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• What's the best way to clean up after a fork bomb?

  - by raldi

  $ ls bash: no more processes Uh oh. Looks like someone made a fork bomb. Where I used to work, this pretty much meant that the shared server would need to be power-cycled, since even the sysadmins with root often couldn't get the problem cleaned up. Often, they couldn't even get a prompt. I've heard a few tricks (notably, to send STOP signals rather than KILL signals, since the latter would allow the remaining threads to immediately replace the killed ones), but I've never seen a comprehensive guide entitled So, You Have Yourself a Fork Bomb? Let's make one.

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• What software is available for managing software licenses and hardware serial numbers?

  - by Olly

  I have to manage an increasing number of software licenses and hardware serial numbers across a growing company. To date this has been done using spreadsheets but this is a particularly inflexible solution. Can any other IT managers out there suggest a software solution, ideally web-based, which will help me out?

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• Weird behaviour/rendering of backspace in Terminal.app when SSHing into zsh

  - by Nils Riedemann

  Hi there, I just stumbled upon a weird problem. When I SSH into my server (centos, zsh) and I type some stuff and hit backspace It looks like a space - but internally it really deleted the characters. ls -l a Note that the space between land a is actually when I hit backspace. When I now hit return ls -a gets executed. This is only in zsh, in bash it works fine. Hope anyone has an idea what this is all about and how to fix this.

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• Set a formula on many cells with minimal manual edits

  - by makerofthings7

  I need to set the following formula on many cells: =VLOOKUP(MAX(Historical!$A$5:$FZ$99999),Historical!$A$5:$FZ$99999,7,1) This formula looks up the most recent date in the History table, and returns the value specified. Here I'm returning column 7. How can I paste the cells and auto increment the value where "7" is. In other words I need to paste that summary formula on several hundred cells and change the number 7 for each.

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• How to make cygwin shortcut stick to Windows 7 dock

  - by Frank Krueger

  I have recently installed cygwin on a Windows 7 beta machine. Everything works great, except one little annoyance: The cygwin shortcut (Start-All Programs-cygwin-cygwin Bash Shell) cannot be pinned to the Start menu. My guess as to why is that I already have a "Console" window pinned to the start menu. My guess is that Windows sees that the two EXEs are the same and won't let me pin it. This would be fine except I cannot pin the window to the Dock either. While cygwin is running, WIndows interprets it as just a Command Window and won't let me pin it either. How do you pin the cygwin shortcut to the dock?

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• Added user to CentOS, Updated sshd_config with AllowUsers, Login denied

  - by Gregg

  CentOS 5.3. I can SSH into the system as root just fine. Added a user and set their password. They have shell access (/bin/bash). I can su to the account from root just fine. I updated /etc/ssh/sshd_config with: AllowUsers myNewUser And restarted sshd: /etc/init.d/sshd restart When trying to ssh into the server with the new user, I get a permission denied. And yes, I've double and triple checked that I am using the correct password. Any help is appreciated.

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• Can computer crashes and reboots mean weak power supply?

  - by TomA

  Recently I replaced the videocard in my PC for a newer, faster one. All games work perfectly but I get random system crashes and reboots. This happens even when the system is almost idle (browsing, playing music). It never happened with the old card. All drivers are up-to-date. Is it possible that the power supply is not powerful enough for the new card?

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• Recursively resize images from one directory tree to another?

  - by davr

  I have a large complex directory tree full of JPG images. I would like to create a second directory tree that exactly mirrors the first, but resizing all the images down to a set size (say 2000x1500 or something) and quality (perhaps 85%). Is there any tool that would allow me to easily do this on Windows? I could write some scripts to automate it with bash and image magick, but first want to see if it's already been done. Faster is better too, as I have thousands of images. So something like Photoshop is probably not a good solution as it might take a couple of seconds per image.

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• Backup script that excludes large files using Duplicity and Amazon S3

  - by Jason

  I'm trying to write an backup script that will exclude files over a certain size. My script gives the proper command, but when run within the script it outputs an an error. However if the same command is run manually everything works...??? Here is the script based on one easy found with google #!/bin/bash # Export some ENV variables so you don't have to type anything export AWS_ACCESS_KEY_ID="accesskey" export AWS_SECRET_ACCESS_KEY="secretaccesskey" export PASSPHRASE="password" SOURCE=/home/ DEST=s3+http://s3bucket GPG_KEY="7743E14E" # exclude files over 100MB exclude () { find /home/jason -size +100M \ | while read FILE; do echo -n " --exclude " echo -n \'**${FILE##/*/}\' | sed 's/\ /\\ /g' #Replace whitespace with "\ " done } echo "Using Command" echo "duplicity --encrypt-key=$GPG_KEY --sign-key=$GPG_KEY `exclude` $SOURCE $DEST" duplicity --encrypt-key=$GPG_KEY --sign-key=$GPG_KEY `exclude` $SOURCE $DEST # Reset the ENV variables. export AWS_ACCESS_KEY_ID= export AWS_SECRET_ACCESS_KEY= export PASSPHRASE= If run I recieve the error; Command line error: Expected 2 args, got 6 Enter 'duplicity --help' for help screen. Any help your could offer would be greatly appreciated.

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• Ubuntu Desktop system restore ?

  - by neolix

  Hello Geeks, We are using all the desktop ubuntu 8.04 to 10.04, we are looking same thing like system resorting to back date like windows feature. Around 500 desktop and 79 server we want to setup. Thanks

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• Apache won't serve images larger than ~2K

  - by dtbaker

  Hello, Just upgraded an old box to Ubuntu to 10.04.2 LTS. Apache will not display images to a browser that are over about 2K. Small images seem to display fine. Static HTML and PHP continues to works fine as well. Installed: apache2 2.2.14-5ubuntu8.4 apache2-mpm-prefork 2.2.14-5ubuntu8.4 apache2-utils 2.2.14-5ubuntu8.4 apache2.2-bin 2.2.14-5ubuntu8.4 apache2.2-common 2.2.14-5ubuntu8.4 here is an ngrep of an image that doesn't display fine in the browser: T 192.168.0.4:32907 - 192.168.0.54:80 [AP] GET /path/path/logo.png HTTP/1.1..Host: 192.1 68.0.54..Connection: keep-alive..Accept: application/xml,application/xhtml+ xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5..User-Ag ent: Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13..Accept-Enco ding: gzip,deflate,sdch..Accept-Language: en-US,en;q=0.8..Accept- Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3.... T 192.168.0.54:80 - 192.168.0.4:32907 [A] HTTP/1.1 200 OK..Date: Wed, 09 Mar 2011 05:28:38 GMT..Server: Apa che/2.2.14 (Ubuntu)..Last-Modified: Tue, 05 Oct 2010 11:59:17 GMT ..ETag: "17b6f4-15fe-491dd63eb2f40"..Accept-Ranges: bytes..Conten t-Length: 5630..Keep-Alive: timeout=15, max=100..Connection: Keep -Alive..Content-Type: image/png.....PNG........IHDR...!...v...... .%.....sRGB.........bKGD..............pHYs.................tIME.. etc... This looks ok to me! I have tried firefox and chrome, both display small images fine but when a large image is requested the browser prompts to download the file. When the image file is saved to the local computer it is corrupt, it also takes a long time to save which makes me think the browser cannot see the content-length header sent from apache. Also when I look at the saved image file it includes the headers from apache, along with a bit of garbage at the top, like so: vi logo.png: ^@^UÅd^@$^]V^S^H^@E^@^Q,n!@^@@^F^@^@À¨^@6À¨^@^D^@P^Y¬rÇŹéw^P^@Ú^@^@^A^A^H ^@^GÝ^]^@pbSHTTP/1.1 200 OK^M Date: Wed, 09 Mar 2011 04:47:04 GMT^M Server: Apache/2.2.14 (Ubuntu)^M Last-Modified: Tue, 05 Oct 2010 11:59:17 GMT^M ETag: "17b6ff-157c-491dd63eb2f40"^M Accept-Ranges: bytes^M Content-Length: 5500^M Keep-Alive: timeout=15, max=94^M Connection: Keep-Alive^M Content-Type: image/png^M ^M PNG^M etc... Any ideas? It's driving me nuts. There is nothing in apache error logs, and permissions are fine (because the image data is there, it's just somewhat corrupt). There's no proxy or iptables on this ubuntu box either. Thanks heaps!! Dave ps: just tried on IE from a different computer, same problem :( pps: rebooted server, no help.

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• Monit wont start/stop any processes

  - by Vaughan Magnusson

  Hi, I've got monit running on a linux vserver, installed in a custom location /home/user/bin/monit as that is the only suitable location according to the webhost providers. When I installed monit I used ./configure --prefix=/home/user Monit itself runs, and sends me emails of it's activity, and the control file syntax is correct. However, monit cannot seem to start or stop anything - or even run the simplest of scripts. eg. Using 'monit stop all', I try to run the following stop command stop = "/bin/bash /home/user/simple_script.sh" Which fails (and says so in the log). I cant figure out why this is failing, can anyone help with this?

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• trap "" HUP v.s Nohup ? How can I run a portion of shell script in nohub mode?

  - by Alex

  I want to run a shell script over the weekend, but I wanna make sure if the terminal loses the connection, my script won't be terminated. I use nohup for the whole script invokation, but I also want to execute some portion of my shell script in a way that if someone closes my terminal, my script runs on the background still. Here is a simple example : #!/bin/bash echo "Start the trap" trap " " HUP echo "Sleeping for 60 Seconds" sleep 60 echo "I just woke up!" Please suggest what I should do ? The trap " " HUP seems like not working when I close my terminal tab.

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• "Half" ssh authorization to a server with git repository

  - by hsz

  Hello ! Currently I have purchased web hosting with ssh access. I have created a git repository on it and if I set my public key in ~/.ssh/authorized_keys file, I have access to that repo, I can push/pull data, etc. This solution allows access for every user that has his public key in authorized_keys file. But there is one thing that I want to avoid. Every user can login to the server too and has access to whole ssh account. Is it possible to create a blacklist of users' keys that will not have an access to ssh ? I see it that way: user logs in to a git - ok, allow for every one user logs in to ssh account ~/.profile file is hooked and called a custom script: check user's public key if public key is in ~/.ssh/blacklist_keys call bash exit/logout Is it possible in any way ?

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• How to execute programs on mounted partition

  - by DevNoob

  This is the aplication I want to run. -rwxr-xr-x 1 manuel manuel 582841 Nov 22 09:51 PromServerMain This is the fstab entry /dev/sda8 /media/data0 ext4 defaults,user 0 2 This is the mountpoint lrwxrwxrwx 1 manuel manuel 5 Nov 16 14:23 data -> data0 drwxrwxr-x 9 manuel manuel 4096 Nov 22 09:26 data0 This is what I get manuel@P5KC /media/data/Projekte/PromServer/src $ ./PromServerMain bash: ./PromServerMain: Keine Berechtigung manuel@P5KC /media/data/Projekte/PromServer/src $ sudo ./PromServerMain sudo: unable to execute ./PromServerMain: Permission denied Even as root. I have no clue whats wrong. Any suggestions? System is Debian Wheezy Xfce.

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• Configure Apache with a htaccess file to strip out unneeded respond-headers.

  - by Koning Baard XIV

  For ultimate speed, I want my Apache server strip unneeded headers from the response. Currently, the headers looks like this (excluding the status header): Connection:Keep-Alive Content-Length:200 Content-Type:text/html Date:Sat, 15 May 2010 16:28:37 GMT Keep-Alive:timeout=5, max=100 Server:Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8l DAV/2 PHP/5.3.1 Phusion_Passenger/2.2.7 X-Powered-By:PHP/5.3.1 Which I want to be like: Connection:Keep-Alive Content-Type:text/html Keep-Alive:timeout=5, max=100 How can I configure this in a .htaccess file? Thanks

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• Can VMWare Workstation 7.x and Sun VirtualBox 3.1.x co-exist on the same Windows 7 64bit Host togeth

  - by Heston T. Holtmann

  Will installing Sun Virtual Box bash or interfere with my VMWare installtion? I don't need to run VMs from both Virtual-Machine software packages at the same time but I do need to run some older Virtual-Machines from Sun-Virtualbox on the same 64-bit Windows 7 host until I can migrate those VMs to VMWare. Before switching from Linux host to Windows host, I ensured to export the VirtualBox VM to an OVF "appliance" with intentions of importing into VMWare Workstation 7. But VMWare gives me an error stating it can't import it. Background info My old workstation host: 32-bit Ubuntu 9.04 running Sun Virtual Box 3.x hosting Windows-XP VM Guest for Windows Software app development (VS2008, etc) Needs I need to get my original Sun-VBox Windows-XP Guest running on my new Windows 7 Workstation either imported into VMWare or running on the Windows version of Sun-Virtual box (I have the VM-Guest Backed up and copied to the new computer data drive. New workstation host: 64bit Windows 7 running VMWare Workstation 7 to host 32bit Ubuntu 9.10 for linux project work.

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• Using wget to save sequential files as well as renaming the file extension

  - by Ian

  I run a cron job that requests a snapshot from a remote webcam at a local address: wget http://user:[email protected]/snapshot.cgi This creates the files snapshot.cgi, snapshot.cgi.1, snapshot.cgi.2, each time it's run. My desired result would be for the file to be named similar to file.1.jpg, file.2.jpg. Basically, sequentially or date/time named files with the correct file extension instead of .cgi. Any ideas?

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• How to execute a shell script on startup?

  - by vijay.shad

  I have create a script to start a server(my first question). Now I want it to run on the system boot and start the defined server. What should I do to get this done? My findings tell me put this file in /etc/init.d location and it will execute when the system will boot. But I am not able to understand how the first argument on the startup will be start? Is this predefined somewhere to use start as $1? If I want to have a case startall that will start all the servers in the script, then what are the options I can manage. My Script is like this: #!/bin/bash case "$1" in start) start ;; stop) stop ;; restart) $0 stop $0 start ;; *) echo "usage: $0 (start|stop|restart)" ;; esac

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• Email arrived in SPAM no matter I do SPF, DKIM, and others stuffs

  - by Xjet

  During a full day I tried to removed my email from SPAM (in google). So I start from scratch by instaling Postfix on debian, setup SPF and DKIM. Email stay in spam but header are here. So I continue to set up DMARC. So far so good. Here is my last header : Delivered-To: h********[email protected] Received: by 10.224.84.20 with SMTP id h20csp148174qal; Tue, 3 Jun 2014 01:16:22 -0700 (PDT) X-Received: by 10.112.148.165 with SMTP id tt5mr6432900lbb.61.1401783381908; Tue, 03 Jun 2014 01:16:21 -0700 (PDT) Return-Path: <[email protected]> Received: from bcp.monconcours.com ([188.226.227.141]) by mx.google.com with ESMTP id ue3si38630125lbb.3.2014.06.03.01.16.21 for <h********[email protected]>; Tue, 03 Jun 2014 01:16:21 -0700 (PDT) Received-SPF: pass (google.com: domain of [email protected] designates 188.226.227.141 as permitted sender) client-ip=188.226.227.141; Authentication-Results: mx.google.com; spf=pass (google.com: domain of [email protected] designates 188.226.227.141 as permitted sender) [email protected]; dkim=pass [email protected]; dmarc=pass (p=NONE dis=NONE) header.from=bcp.monconcours.com Received: by bcp.monconcours.com (Postfix, from userid 33) id 9EA90614F2; Tue, 3 Jun 2014 08:16:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=monconcours.com; s=mail; t=1401783380; bh=IHAmfgk+Ge5iunMmbPMRKPHJrHsCmMebmJkS/G3zk7w=; h=To:Subject:From:To:Reply-To:Date; b=w/cIlRwSFhNS0TIKJj6yd2R3PeKDkkSf/ht2x4FV4l1jOlgsEwsXN8m4aJQMO0uCA hG4AOUgIGAlCoP5qrgLGtRYgjVbKXmHY0cjMxUvbVDKI0xymzSxzuPqoIXWD3COe+v +W57zmEFcq93pJvDUivJzgIWbYFy6SRWe495ups0= To: h*****[email protected] Subject: Creads.fr vous remercie de votre visite, Buissness Angel pour 3 million X-PHP-Originating-Script: 0:testmail.php From: "Banque BCP - Concours photo #teamportugal" <[email protected]> To: hu*****[email protected] Reply-To: "Banque BCP - Concours photo #teamportugal" <[email protected]> MIME-Version: 1.0 Content-Type: multipart/alternative;boundary=np538d84549a709 Content-Transfer-Encoding: 8bit Organization: Creads Digital X-Priority: 3 X-Mailer: PHP5.4.4-14+deb7u9 Message-Id: <[email protected]> Date: Tue, 3 Jun 2014 08:16:20 +0000 (UTC) This is a MIME encoded message. --np538d84549a709 Content-type: text/plain;charset=utf- I've also noticed a warn log for opendmarc : warning: connect to Milter service inet:127.0.0.1:8893: Connection refused But it seems that DMARC pass anyway... I've setup the correct DNS for DKIM and SPF, domain name or ip is not blacklisted. I've test on http://www.mail-tester.com/web-rMZjFj&reloaded=12 Most things seems ok but I can't fix the Reverse DNS issue (I don't have access to the main server). I begin to be pretty annoyed by the problem that's why I need expert advice/help.

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• OOM-Killer called every now and then..

  - by SpyrosP

  Hello there, i have a dedicated server where i've installed apache2, as well as Rails Passenger. Although i have 2GBs of RAM and most times about 1,5GB is free, there are some random times when i lose ssh and generic connectivity because oom-killer is killing processes. I suppose there is a memory leak but i cannot find out where it comes from. oom-killer kills apache2, mysql, passenger, whatever. Yesterday, i did a "cat syslog | grep -c oom-killer" and got 57 occurences ! It seems that something seriously destroys the memory. Once i reboot, everything comes back to normal. I suspect that it can be related to Passenger, but i'm still trying to figure it out. Can you think of anything else, or do you have anything to suggest that will make the leak identification procedure easier ? (i was even thinking of writing a bash script, to be run with cron for like every 5 minutes).

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• How does one launch PhpPgAdmin?

  - by DarenW

  I just installed postgresql, php5 and in particular PhpPgAdmin using Ubuntu's synaptic app. The PHP is running fine, the http server (lighttpd) is working fine, and I can do pg a the command line. The only thing that remains a mystery is PhpPgAdmin - just how does one fire it up to use it? I am clueless about the proper means of starting PhpPgAdmin; it isn't explained anywhere on the site for it. I tried typing phppgadmin at a bash command prompt, and entering "http://phppgsdmin/" and "http://localhost/phppgadmin" as wild guesses in the address bar in a browser - nothing happens. What is the secret? BTW, i'm only serving http on localhost, doing purely private web development.

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• Deletion of SQL Profiler Trace files (.trc)

  - by Mark

  We've noticed a lot of .trc files in our SQL data folder (\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data) on our server. The date range for these files spans over one day and the total file size of all files together is about 21 gigs. I'd like to free up this space but I'm not sure if I can just delete the files manually through Windows Explorer or if I need to do anything in SQL, like run a command or script. Any ideas?

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• FREEBSD creating new port

  - by su55

  Hi, I have a script here that I want to create as a port in freebsd and then make it as package so that I can install on some machines. script is below. !/usr/local/bin/bash if [ ! -f "/suid.old" ] then find / -perm -4000 -o -perm -2000 -ls /suid.old else find / -perm -4000 -o -perm -2000 -ls /suid.new diff suid.old suid.new newchanges fi exit 0 if [ -s "/newchanges" ] then mail -s "changes has occured" [email protected] else mail -s "No changes has occured" [email protected] /newchanges fi How can I accomplish this?

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• Excel: automatically update cell

  - by MickTaiwan

  Hello, I'd like to automatically update a Excel cell with the current date and time when another cell is changed (like a update timestamp). Do you have any pointer on how to do that ? Thanks, Mickael.

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