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  • Increase Volume of an MKV Video from Linux Terminal

    - by The How-To Geek
    I've got a large amount of .MKV video files which seem to all play at a very low volume - I end up having to turn the TV up all the way to hear them, which is really irritating when I switch to another channel and wake the dead because it's so loud. What I'm looking for is a command-line method to increase the volume (so I can run it on all of them quickly) that would hopefully work regardless of the audio codec in use in the particular file. (I don't mind hard-coding the output audio though). For reference, I'm using Ubuntu 9.04 on my server, and the files are being played back with Boxee on a Mac Mini, but the volume problem is the same on Windows too.

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  • java memory allocation under linux

    - by pstanton
    I'm running 4 java processes with the following command: java -Xmx256m -jar ... and the system has 8Gb memory under fedora 12. however it is apparently going into swap. how can that be if 4 x 256m = 1Gb ? EDIT: also, how can all 8Gb of memory be used with so little memory allocated to basically the only thing running? is it java not garbage collecting because the OS tells it it doesn't need to or what? TOP: top - 20:13:57 up 3:55, 6 users, load average: 1.99, 2.54, 2.67 Tasks: 251 total, 6 running, 245 sleeping, 0 stopped, 0 zombie Cpu(s): 50.1%us, 2.9%sy, 0.0%ni, 45.1%id, 1.1%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 8252304k total, 8195552k used, 56752k free, 34356k buffers Swap: 10354680k total, 74044k used, 10280636k free, 6624148k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1948 xxxxxxxx 20 0 1624m 240m 4020 S 96.8 3.0 164:33.75 java 1927 xxxxxxxx 20 0 139m 31m 27m R 91.8 0.4 38:34.55 postgres 1929 xxxxxxxx 20 0 1624m 200m 3984 S 86.2 2.5 183:24.88 java 1969 xxxxxxxx 20 0 1624m 292m 3984 S 65.6 3.6 154:06.76 java 1987 xxxxxxxx 20 0 137m 29m 27m R 28.5 0.4 75:49.82 postgres 1581 root 20 0 159m 18m 4712 S 22.5 0.2 52:42.54 Xorg 2411 xxxxxxxx 20 0 309m 9748 4544 S 20.9 0.1 45:05.08 gnome-system-mo 1947 xxxxxxxx 20 0 137m 28m 27m S 13.3 0.4 44:46.04 postgres 1772 xxxxxxxx 20 0 135m 25m 25m S 4.0 0.3 1:09.14 postgres 1966 xxxxxxxx 20 0 137m 29m 27m S 3.0 0.4 64:27.09 postgres 1773 xxxxxxxx 20 0 135m 732 624 S 1.0 0.0 0:24.86 postgres 2464 xxxxxxxx 20 0 15028 1156 744 R 0.7 0.0 0:49.14 top 344 root 15 -5 0 0 0 S 0.3 0.0 0:02.26 kdmflush 1 root 20 0 4124 620 524 S 0.0 0.0 0:00.88 init 2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 4 root 15 -5 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0

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  • Linux command line based spam checker?

    - by anonymous-one
    Does a command line based spam checker exist? We have created a mailbox at a 3rd party, and unfortunately decided on spam checking 'disabled' in the initial setup. There is no way to re-enable spam checking, the mailbox must be delete (and thus all contents lost) and re-created. Does anything exist where we can pump in either: A) Subject + from + to + body + all other fields. OR B) Raw message dump (headers + body). And the command line will let us know weather the email is possibly spam? Thanks.

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  • Where is my software installed in Linux?

    - by user22861
    I use whereis matlab and find: /usr/local/bin/matlab , which is a very long bash file. How can I find where matlab is installed, I mean, its installed folder. EDIT: I used the following method: open matlab and use edit svds.m to open the svds.m file and the editor shows the folder:)

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  • linux cron job error

    - by bell
    I have setup a cron job to run a php file every 30 minutes, lynx -source public_html/scripts/file.php the result comes through to an email but seems to get this error Can't Access `file://localhost/home/username/public_html/scripts/file.php' Alert!: Unable to access document. lynx: Can't access startfile any advice would be much appreciated

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  • Unix / linux permissions setup for shared hosting with Apache

    - by weiyin
    I'm in the process of setting up a server from a clean CentOS 5 install. What is the best permission structure (users, groups, unix permissions) for running a single instance of apache for multiple users? Ideally, it should satisfy these requirements: Each user's websites are stored in a subdirectory of their home directory. Users can edit files and permissions. Apache can read the websites of all users. No user can read the website files of other users. Bonus question: how to add PHP and/or Perl and/or Ruby to Apache without allowing any users to access any other user's files?

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  • Strange 3-second tcp connection latencies (Linux, HTTP)

    - by user25417
    Our webservers with static content are experiencing strange 3 second latencies occasionally. Typically, an ApacheBench run ( 10000 requests, concurrency 1 or 40, no difference, but keepalive off) looks like this: Connection Times (ms) min mean[+/-sd] median max Connect: 2 10 152.8 3 3015 Processing: 2 8 34.7 3 663 Waiting: 2 8 34.7 3 663 Total: 4 19 157.2 6 3222 Percentage of the requests served within a certain time (ms) 50% 6 66% 7 75% 7 80% 7 90% 9 95% 11 98% 223 99% 225 100% 3222 (longest request) I have tried many things: - Apache2 2.2.9 with worker or prefork MPM, no difference (with KeepAliveTimeout 10-15) - Nginx 0.6.32 - various tcp parameters (net.core.somaxconn=3000, net.ipv4.tcp_sack=0, net.ipv4.tcp_dsack=0) - putting the files/DocumentRoot on tmpfs - shorewall on or off (i.e. empty iptables or not) - AllowOverride None is on for /, so no .htaccess checks (verified with strace) - the problem persists whether the webservers are accessed directly or through a Foundry load balancer Kernel is 2.6.32 (Debian Lenny backports), but it occurred with 2.6.26 also. IPv6 is enabled, but not used. Does the issue look familiar to anyone? Help/suggestions are much appreciated. It sounds a bit like a SYN,ACK packet getting lost or ignored.

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  • Linux Permissions

    - by Tres
    I am running Fedora 12 and I've setup a partition separate from my root partition to keep shared files and home directories. Now, I've been having permission issues where it says the user cannot chdir into their home directory (/files/home/*). Now, I fixed this originally by chmodding / to 0755 and the home directories also to 0755. And yes, the user is the owner:group of their home directory. Now get this, I didn't change a thing, rebooted, everything still works. Great, right? I boot the server up a day later, and now same ol issue. This is a home server that wasn't on at all at any point in between the working state and non-working state. Also, nothing else was modified. Any ideas? Thanks!

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  • Linux: Create files and direcotires but not delete them

    - by Peraz
    I have a process that create directories and files inside a working directory, ex: /workingdir/file1 /workingdir/file2 /workingdir/dir1/file1 /workingdir/dir1/dir2/file1 /workingdir/dir1/file2 I need to avoid deletion/overwrites of created folders/files for that user, but allow subsequent folders/subfolders/files creation. I try permissions, gid, acl with no luck. What is the correct way to do that ? (i can use a cron job if needed)

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  • Unable to start my linux (cent OS ) machine in run level 5

    - by k38
    Suddenly my machine not working under run level 5 and it seems to be problem with xserver and it is saying that "in last 90 seconds xserver restarted 6 times and unable to start" and then just giving blank screen.So i changed the run level to 3 and using startx command i am managing to work now.can any one help me on this.......?

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  • Unable to start my linux (cent OS ) machine in run level 5

    - by k38
    Suddenly my machine not working under run level 5 and it seems to be problem with xserver and it is saying that "in last 90 seconds xserver restarted 6 times and unable to start" and then just giving blank screen.So i changed the run level to 3 and using startx command i am managing to work now.can any one help me on this.......?

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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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  • linux output show only right of ':'

    - by acidzombie24
    I forgot a lot of my command line. I am doing cat file | grep "error" and i would like it to show everything to the right of G:/ including G:/ if possible. I figure its an awk command but i dont know what. I tried awk '{print $8+}' but + does not work like i hoped and guessed.

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  • linux rsync problem

    - by friends
    i following the tutorial of the http://www.howtoforge.com/mirror-your-web-site-with-rsync-on-fedora-10 i have completely step by step following the instructions and setup the key, script my problem is when i use server1 to type the command , it still prompt me for password. then i look the /var/log/secure, i 've found the message Authentication tried for root with correct key but not from a permitted host (host=123132132312.static.ctinets.com, ip=20x.80.236.xxx). can anyone help?

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  • Monitoring disk block access in Linux

    - by VoidPointer
    Is there a way to gather statistics about blocks being accessed on a disk? I have a scenario where a task is both memory and I/O intensive and I need to find a good balance as to how much of the available RAM I can assign to the process and how much I should leave for the system for building its I/O cache for the block device being used. I suspect that most of the I/O that is currently happening is accessing a rather small subset of the device and that performance could be optimized by increasing the RAM that is available for I/O buffering. Ideally, I would be able to create something like a "heat-map" that shows me which parts of the disk are accessed most of the time.

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  • Linux (Ubuntu) USB Auth

    - by themicahmachine
    I want to be able to authenticate with PAM using a USB drive with a file on it. I've read about how to do this with a PAM module that reads the specific USB hardware ID of a device, but if the device malfunctions or is lost, there would be no way to authenticate. I would prefer to use the method BitLocker uses, requiring a particular file to be found on the drive in order to authenticate. That way I can keep another drive in a secure location as a backup. Any other suggestions are welcome. I just want to require a higher level of security that just a password.

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  • linux renames folders automatically

    - by Moataz Elmasry
    I have a file server with ubuntu-server installed it is accessed usually through smb either from pc (ubuntu) or laptop (windows 7) Sometimes it happens that folder names on the file server are changing to some meaningless name, like TOZC0N~L or TOJNL7~U The hard disks seem to be fine, and I can´t imagine that samba is messing up folder names. There is no rule really for this problem and I can´t reproduce it, it just happens sometimes Any ideas???

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  • Linux virtualized screen resolution

    - by vladev
    Hopefully there is a positive answer to this question: I have a 15.4" laptop with native screen resolution of 1920x1200. You can imagine that everything is completely unreadable by default. If I increase the font size it becomes readable, but ugly. Is it possible to set the "real" resolution to 1920x1200 so it plays nice with the monitor, but set some "virtual" resolution of 1440x900 so that everything starts looking nice. Note: If I just change the resolution to 1440x900 everything becomes blurry, since this is not the monitor's default resolution. I know that having a small monitor with high resolution is not very optimal - not my choice. (Using nvidia GF8400M)

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  • Output of free -m on a Linux server

    - by cat pants
    I can see from this page here: http://www.linuxatemyram.com/ That the correct amount of free ram is on the "-/+ buffers/cache" line. The extra ram being used is for disk caching. However, I noticed that the total amount of memory used listed in "-/+ buffers/cache" line is significantly less than the sum total of the "RES" column of the processes shown in top. And AFAIK, the "RES" column is how much physical memory is being used by a process. How do you explain this discrepancy?

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  • How to autostart service in ANY linux?

    - by user329115
    I need to install the dumbest possible service (a binary) and have it reliably run as the current user at boot (or login, whatever) at as many platforms as possible (of the aging point-of-sale type). The app monitors another archives generated by another app in the user-session. Startup alternatives considered: init.d @reboot in crontab a .desktop file in ~/.config/autostart a myriad of other solutions including .profile and .bashrc All of the above break down at some point. The problems stem from not wanting to run as root (I want the files generated to be user-accessible), and not having a way to reliably get the current user name in sudo on all platforms. Ideally not even sudo can be assumed available. Hey, I just want to run something on boot and I have "root" power to do so. Windows get the job done easily enough. This isn't rocket science, is it?

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