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  • How to open a program on particular desktop?

    - by Vi
    When I start GUI program, it's window appears appears on currently active desktop (essentially, on random desktop). How to make it to appear on the specified desktop? For example, at startup I want certain programs to be started and distributed to desktops. I've already set up config file of openbox to force some programs to always start on specific desktop. Ideally it should be like: start_on_desktop 1 gnome-terminal --tab -e program1 --tab -e program2 start_on_desktop 2 gnome-terminal --tab -e program3 --tab -e program4 start_on_desktop 3 firefox It should be able to start the same program on other desktop. Also dislike when I start program while being on desktop X then switch to desktop Y and SUDDENLY a program which should be on X appears on Y. When I start lots of programs on and switch often between desktops they end up being in chaos and I need to collect them together and redistribute sanely. Also I want the first initial gnome-terminal to be on desktop 3, but I also want subsequent gnome-terminals to be on the desktop where I pressed the keystroke (also configured in openbox) that launches gnome-terminal.

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  • Transparently decompressing data in archive to allow greater compression later

    - by Vi.
    I have, for example, filesystem image which have some compressed files (with weak compression such as gzip), for example, manpages or archives with the same uncompressed content nearby. How to pre-filter the data to "expand" compressed data to plain form (to re-compress it with strong compression) and then post-filter after decompression to restore original "semi-compressed" image? SHA-1 match is advices but not strictly required (but the resulting image must work, e.g. re-compressed files should not grow too much, be decompressible etc.) Like improving compression ratio by reversing weak compression algorithms. Are there programs for this?

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  • Stronger laptop_mode in Linux

    - by Vi
    Can I have stronger laptop mode in Linux? I want to spin down the hard drive and prevent it to spin up even if something wants to read something not in cache. In general I want to have these modes: Normal Current laptop mode Stronger laptop mode: spin up only when needs to read something uncached (and cache it). No spinups to write something unless really memory pressure (Exception: explicit "sync" command in console). Kernel is allowed to keep processes in D-sleep for 10 seconds for that. Forced laptop mode: do not spin up, period. Keep offending processes in D-sleep unless I turn off this mode. Like there is a bomb instead of hard drive. I also want to have access times tracked (mount -o atime), but I don't want the hard drive to be spinned up only to update them. Is there some settings or kernel patches that can get closer to this? May be I should write special io scheduler for "forced laptop mode"? E.g. echo suspend > /sys/block/sda/queue/scheduler to lock the drive and echo cfq > /ys/block/sda/queue/scheduler to unlock it again?

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  • Why is 'grep -i' so slow? How to do it faster for ASCII?

    - by Vi.
    Consider: $ time lzop -d < tvtropes-index.lzo | egrep -B 5 '[Dd][eE][sS][cC][eE][nN][dD] ?[Ff][rR][oO][mM]' real 0m0.438s $ time lzop -d < tvtropes-index.lzo | egrep -B 5 'descend ?from' -i real 0m11.294s Both search case insensitively. Why is the -i version so slow? How do I make grep -i fast without entering things like [iI][nN] [tT][hH][iI][sS] [wW][aA][Yy]? For example, perl -ne 'print if /descend ?from/i' works fast, but '-B 5' is not as trivial to implement as in grep (as well as other options).

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  • Manually forcing TCP connection to retry

    - by Vi.
    I have a TCP connection (SSH session to some computer for example) Network suddenly goes down and drops all packets (disconnected cable, out of range). TCP resends packets again and again, retrying with increasing delays. I see the problem and plug the cable back (or restore network somehow). TCP connection finally successfully resends some packet and continues. The problem is that I need to wait for a some timeout on point 5. I want to use my opened SSH session now and not wait for 5-10 seconds until it finds out that connection is working again. How to force all TCP connections to resend data without delays in GNU/Linux?

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  • Manually forcing TCP connection to retry

    - by Vi
    I have a TCP connection (SSH session to some computer for example) Network suddenly goes down and drops all packets (disconnected cable, out of range). TCP resends packets again and again, retrying with increasing delays. I see the problem and plug the cable back (or restore network somehow). TCP connection finally successfully resends some packet and continues. The problem is that I need to wait for a some timeout on point 5. I want to use my opened SSH session now and not wait for 5-10 seconds until it finds out that connection is working again. How to force all TCP connections to resend data without now in GNU/Linux?

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  • Alternatives to y4mstabilizer; deshaking video

    - by Vi
    "Deshaking" means fixing the video captured from camera hold in hands. Is there open source video deshaker apart from y4mstabilizer from mjpegtools? Patch for mencoder is preferred. My current command line for processing video looks like: mplayer video_from_camera.avi -nosound -vo yuv4mpeg:file=/dev/stdout -really-quiet | y4mstabilizer -n -a 0.8 -r 30 -s 100 | mplayer -cache 1000 /dev/stdin -noconsolecontrols -vf crop=500:380:70:50,denoise3d=3:3:5:5 -vo yuv4mpeg:file=temporary.yuv y4mstabilizer is itself very unstable and often crashes (and it didn't work at all until I have patched memory allocation in it).

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  • How to open a program on particular desktop?

    - by Vi.
    When I start GUI program, it's window appears appears on currently active desktop (essentially, on random desktop). How to make it to appear on the specified desktop? For example, at startup I want certain programs to be started and distributed to desktops. I've already set up config file of openbox to force some programs to always start on specific desktop. Ideally it should be like: start_on_desktop 1 gnome-terminal --tab -e program1 --tab -e program2 start_on_desktop 2 gnome-terminal --tab -e program3 --tab -e program4 start_on_desktop 3 firefox It should be able to start the same program on other desktop. Also dislike when I start program while being on desktop X then switch to desktop Y and SUDDENLY a program which should be on X appears on Y. When I start lots of programs on and switch often between desktops they end up being in chaos and I need to collect them together and redistribute sanely. Also I want the first initial gnome-terminal to be on desktop 3, but I also want subsequent gnome-terminals to be on the desktop where I pressed the keystroke (also configured in openbox) that launches gnome-terminal.

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  • Doing "text mode 'splash' game" during boot.

    - by Vi
    Sometimes I want to do something (for example, playing a simple text-mode game) while the system is booting up. This is especially useful when lengthy reiserfs transaction replays are happening. Current hacky way of doing it is: Put the program on initramfs. Before running /sbin/init, "openvt 2 /my/program". Turn off messages from kernel (sysrq 0) Override /dev/console with /dev/null (to prevent boot messages). The problems are: There are STILL some messages interfering with program output. I can't see boot messages by switching to that virtual terminal back. After finishing the boot sequence, /dev/tty2 ends up being attached both to getty and my program. How to do it properly without of running graphical splashes? The system is Linux Debian Squeeze, no dependency based sysv scripts.

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  • How to tell Linux to explicitly swap out main memory of suspended process?

    - by Vi
    I run a memory-hungry process (mkcromfs) which consumes more memory than I have physical memory on my latop, so it is paging and swappin and thrashing all the time and loadavg is about 2 (compcache is already in use with usual swap partition as well), but slowly moving forward (Although I afraid it will finally try to allocate 2GB and crash draining 2 days of thrashing). When I want to use the laptop for something else, I stop the process, start X server, firefox and other programs. The problem is that when I start Firefox the loadavg jumps to 10 and the system becomes almost unresponsive at all (long time to turn on/off caps lock, slow mouse cursor position updates, slow switching from X server to Linux console, slow login). The stopped mkcromfs still holds a lot of memory (464.8 MiB and slowly falling) and moves it to swap only when more memory is needed for some other program, which results in a great slowdown. How to tell the Linux to swap out this process entirely (e.g. I'm not intending to resume it in short term), possibly waking from swap other data? Also it will be useful to be able to specify the exact swap device to swap the given process out.

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  • Cursor movement history in Vim

    - by Vi
    How can I restore cursor position in Vim as it was before scrolling, selecting or PgUp/PgDn? I'm tired of searching where I was before I scrolled up to look something at the top. Are there something like "Prev cursor position" and "Next cursor position" commands (like 'u' and 'R' for regular undo/redo)?

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  • Why my USB mouse get suspended after 3 seconds of inactivity?

    - by Vi.
    Mouse's bottom LED goes off after 3 seconds after connection and cursor movements and wheel stops. Pressing any button, reconnecting or resetting USB device resumes it for another 3 seconds (when resumed by pressing button, this event does no go to X). This happens when using any of USB ports. This mouse works well with other computer with Linux. It was working well before. Why can it happen? How to fix it? Update: It happens only if laptop is on battery. Answer: this is caused by powersaving done by laptop-mode-tools. To temporary turn off powersaving one can use for i in /sys/bus/usb/devices/*/power/control; do echo on > $i; done

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  • How to output a simple network activity plot in console in Linux?

    - by Vi.
    There's tload that plots load average. There's iftop that network usage as bars. How to do something like this: # tcpdump -i eth0 --plot 'host 1.2.3.4' 13:45:03 | | 0 in 0 out 13:45:04 |O | 0 in 1MB out 13:45:05 |OOOI | 500 KB in 4MB out 13:45:06 |OIIII | 6MB in 1MB out 13:45:07 | | 0 in 0 out 13:45:08 |IIIIIIIIIIII | 53M in 0 out

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  • Running suspicious X programs in GNU/Linux

    - by Vi
    What the most harmful thing can malware program started as separate limited user account do if it has access to the X server? Network and filesystem things are already considered by chroot and netfilter. It obviously can lock the screen and I will need to switch to other vt and kill it manually. Can it for example disrupt other GUI programs on the same X server (access to root terminal in nearby window)? I know that it is safer to run it in separate X server, for example, in Xtightvnc or even some virtual machine, but how dangerous is to just run it like other programs?

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  • How to send Ctrl+Alt+F1 to window (to switch terminal remotely, not locally)?

    - by Vi
    when I press Ctrl+Alt+F{1..12}, it switches me to other virtual terminal. When I have VNC/rdesktop client (and there it is VMWare/Virtualbox with other Linux) I want to switch virtual terminal remotely, but just pressing Ctrl+Alt+F1 switches things locally. VirtualBox/VMWare often provides special means to send Ctrl+Alt+Del, but not Ctrl+Alt+F1. (I already know that I can log in over ssh and chvt)

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  • Is there good FAT driver for FUSE? (Lightweight, not mountlo)

    - by Vi.
    FUSE filesystem list show some FuseFat and FatFuse. Both are old, FatFuse is read-only , FuseFat is non-buildable and probably depends on glib. Now I'm using mountlo for the task (mounting USB drives in generic way without root access or suid things (except of fusermount itself)), but it looks too big for such task. Using FUSE to mount external storage devices is good both for security and for flexibility reason: the kernel sees only block reads and writes while actual code that deals with filesystem details runs with user privileges, allowing user to use custom filesystems and preventing from kernel filesystem exploits. Is there good vfat FUSE driver?

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  • How to get scrolling plot in Linux (using command-line tools)?

    - by Vi
    Supposing I have a program that prints lines with data periodically, how can I turn then info them into graphical plot that updates itself each time new line available? $ ./prog 10 44 20 66 30 55 40 58 50 59 55 58 60 77 ^C $ ./prog | scrollingplot Window appears and updates on each line printed: 80| | ---- | ---- ______...__/ | / ----- | - 40| ------------------------------- 10 20 30 40 50 60 # Note that ASCII art-style plot is just for example, # I want simple X window like in mplayer. There are enough tools for static data, but I haven't seen ones for updating data (except of ksysguard).

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  • Why does pasting sometimes not work in gnome-terminal?

    - by Matthew
    Ctrl + Shift + C and Ctrl + Shift + V are supposed to replace the normal Ctrl + C and Ctrl + V in gnome-terminal. Sometimes they work, but usually they have no effect. What are some potential reasons for this? I'm not sure what other information to give. Edit: It seems that manually selecting Paste from the Edit menu does not work either. Right click > Paste works, but Edit > Paste does not. Copying works, but pasting does not. Also, I have vi-mode enabled (set -o vi in my ~/.bashrc). Could this have something to do with it? Edit: Here is a video demonstrating the problem. I used Screenkey (in "raw" mode, to catch "shift") to show what keys I am pressing.

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  • chmod - file permission on writable

    - by user1350338
    I am running Ubuntu 12.04 x64 server on ext4 partition. I set a directory's permission to '766' as below. sudo chmod 766 /archive drwxrw-rw- 3 root root 4096 Sep 27 10:50 archive/ <BR><BR><BR> But, when I tried to create new file through vi editor, permission error has occured. vi /archive/test.txt -------- > "/archive/test.txt" [Permission Denied] I thought I had "write" permission. Could anyone help me what is the problem?

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  • How to Get Vim to do Filename Completion Even When You are Root

    - by user12608033
    From the Obscure Unix Admin Tip of the Day section... If you occasionally edit files as root (I never do, I always use pfexec, wink wink), then you may have noticed that the vim (Vi Improved) editor that normally does filename completion via the <Tab> key now gives you something like: :e /etc/mo^I when you try to open up /etc/motd with a little less typing So, there are at least three solutions to this: Use <Ctrl>-E instead of <Tab> Use the "-N" flag when you start Vim :set wildchar=<Tab> (Enter those 5 characters, not an actual Tab) The reason for this? It seems that when you are root, Vim sets it's "compatible" flag, which makes it behave more like its ancestor vi. In turn this makes Vim set 'wildchar' to <Ctrl>-E. For more info, read the section you get when you enter :help cmdline-completion

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  • Yum update not working on CentOS 6.2 minimal install

    - by Owen
    Note: This is my first question on the stack exchange network so please give mercy and provide guidance where needed. I have installed a CentOS 6.2 KVM guest and I am having problem getting yum to work. This is my first time working with CentOS so I feel that it's a setting somewhere that I am missing but cannot find using google. Here are my steps; Downloaded CentOS-6.2-x86_64-minimal.iso, booted, and went through default steps (only questions asked where keyboard, timezone, root password and use entire hdd) Restarted, logged in, pinged google.com to no avail Set the following settings; vi /etc/resolv.conf nameserver 8.8.8.8 nameserver 8.8.4.4 vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE="eth0" HWADDR="52:54:00:42:1B:4A" #NM_CONTROLLED="yes" BOOTPROTO=none ONBOOT="yes" NETMASK=255.255.255.0 IPADDR=192.168.122.151 TYPE=Ethernet vi /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=server3.example.com GATEWAY=192.168.122.1 I can now ping google.com ping google.com PING google.com (173.194.70.139) 56(84) bytes of data. 64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=1 ttl=50 time=5.88 ms 64 bytes from fa-in-f139.1e100.net (173.194.70.139): icmp_seq=2 ttl=50 time=5.77 ms But I cannot 'yum update' yum update Loaded plugins: fastestmirror, presto Loading mirror speeds from cached hostfile Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was 14: PYCURL ERROR 7 - "Failed to connect to 2a01:c0:2:4:216:3eff:fe0d:266d: Network is unreachable" Error: Cannot find a valid baseurl for repo: base My KVM guest is also NAT'd incase it's of concern.

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  • How to ask memcached auth connection by sasl and pam?

    - by user199216
    I use memcached in a untrust network, so I try to use sasl and pam to auth connection to memcached. I installed sasl and pam module, compiled and installed memcached with sasl enabled. Also I created db and table for pam user. I run: $ sudo testsaslauthd -u tester -p abc123 -s /etc/pam.d/memcached 0: OK "Success." where the tester and abc123 is the authed user in db, which I inserted. But my python script cannot be authed, always authentication failed returned. It seems it dose not use pam to authentication, still use sasldb, because when I add user by: $ sudo saslpasswd2 -a memcached -c tester and input password: abc123, It can passed. Python script: client = bmemcached.Client(('localhost:11211'), 'tester', 'abc123') and error: bmemcached.exceptions.MemcachedException: Code: 32 Message: Auth failure. memcached log: authenticated() in cmd 0x21 is true mech: ``PLAIN'' with 14 bytes of data SASL (severity 2): Password verification failed sasl result code: -20 Unknown sasl response: -20 >30 Writing an error: Auth failure. >30 Writing bin response: no auth log found in: /var/log/auth.log Configurations: vi /etc/default/saslauthd MECHANISMS="pam" vi /etc/pam.d/memcached auth sufficient pam_mysql.so user=sasl passwd=abc123 host=localhost db=sasldb table=sasl_user usercolumn=user_name passwdcolumn=password crypt=0 sqllog=1 verbose=1 account required pam_mysql.so user=sasl passwd=abc123 host=localhost db=sasldb table=sasl_user usercolumn=user_name passwdcolumn=password crypt=0 sqllog=1 verbose=1 vi /etc/sasl2/memcached.conf pwcheck_method: saslauthd Do I make my question clear, english is not my native language, sorry! Any tips will be thankful!

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