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14152 discussions

Re: [ILUG-BOM] a secure machine has a root password that doesnt work
by shankar_ramchan＠vsnl.net 22 Oct '02

22 Oct '02

sankha(a)atc.tcs.co.in wrote >Dear Sankha Subhra Som But how do you enforce that (using securetty u can specify secure terminals, [snip] i wud have deleted all entries from /etc/securetty. that wud mean that root wud not be able to log in from any terminal. Assuming that i dont run services that allow root to login remotely, one can use the root account only via the su command. i originally thought that this was what the statement meant. "a secure machine has a boot loader password that doesnt work" also make sense? [snip] Well...i cant think of what this may mean. guess philip was right, the statements seem to be wrong. - Shankar

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Re: [ILUG-BOM] a secure machine has a root password that doesnt work
by shankar_ramchan＠vsnl.net 22 Oct '02

22 Oct '02

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Re: [ILUG-BOM] a secure machine has a root password that doesnt work
by Sankha Subhra Som 22 Oct '02

22 Oct '02

>Dear Sankha Subhra Som >Since in practical situations, the root password is often shared between 2 >or more administrators. Hence to enforce control, root is restricted from >logging in directly to the machine completely. But how do you enforce that (using securetty u can specify secure terminals, but how do you enforce it so that only logins thru su are permitted) And does the statement "a secure machine has a boot loader password that doesnt work" also make sense? Regards Sankha -- SANKHA SUBHRA SOM ATC - BIOINFORMATICS TCS KLK BUILDING. HYDERABAD-1 Ph:(040)6787980-1024 ******************************************************** An anonymous digitoid ******************************************************** I never resist temptation, because I have found that things that are bad for me do not tempt me.

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a secure machine has a root password that doesnt work
by Sankha Subhra Som 22 Oct '02

22 Oct '02

>A *really* secure machine will have a root password that doesn't work Can neone explain the meaning of this to me? Sankha -- SANKHA SUBHRA SOM ATC - BIOINFORMATICS TCS KLK BUILDING. HYDERABAD-1 Ph:(040)6787980-1024 ******************************************************** An anonymous digitoid ******************************************************** I never resist temptation, because I have found that things that are bad for me do not tempt me.

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ISDN TA Configuration on Linux
by dinesh singh 22 Oct '02

22 Oct '02

hi, i am having trouble configuring an ISDN TA (Zyxel -omni.net) on RedHat 7.2. i tried adding an ISDN Device from the redhat network configuration but ZyXEL does not show up in the list of devices there.Is there any way of doing it manually. i would be extremely greatful to anyone who could help me out with this. regards, Dinesh Singh __________________________________________________________ Give your Company an email address like ravi @ ravi-exports.com. Sign up for Rediffmail Pro today! Know more. http://www.rediffmailpro.com/signup/

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Why bash invokes child to execute script.
by Nikhil Karkera 22 Oct '02

22 Oct '02

$ps bash ps If I rum a simple shell script, the bash above, doesn't execute it. It invokes another bash process only for the execution of this script. Why? Regards, Nikhil.

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Linux Cluster
by Charudatt Mulye 22 Oct '02

22 Oct '02

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Re: [ILUG-BOM] need for lex and yacc for Mandrake 9.0
by Vinayak Hegde 22 Oct '02

22 Oct '02

Hi nikhil, Flex and bison have superseded lex and yacc respectively. As flex and bison are compatible with the syntax of lex and yacc, any program written for lex or yacc will run in flex and bison. I did write a small compiler/translator in flex and bison and did not encounter any major differences. So unless you are working on a really big project i don't believe Flex/Bison will make any difference as compared to lex and yacc. --> Vinayak Hegde On Mon, 21 Oct 2002 11:01:47 +0530 "Nikhil D. Kikkeri" wrote: > i use Mandrake 9.0. however for some reason this distro does not provide > with lex, yacc, flex and bison. > > i downloaded flex and bison but it would be better if i get lex and > yacc as Linux Rulez __________________________________________________________________________ http://dating.zeenext.com Log on to nextDATE. It's the next best thing to doing it.

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qmail help needed
by Ashok Iyer 22 Oct '02

22 Oct '02

Hi, I am using qmail as the MTA that serves 200 users. On an average 1500 mails and sent and 1500 received everyday on a 64K leased line. However there is a problem here. Due to insufficient and sometimes intermittent bandwidth, the qmail queue increases a lot especially if a certain mail is huge in size. Due to this, qmail defers delivery of local mails. All qmail processes seem to go to sleep. Though qmail accepts SMTP and POP connections during this time, it fails to deliver mails destined for the local domain. This results in the foll. message when I run 'qmailctl queue' : Messages in queue : 100 Messages in queue but not yet preprocessed: 134 After some time interval of 15 mins or so, suddenly all qmail process awake and the mail delivery begins. I have no problem with delay in outgoing mails but I do not want local mails to be deferred. This is extremely irritating to the users. Can someone tell me the reason for this and the solution? Has someone faced this problem before? -- Ashok __________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/

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Report on Workshop at Fr. CRCE
by Philip S Tellis 21 Oct '02

21 Oct '02

I am posting the report on the Workshop held at Fr. CRCE Bandra on the 12th and 13th of October, 2002. The report was written by Harsh Busa. The same will be put up on the db.ilug-bom.org.in website. Philip 2 Days @ Fr CRCE: Linux Workshop Report on Linux Workshop conducted at Fr. Conceciao Rodrigues College of Engineering, Bandra. Speakers: (all from Ilug-bom) Dr. G. Nagarjuna Mr. Dinesh Shah Mr. Philip S Tellis Mr. Harsh Busa Introduction: In late September, Philip was approached by Professor Shubhangi Deshmukh, of Fr. CRCE, Bandra, to organise a workshop on linux for the students of their college. Further coordination was with Mr. Aliasgar Dahodwala, a final year BE student. After a few discussions with Lug members, four persons volunteered to speak at the workshop. The workshop was to be held across two days, the 12th and 13th of October, 2002. The following schedule was drawn up with reference to topics suggested by the students, speaker expertise, and convenience of the speakers. Day 1, Morning Session: - Basic linux terminal commands - Harsh Busa - Loadable modules in the linux kernel - Philip - C Programming using Autotools - Philip - Short intro to perl - if time - Philip Day 1, Afternoon session: - Kernel compilation - Dinesh - Description of the /proc file system - Philip - Shell programming - Harsh If time permits, add vi and emacs here. Day 2, Morning Session: - Distinction between *nix and non-unix - Nagarjun - Linux File Structure - Nagarjuna or Harsh - File manipulation in Linux - Harsh Afternoon Session: - apache and samba configuration - Dinesh or Nagarjuna - configuring modem/sound/graphics/etc. - Dinesh or Nagarjuna Day 1: The first day started of nearly an hour late as the venue had to be shifted at the last moment from the Seminar Hall to a Classroom. In our opinion, this may have been a blessing as the classroom was smaller, and our voices could reach everyone without much straining. The topics gave speakers a general impression that the participants had some kind of familiarity with linux. We were also informed that the college had recently conducted a linux worshop before it and use it regularly for lab purpose. The opening poll suggested the otherwise. Except for a few final year and third year participants most were new to the concept of linux. This called for a prompt shift in focus, from Advanced Topics down to Creating Literacy and Awareness Harsh started out the first session, trying to touch upon basic filesystem stucture and commands. The session lasted around 90 minutes. Philip took over towards the end, introducing regular expressions using grep. [ed's note: my last regex lecture was 3 hours, this one was 30 minutes. I think they learnt much more this time.] It was decided at this point to postpone, or maybe even omit the concept of modular kernels. After the lunch break the session Shell Scripting was pushed up as it turned out that Philip's presentation on autotools was missing (specifically, the web directory in which the presentation was kept did not have read permissions). Harsh took up basic bash programming covering variables, expressions, conditions and loop structures. This was followed by a few simple examples suggested by members of the audience. Following this Philip took up the topic of AutoTools for writing C programs. We thought that it would be interesting to many, but without the slides, and with few people having been through the configure, make, make install process, it was too abstract for most. Some found it interesting but many seemed to be getting bored. It was already about 4 in the evening so it was time to wind up theory and let people try out some stuff for themselves. The exercise had 4 shell scripts: - Prime Numbers - Calculator - cp/mv/rm with more options / Interactive - Word Filter using grep. The day was dispersed without Dinesh getting to speak about Kernel Compilation and Philip unable to cover /proc, Loadable Kernel modules and Perl. Day 2: The second day started of on a rather positive note it was only 15mins off the schedule. The session was already reorganised by Dr. Nagarjuna looking at the previous day's experince. More time was given to speaking about Why Linux, its roots, the philosophy behind the free software foundation and what distinguishes POSIX ish OS from other OSes. This took around 90-100 mins and then before turning to the lab Dr. Nagarjuna gave a short preamble to EMACS which he then covered more extensively in the labs. It was decided to cut out the File Manipulation topic since people were already using VI and it would leave little time for other topics. Following the post lunch session Dinesh ran through the need for a customised kernel and then spoke about various aspects of selecting components for a custom kernel, various ways of compiling the kernel on shell and X both. Following this Dr. Nagarjuna demonstrated a Debian installation and explained various aspects of its several steps including adding modules to the system with apt-get and then towards the end samba and apache configuration. The speakers took some questions while the installion was going on. By the end of everything people too tired even to ask questions and simply wanted to rush home. Schedule: Finally, the schedule of what actually happened. Day 1, Morning Session: - Linux File Structure - Harsh - Basic linux terminal commands - Harsh Busa - grep - Philip Day 1, Afternoon session: - Shell programming - Harsh - C Programming using Autotools - Philip - Lab Day 2, Morning Session: - Distinction between *nix and non-unix - Nagarjun - Philosphy of Opensource and Free S/W - Nagarjun Afternoon Session: - Kernel compilation - Dinesh - Installing a typical Debian System - Nagarjun - apache and samba configuration - Dinesh or Nagarjuna Endnote: The organisers and the staff, everyone was very hospitable and lunch also quite nice. Though the sessions were interesting but quite randomly laid down topics and the vast spectrum of audience made it very difficult to satisfy everyone. It would have been better if the topics were selected keeping the audience and time in mind. The sessions were too short to do complete justice to the topic yet too long for the audiance to digest everything. It would be better if students internally cover some initial awareness sessions themselves and then have special topics arranged on weekends with a very definite topic in mind. Going by public demand often leads no one anywhere. If so many topics need to be covered well, then they should be spread over several days. or else simply have a separate beginner's workshop and then an advanced system admin or programming.

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