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• CentOS: How to prevent a user from executing an application installed in a specific directory

  - by slayernoah

  I have an application installed in /etc/mydir. I have executed the following to remove the ability for users to execute this program. chown root:group1 /etc/mydir -R chmod 700 /etc/mydir -R I created a new user and logged in as this user. The new user was not added to group1 However, I was able to execute this program by just typing the program name. How can I stop users being able to run this using chmod and chown. Please let me know. PS. the new users cannot cd into /etc/mydir but they can still execute using the program name.

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• How to calibrate ASUS k52f battery on Ubuntu?

  - by cutalion

  I'm not sure if the problem is in software or my battery is dying, I'll move my question to another forum if it's not a SO question I have a problem with the battery on my laptop - ASUS K52F. It shows incorrect information about capacity. When I unplug the charger it can work some time, but then it will power off without any warnings. Sometimes it will power off right after I unplug the charger. Here is some info I could get: > uname -a Linux alligator 3.5.0-18-generic #29-Ubuntu SMP Fri Oct 19 10:26:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux > acpi -i Battery 0: Charging, 99%, 18:25:15 until charged Battery 0: design capacity 5235 mAh, last full capacity 69964 mAh = 100% > cat /sys/class/power_supply/BAT0/uevent POWER_SUPPLY_NAME=BAT0 POWER_SUPPLY_STATUS=Charging POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_CYCLE_COUNT=0 POWER_SUPPLY_VOLTAGE_MIN_DESIGN=10800000 POWER_SUPPLY_VOLTAGE_NOW=9246000 POWER_SUPPLY_POWER_NOW=176000 POWER_SUPPLY_ENERGY_FULL_DESIGN=**48400000** POWER_SUPPLY_ENERGY_FULL=**646822000** POWER_SUPPLY_ENERGY_NOW=**643588000** POWER_SUPPLY_MODEL_NAME=K52F-44 POWER_SUPPLY_MANUFACTURER=ASUSTek POWER_SUPPLY_SERIAL_NUMBER= I noticed, that POWER_SUPPLY_ENERGY_NOW and POWER_SUPPLY_ENERGY_FULL are greater than POWER_SUPPLY_ENERGY_FULL_DESIGN. I don't think it's ok :) I can run any additional commands.

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• My bios datetime is resetting to 2002, what should I do?

  - by Thierry Lam

  I bought my PC brand new in mid-2006. I'm currently dual booting Win XP 32 bits and Ubuntu Karmic Desktop. Over the last few days, when I boot up my computer, it tells me that my bios time is not set. I now have 2 choices for booting in: Windows first: I can safely get into Windows but the date now shows 2002/01/01 at 00:00. From there, Windows will not sync its time to its servers, I have to manually advance the date myself. I can also advance the date from the bios at startup. Ubuntu first: Since the time date is still set at 2002, the boot system cannot find my linux partition. I can fix that issue by booting to Windows, set the date properly and the linux issue will be fixed automatically. The above two issues can also be fixed if I manually set the bios date/time manually when I turn on my computer. It's annoying to do that every single day since I shut down my PC daily. Am I having an OS issue or a hardware issue? How can I resolve this problem?

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• How to set up virtual users in vsftpd?

  - by ares94

  I've read this tutorial: http://howto.gumph.org/content/setup-virtual-users-and-directories-in-vsftpd/ My configuration is as follow: ---vsftpd.conf--- listen=YES anonymous_enable=NO local_enable=YES virtual_use_local_privs=YES write_enable=YES connect_from_port_20=YES pam_service_name=vsftpd guest_enable=YES user_sub_token=$USER local_root=/var/www/sites/$USER chroot_local_user=YES hide_ids=YES ---/etc/pam.d/vsftpd--- auth required pam_pwdfile.so pwdfile /etc/vsftpd/passwd account required pam_permit.so I created file /etc/vsftpd/passwd and added users using htaccess. I tried to login but it didn't work: ftp 127.0.0.1 Connected to 127.0.0.1 (127.0.0.1). 220 vsFTPd 2.3.5+ (ext.1) ready... Name (127.0.0.1:root): user1 331 Please specify the password. Password: 530 Permission denied. Login failed. Everything seems fine accept the permission denied thing. How can I fix this?

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• Should VMs run Windows Update and firewall/anti-virus software?

  - by John

  I just got XP mode running under Windows7 VirtualPC. Should I bother playing with the XP security settings or is it not needed? I would except the VM should be isolated, but then it has access to my main system's drives which doesn't sound very secure.

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• Update in grub.cfg file for loading new kernel image in Ubuntu 11.04

  - by user1627657

  I am new to Linux. I am compiling Linux kernel (ver: 2.6.34.12) in gcc in traditional manner in VMware machine in Ubuntu (kernel version - 2.6.38-8-generic) 11.04 version. I am unable to find, where to update about newly compiled kernel in the grub.cfg file. I updated the newly created image version name in the existing image. Then VMware didn't able to load new kernel. I have searched in internet but I didn't find. So anyone can help me, to update in the grub.cfg and to successfully load new kernel. Few things about what I have done: Make bzImage to create image file. Make modules_install && make install to install modules and then sudo mkinitramfs -o initramfs.img-2.6.34 2.6.34. Then sudo gedit grub.cfg. In that at the mementry I updated the version of vmlinuz and initrd from 2.6.38-8 to 2.6.34.12. This is I have done.

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• Very Slow DSL (ethernet) speed [New Interesting Update]

  - by Abhijit

  Very IMPORTANT and INTERESTING UPDATE: Due to some reason I just thought to do a complete new setup and this time I decided to again have openSUSE plus ubuntu. So I first reinstall lubuntu and then I installed OpenSUSE 12.2 (64 bit). Now, my DSL speed is working very normal and fine on opensuse. So this is very scary. Is it possible for any operating system to manipulate my NIC so that it will work fine only on that operating system and not on another os? Regarding positive thinking and not being paranoid, what is it that makes ONLY suse to get my NIC to work at normal speed but ubuntu can not do it? Not even fedora? Not even linux mint? What all these OS are lacking that enables suse to work great? == ORIGINAL QUESTION == I 'was' on opensuse 12.2 when my dsl speed was normal. Yesterday I switched from opensuse to ubuntu 12.04 and speed decreased. It came to range of 7-10-13-20-25-kbps. Then I switch to linux mint, and then to fedora. Still slow speed. When I was in ubuntu I disabled ipv6 but still no luck. Now I am in fedora but this time with DIFFERENT ISP. And still I am getting very slow sped. So my guess is this is nothing to do with os. What can be wrong? Is this problem of NIC? Does NIC speed decreases over time? Does NIC life ends over time as with keyboard or mouse? Help please All the os I used are 64 bit and my laptop is Compaq Presario A965Tu Intel Centrino DUal Core. Interesting thing to notice is I get normal speed while downloading torrent inside torrent client softwares. This slow speed issue applied to download from any web browser or installing software using terminal.

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• Forgotten LUKS passphrase

  - by Ansh David

  i am stuck with a big problem. I have encrypted my linux drive with LUKS and now I can't remember it. During boot, it prompts me for the passphrase, but I went into troubleshooting mode and deleted the entry from /etc/crypttab so at least I can boot now into my account but that doesn't solve the problem. I can't access my drive /dev/sda5. Can someone please show me a way to crack the passphrase or is there no way around it.

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• Upstart: accept user input to switch xorg.conf

  - by Utaal

  Hi all! I'm trying to get a startup script requiring user input running before gdm starts (the script should allow me to choose from a list of xorg.conf's the one I'd like to use for the current session). Already tried creating a pregdm.conf in /etc/init, containing: start on filesystem stop on runlevels [06] # ... console output script # script that uses read to gather user input and replaces xorg.conf with the selected one end script and changing start on in /etc/init/gdm.conf to: start on (filesystem and started dbus and started pregdm and (drm-device-added card0 PRIMARY_DEVICE_FOR_DISPLAY=1 or stopped udevtrigger)) Echos are displayed in console but I can't make it wait for user input: gdm is started straight away. Any pointers? Thanks a lot

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• Do superuser things with normal user

  - by OrangeTux

  I want to secure the SSH access to my server. One thing I read everywhere is to disable the root user login. To still have access via SSH I created another user via sudo adduser john How can I still do root things with this account? sudo command asks for a password of the user but gives john not in sudoer file. Action will be reported. When I use su I log in as root which I'm going to disable. How can I stil do root things with the normal account john?

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• Backing up a Windos 7 partition from Macbook with no OS X

  - by mattcodes

  I have a 3 year macbook with Windows 7 installed as 40gb and OS X as 40gb (80gb HD). I want to remove OS X as Im at the limit of 40gb on Windows and I have not logged on to Mac OS X since installed Win7 (dont flame me). So I want to delete OS X partition and expand my win partition to 80gb BUT I still would like to be able to regularly (once a week/month) backup my Windows 7 partition - its took a while to setup everything up right - not just docs and programs - so when the hard drive dies I want to be able to restore the partition and boot away, (the daily volatile bits I can pull down from dropbox and project from soure control). With Mac OS X I could use Winclone - and this worked flawless last time the HD failed with XP but with the absence of OS X I will need something else. Im thinking can I use a Linux Live boot CD along with an external USB hard drive. Boot from CD and then dd? the partition to the USB? What linux distro live CD should I use? I say dd as if I know what am taking about (I dont) is this the best way to backup a partition (when it will be restored to same hardware as bootable) ? What command?

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• Eliminating Windows 7 user tracking registry writes

  - by caffiend

  Windows 7 continues the practice of saving user actions in the registry. I'd like to disable this practice both to avoid reg-file fragmentation and SSD wear, as well as being uncomfortable with programs being able to quickly analyze my usage habits. Even with the "Turn off user tracking" policy enabled, there are at least two areas that still contain user tracking: HKCU\Software\Classes\Local Settings\MuiCache This key stores a cache of most-recently accessed strings, including most-recently ran exe descriptions. MKCU\Software\Classes\Local Settings\Software\Microsoft Windows\Shell\BagMRU This directory stores the most recently viewed folders along with timestamps. Are there additional policy settings/registry entries to disable these writes? If not, is it possible to make these entries Volatile? Would it be practical to create a temporary hive (eg, on ramdisk) and map it over this location?

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• VirtualBox to use dual monitors

  - by fnord_ix

  I am am running Kubuntu Hardy Heron, with a dual monitor setup, and have VirtualBox on it running Windows XP in seamless mode. My problem is, I can't get virtualbox to extend to the second monitor. Has anyone been able to achieve this or know if it can be achieved?

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• How large is the performance loss for a 64-bit VirtualBox guest running on a 32-bit host?

  - by IllvilJa

  I have a 64-bit Virtualbox guest running Gentoo Linux (amd64) and it is currently hosted on a 32-bit Gentoo laptop. I've noticed that the performance of the VM is very slow compared to the performance of the 32-bit host itself. Also when I compare with another 32-bit Linux VM running on the same host, performance is significantly less on the 64-bit VM. I know that running a 64-bit VM on a 32-bit host does incur some performance penalties for the VM, but does anyone have any deeper knowledge of how large a penalty one might expect in this scenario, roughly speaking? Is a 10% slowdown something to expect, or should it be a slowdown in the 90% range (running at 1/10 the normal speed)? Or to phrase it in another way: would it be reasonable to expect that the performance improvement for the 64-bit VM increases so much that it is worth reinstalling the host machine to run 64-bit Gentoo instead? I'm currently seriously considering that upgrade, but am curious about other peoples experience of the current scenario. I am aware that the host OS will require more RAM when running in 64-bit, but that's OK for me. Also, I do know that one usually don't run a 64-bit VM on a 32-bit server (I'm surprised I even got the VM started in the first place) but things turned out that way when I tried to future proof the VM I was setting up and decided to make it 64-bit anyway.

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• After deleting a local machines offline file cache, the same user's "my documents" no longer redirects to the network location.

  - by stead1984

  One of my apprentices was tasked with clearing out unused local profiles and clearing the offline file cache. After he cleared the offline file cache and rebooted the machine, he would log in as himself and no longer have his "my documents" redirected to the set network location. More over this seemed to then affect ANY other networked machine he logged into, except his own laptop. All our standard workstations run Windows XP Service Pack 3, the apprentice's laptop runs Windows 7 Professional. I can understand how clearing the offline file cache after deleting old local profiles could cause this issue but draw a complete blank as to why it would affect all networked machines. It's a strange one so this question may be a little hard to understand so any questions or further understanding required please ask.

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• vim: remove previous code indentation and convert to another

  - by ramgorur

  I have a c project with multiple files (more than 100), the codes are written in Whitesmiths style, but I want to change them into K&R style indentation. Is it possible to do using vim in an automated way ? For example I have a emacs-lisp script to achieve this -- (progn (find-file "{}") (mark-whole-buffer) (setq indent-tabs-mode nil) (untabify (point-min) (point-max)) (indent-region (point-min) (point-max) nil) (save-buffer)) I was wondering if there is a similar trick that could be done with vim.

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• INACCESSIBLE_BOOT_DEVICE after installing Linux on same drive

  - by kdgregory

  History: My PC was configured with two drives: an 80G on IDE 0 Primary that was running Win2K, and a 320G on IDE 0 Secondary that was running Linux (Ubuntu). I decided to pull the 80Gb drive out of the system, so dd'd the entire 80 G drive (/dev/sda) onto the 320 (/dev/sdb) -- this included the MBR and partition table. Then I pulled the drive, plugged the 320 into IDE 0 Primary, and rebooted. The Windows partition worked at this point. Then I installed Ubuntu into the remaining space on the 320. It works. However, when I try to boot into Windows, I get a BSOD with the following message: *** STOP: 0x0000007B (0x89055030,0xC000014F,0x00000000,0x00000000) INACCESSILE_BOOT_DEVICE Before the BSOD I see the Win2K splash screen, and it claims to be "starting windows" for a couple of seconds -- so it appears that the first stage boot loader is working as expected. Ditto when I try booting in Safe Mode. After reading the Microsoft KB article, I booted into the recovery console and tried running chkdsk /r. It refused to run, claiming that the drive was corrupted (sorry, didn't write down the exact error message). However, I can mount the drive from Linux, and access all files. And for what it's worth, I can scan the drive using the Linux "Disk Utility" (this is Ubuntu, the menus don't show real program names), it claims the drive to be clean. The KB article mentioned that boot.ini could be the problem, so here it is: timeout=10 default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS [operating systems] multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows 2000 Professional" /fastdetect Any pointers on what to do next?

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• Problem with Ubuntu 10.04 and ATI

  - by Maximilinao

  I'm having a problem installing the drivers from the video card. Just finished installing the driver, reboot my OS, and my monitor is starting off in energy saving mode and does not boot Ubuntu. What I can do? Sorry for my English. I used the Google translator.

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• I can't write to a folder which I'm a member of

  - by user3265472

  I'm trying to setup folder access to a group so that all members of that group can create/edit/delete files within the folder. # create my group and add a member sudo addgroup dev sudo adduser martyn dev Now, logged in as "martyn", check my user has been added to "dev" group groups martyn martyn : martyn dev Now I want to change the group ownership of my project folder so all members of that group can edit it and files/folders within it. sudo chgrp -R dev myproject Just to check: martyn@localhost:/var/www$ ls -l total 4 drwxrwxr-x 3 dev dev 4096 May 31 15:53 myproject Now here's where it fails. I want to create a file within myproject (logged in as "martyn", a member of "dev"): vi myproject/test ..but when I try to save the file I get the following error: "myproject/test" E212: Can't open file for writing Why, as user "martyn" which is a member of "dev", can I not write this file? Even if I create the file so it exists, change the ownership to "dev" then try to edit and save - I get the same error.

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• how to setup a ssh acount with no terminal but port forwarding?

  - by admalledd

  I am trying to set up a new user account I can give to friends so they can SSH into my forward computer, and only allow forwarding of certain ports. I do not want my friends to have a shell, or be able to change what ports to where they are allowed to forward. example session: joe(friend) connects using PuTTY (that I have pre-set, he isn't good with computers) to example.com(my Internet facing computer) forwarding ports 8080,1990,25565 to him(with what ever end ports he wants, preferably they stay the same numbers) example ssh command to do similar (but he can still change the ports on my computer!) ssh -N [email protected] -p443 -L8080:192.168.1.2:8080 -L1990:127.0.0.1:1990 -L25565:127.0.0.1:25565 then, same story with other friend smith(same ports, same user even) except he is using linux, so cant use putty. is it possible to also leave default SSH functinality for all other users but this one? I found this when I was searching google, but alas, I did not quite understand what was being suggested, and I don't think they covered restricting port forwarding

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• Windows network: deny file access to another user if file is currently open

  - by Steve

  Some users on my network are having difficulties saving files, because the file is open elsewhere. Let's say Lemuel wants to edit a file, but Bernice in the next office over is working on it. Lemuel opens, edits, and tries to save, but then gets a "no write access" error. Bernice chortles with glee (since earlier that week Lemuel stole her sandwich). Unfortunately, various softwares will not warn the user that they have opened a read-only file. Is there a way (in Windows) to limit file access to ONE user only, i.e. 777 for the first user to open the file, and 000 for all users after that? (Sorry for the Linux terminology but it gets my point across).

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• VirtualBox Port Forward not working when Guest IP *IS* specified (while doc says opposite)

  - by Patrick

  Trying to port forward from host (Mac OS X) 127.0.0.1:8282 - guest (CentOS)'s 10.10.10.10:8080. Existing port forwards include 127.0.0.1:8181 and 9191 to guest without any IP specified (so whatever it gets through DHCP, as explained in the documentation). Here is how the non-working binding was added: VBoxManage modifyvm "VM name" --natpf1 "rule3,tcp,127.0.0.1,8282,10.10.10.10,8080" Here is how the working ones were added: VBoxManage modifyvm "VM name" --natpf1 "rule1,tcp,127.0.0.1,8181,,80" VBoxManage modifyvm "VM name" --natpf1 "rule2,tcp,127.0.0.1,9191,,9090" And by "non-working", I of course mean not listening (as a prerequisite to forwarding): $ lsof -Pi -n|grep Virtual|grep LISTEN VirtualBo 27050 user 21u IPv4 0x2bbdc68fd363175d 0t0 TCP 127.0.0.1:9191 (LISTEN) VirtualBo 27050 user 22u IPv4 0x2bbdc68fd0e0af75 0t0 TCP 127.0.0.1:8181 (LISTEN) There should be a similar line above but with 127.0.0.1:8282. Just to be clear, this port is listening perfectly fine on the guest itself. And when I remove the guest IP (i.e., clear the 10.10.10.10) the forward works fine, albeit to eth0 (not eth1 where I need it). I can tcpdump and watch the traffic flow back and forth. And yes, I've disabled iptables entirely while testing -- it's not getting blocked anywhere on the guest. As VirtualBox writes in their documentation, you are required to specify the guest IP if it's static (makes sense, no DHCP record it keeps): "If for some reason the guest uses a static assigned IP address not leased from the built-in DHCP server, it is required to specify the guest IP when registering the forwarding rule:". However, doing so (as I need to), seems to break the port forward with nary a report in any log file I can find. (I've reviewed everything in ~/Library/VirtualBox/). Other notes: While I used the above command to add the third rule, I've also verified it showed up correctly in GUI and then removed/re-added from there just to make sure). This forum link -- while very dated -- looks somewhat related in that a port forward to a static IP was not appearing (perhaps they think due to lack of gratuitous arp being sent for host to know IP is there/avail?). Anyway, what gives? Is this still buggy? Any suggestions? If not, easy enough workarounds? What's interesting is that this works perfectly fine on another user's Mac, however he's running a slightly older version (4.3.6 v. 4.3.12).

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• Desktop file for my pythin script

  - by Jason94

  Hi! I would like to make a .desktop file for my Python script, but so far the only thing i have is a clickable icon on my desktop! It does nothing when i click it, so im guessing there is something wrong with the execution :) The desktop file: [Desktop Entry] Version=1.0 Type=Python Exec=/home/user/MyDocs/Python/EasySteer/Main.py Name=EasySteer Icon=steering_wheel X-Icon-Path=/usr/share/icons and I also tried: [Desktop Entry] Version=1.0 Type=Application Exec=/usr/bin/xterm "python /home/user/MyDocs/Python/EasySteer/Main.py" Name=EasySteer Icon=steering_wheel X-Icon-Path=/usr/share/icons But nothing works :D if it matters this is for my Nokia N900 mobile phone that runs Maemo linux, but i think the basics are the same.

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• How do I prevent my computer from freezing when it starts to swap?

  - by cdauth

  I work as a Java programmer, so I often have to run several programs at the same time that consume a lot of memory. When my memory is full and Linux starts swapping, my computer almost completely freezes. I can see that it is heavily writing on the hard-disk and everything reacts really slowly, often not at all. Moving the mouse in X sometimes doesn’t work at all, sometimes it has a delay of several seconds, clicking usually has a delay of several minutes. Sometimes it is possible to change to the TTY (with a long delay), there I can usually type without delay, but when I try to log in, it takes several minutes after typing in the user name until the password prompt appears, and usually an error message appears that tells me that the login timed out. So the only possibility is usually to restart the computer. I noticed that other intensive writing to the hard disk also significantly slows down my computer. Sometimes, I used rsync to limit the bandwidth when I copied files around on my own computer, as else the system would be almost unusable. How can this be? At the moment it seems more useful to me to completely turn off swapping. That might crash some processes, which is unfortunate, but the alternative at the moment is to crash all processes by turning off my computer. I am using Gentoo Linux with kernel 3.6.2-gentoo, I have a 10 GB swap partition on a HDD.

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• Desktop file for my Python script

  - by Jason94

  I would like to make a .desktop file for my Python script, but so far the only thing i have is a clickable icon on my desktop! It does nothing when I click it, so im guessing there is something wrong with the execution :) The desktop file: [Desktop Entry] Version=1.0 Type=Python Exec=/home/user/MyDocs/Python/EasySteer/Main.py Name=EasySteer Icon=steering_wheel X-Icon-Path=/usr/share/icons and I also tried: [Desktop Entry] Version=1.0 Type=Application Exec=/usr/bin/xterm "python /home/user/MyDocs/Python/EasySteer/Main.py" Name=EasySteer Icon=steering_wheel X-Icon-Path=/usr/share/icons But nothing works :D if it matters this is for my Nokia N900 mobile phone that runs Maemo linux, but I think the basics are the same.

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