmg from an uncompressed one on Linux (which does not have hdiutil)? Or maybe another suggestion for creating customized applications without pregenerating them? It should work without any input by the user.
I realize that I'm a bit too late here, but we wanted to do exactly the same thing and got it to work using libdmg. https://github.com/planetbeing/libdmg-hfsplus
Basically, you can use libdmg to unpack a dmg file to an uncompressed file containing a hfs+ file system, play around with the files inside the hfs+ file system, and them put it back together again as a dmg file with the correct checksums.
If you use any fancy dmg features, like showing an EULA before the image is mounted, then these will not survive the process. Background images and so on work, though.
If your web server and client support the gzip encoding, then you can deal with uncompressed files on the server, but have them compressed / decompressed on the fly by the web server / web client respectively.
e.g. apache's mod_gzip.
Otherwise maybe you can split your dmg into 3 parts:
the stuff before what you want to replace
the string you want to replace
the stuff after what you want to replace
If the gzip stream is splittable at those points, you could just concatenate the front and back onto the gzipped string you want to replace. That would let you generate it on the fly.
Release a normal, read-only, compressed dmg. Then bundle your app in a package installer with a pre-flight script that sets the variables you need.

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