Linuxers June 2001

linuxers@mm.ilug-bom.org.in

91 participants
164 discussions

Re: Re: [ILUG-BOM] Compressed files
by Nikhil Karkera 29 Jun '01

29 Jun '01

------------- Original Message -------------- Aseem <aseem(a)ports.cmc.net.in> wrote: On Fri, 29 Jun 2001, N. Shrikant wrote: > Are *.gz files really compressed into smaller sizes? try yourself. on linux note the file size before compression. and then then compress it with gzip, bzip2, winzip. and you will find that all these utilities do compress the files. compression you get depends on file format. i found that gzip compresses more for text files while bzip2 was good for binary file compression. i found both gzip and bzip2 better than winzip when it comes to maximum amount of compression. ---------------------- End --------------- Yep, you are right, compression results do depend on the file format. Compression basically reduces redundancies in data. Some file formats are already in compressed form. Like JPEG, MP3 etc. An MP3 file is just a compressed WAV file. So compressing these file formats won't give you very high compression ratio, since most of the redundancies have already been eliminated. Try saving a (fairly large) BMP as a JPEG file. Notice the reduction in size, which is a result of compression. If, interested in compression techniques, you'll find loads of reading material on the Net. If you know someone from the engineering fraternity, try getting hold of books like 'Computer Networks' by Tanenbaum, or 'Principles of Comm. Systems' by Taub & Schilling. Look for Information Theory in the latter. These are the books I came accross. There are many more. Regards, Nikhil. ____________________________________________________ Buy Feng Shui Package for Rs. 151/- only, at http://shopping.rediff.com/shopping/fengshui_mailer.htm

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Re: Re: [ILUG-BOM] Compressed files
by Nikhil Karkera 29 Jun '01

29 Jun '01

------------- Original Message -------------- Aseem <aseem(a)ports.cmc.net.in> wrote: On Fri, 29 Jun 2001, N. Shrikant wrote: > Are *.gz files really compressed into smaller sizes? try yourself. on linux note the file size before compression. and then then compress it with gzip, bzip2, winzip. and you will find that all these utilities do compress the files. compression you get depends on file format. i found that gzip compresses more for text files while bzip2 was good for binary file compression. i found both gzip and bzip2 better than winzip when it comes to maximum amount of compression. -------------------- End ------------------ Yep, you are right, compression results depend on the file format. Compression basically reduces redundancies in data. Some file formats are already in compressed form. Like JPEG, MP3 etc. An MP3 file is just a compressed WAV file. So compressing these file formats won't give you very high compression ratio, since most of the redundancies have already been eliminated. Try saving a (fairly large) BMP as a JPEG file. Notice the reduction in size, which is a result of compression. If, interested in compression techniques, you'll find loads of reading material on the Net. If you know someone from the engineering fraternity, try getting hold of books like 'Computer Networks' by Tanenbaum, or 'Principles of Comm. Systems' by Taub & Schilling. Look for Information Theory in the latter. These are the books I came accross. There are many more. Regards, Nikhil. ____________________________________________________ Buy Feng Shui Package for Rs. 151/- only, at http://shopping.rediff.com/shopping/fengshui_mailer.htm

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Re: Re: [ILUG-BOM] Compressed files
by Nikhil Karkera 29 Jun '01

29 Jun '01

------------- Original Message -------------- Aseem <aseem(a)ports.cmc.net.in> wrote: On Fri, 29 Jun 2001, N. Shrikant wrote: > Are *.gz files really compressed into smaller sizes? try yourself. on linux note the file size before compression. and then then compress it with gzip, bzip2, winzip. and you will find that all these utilities do compress the files. compression you get depends on file format. i found that gzip compresses more for text files while bzip2 was good for binary file compression. i found both gzip and bzip2 better than winzip when it comes to maximum amount of compression. -------------------- End ------------------ Yep, you are right, compression results depend on the file format. Compression basically reduces redundancies in data. Some file formats are already in compressed form. Like JPEG, MP3 etc. An MP3 file is just a compressed WAV file. So compressing these file formats won't give you very high compression ratio, since most of the redundancies have already been eliminated. Try saving a (fairly large) BMP as a JPEG file. Notice the reduction in size, which is a result of compression. If, interested in compression techniques, you'll find loads of reading material on the Net. If you know someone from the engineering fraternity, try getting hold of books like 'Computer Networks' by Tanenbaum, or 'Principles of Comm. Systems' by Taub & Schilling. Look for Information Theory in the latter. These are the books I came accross. There are many more. Regards, Nikhil. ____________________________________________________ Buy Feng Shui Package for Rs. 151/- only, at http://shopping.rediff.com/shopping/fengshui_mailer.htm

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Re: Re: [ILUG-BOM] Compressed files
by Nikhil Karkera 29 Jun '01

29 Jun '01

------------- Original Message -------------- Aseem <aseem(a)ports.cmc.net.in> wrote: On Fri, 29 Jun 2001, N. Shrikant wrote: > Are *.gz files really compressed into smaller sizes? try yourself. on linux note the file size before compression. and then then compress it with gzip, bzip2, winzip. and you will find that all these utilities do compress the files. compression you get depends on file format. i found that gzip compresses more for text files while bzip2 was good for binary file compression. i found both gzip and bzip2 better than winzip when it comes to maximum amount of compression. -------------------- End ------------------ Yep, you are right, compression results depend on the file format. Compression basically reduces redundancies in data. Some file formats are already in compressed form. Like JPEG, MP3 etc. An MP3 file is just a compressed WAV file. So compressing these file formats won't give you very high compression ratio, since most of the redundancies have already been eliminated. Try saving a (fairly large) BMP as a JPEG file. Notice the reduction in size, which is a result of compression. If, interested in compression techniques, you'll find loads of reading material on the Net. If you know someone from the engineering fraternity, try getting hold of books like 'Computer Networks' by Tanenbaum, or 'Principles of Comm. Systems' by Taub & Schilling. Look for Information Theory in the latter. These are the books I came accross. There are many more. Regards, Nikhil. ____________________________________________________ Buy Feng Shui Package for Rs. 151/- only, at http://shopping.rediff.com/shopping/fengshui_mailer.htm

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x win problems
by Ulhas Vaidya 29 Jun '01

29 Jun '01

hi all, there is an observation with regards to KDE manager (i am not sure if others behave similarly). if you put the machine in screen saver mode (password protected ) and press ctl+alt+bs then xwin gets killed (actually it should not because autherization is not confirmed) and gives open access to the account! (even if it was logging the user out it would have been fine). is there anyway to stop this? ulhas

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Re: [ILUG-BOM] Re: Rediffmail line length.
by Nikhil Karkera 29 Jun '01

29 Jun '01

------------- Original Message -------------- Philip S Tellis <philip.tellis(a)iname.com> wrote: Your line length's too long man. ------------------ End ---------------------- I thought I'd include this in my previous mail, but didn't. Should have. I wrote to Rediffmail about fixing the line length to about 72, or providing an option to do so in the preferences. The first time 'round they misunderstood "length" for *size* of the mail. I wrote again, making things very clear. That mail got no reply, and its been almost a month now, so I'm guessing they don't want to reply. I know there's atleast one person on this list who's from Rediff. Can he do something? Mr. RM? Anyway, till then, I'm going to be doing it manually. Carriage returns :) Regards, Nikhil. ____________________________________________________ Buy Feng Shui Package for Rs. 151/- only, at http://shopping.rediff.com/shopping/fengshui_mailer.htm

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solaris 8
by liloindia 29 Jun '01

29 Jun '01

Dear Linuxers, I have recently burnt cds for solaris.... has anybody used solaris 8 (intel)... i am facing problems in installatio can somebody provide me a link to some docs on installation of solaris 8. regards lilo ____________________________________________________________ Do You Yahoo!? For regular News updates go to http://in.news.yahoo.com

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Compressed files
by N. Shrikant 29 Jun '01

29 Jun '01

Are *.gz files really compressed into smaller sizes? Because when I open a gzipped file using WinZip, the compression ratio always reads 0%, and after extracting the conctents of a gzipped file and adding up the file sizes, it totals the size of the *.gz file. So where's the compression? Also, which one can give the maximum compression, gzip or bzip? - Shrikant p.s:- is it my imagination, or are duels getting rather prolix?

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Kernel Compiling
by noel seq 29 Jun '01

29 Jun '01

Hi, Thanx guys, for all the support and encouragement. I had another linux installation at home and tried compiling it at home with a new kernel 2.4.4, which i dowloaded from kernel.org I managed compiling it and also booting into it. However before i got too excited, i found that i set my eth0 wrong. I tried to linuxconf and netconf and both gave me pipe broken error. Do i have to recompile and if i do what do i have to take care? About the upmteen problems that i faced in my office installation I think i will reinstall RHL 6.2 once again and then try to compile to the new version. The basic problem I had was gcc/cc was not installed and therefore i could not compile. Will try installing an older version of gcc. Noel. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

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unable to make menuconfig
by noel seq 29 Jun '01

29 Jun '01

Hi Luggers, It all started after I started to upgrade my kernel from 2.2 to 2.4.2 as philip suggested, i untarred the 2.4.1 kernel but was unable to add the patch. While applying the 2.4.2 patch, it gave me an error : patch unexpectedly ends in middle of line unexpected end of line in patch. I continued to make menuconfig. and got the following error: rm -f include/asm ( cd include ; ln -sf asm-i386 asm) make -C scripts/lxdialog all make[1]: Entering directory `/usr/src/linux-2.4.1/scripts/lxdialog' >>Unable to find the Ncurses libraries. >> >>You must have Ncurses installed in order >>to use 'make menuconfig' make[1]: Leaving directory `/usr/src/linux-2.4.1/scripts/lxdialog' i already have it installed. i.e ncurses3-1.9.9e-11.i386.rpm and ncurses-5.0-11.i386.rpm Then i downloaded gcc-2.96-54 which gave me an rpm error saying major numbers <=3 are supported. So i am upgrading rpm to 4.0.1-0.6x and it is giving me an error failed dependencies libdb-3.1.so is meeded. Am i going in circles. Is there a simpler way. Please advise. Noel _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

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Linuxers June 2001