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• Using sed, how can I delete all blank lines?

  - by Steve

  Using sed, how can I delete all blank lines? Input file: Steve Blenheim:238-923-7366:95 Latham Lane, Easton, PA 83755:11/12/56:20300 Betty Boop:245-836-8357:635 Cutesy Lane, Hollywood, CA 91464:6/23/23:14500 Igor Chevsky:385-375-8395:3567 Populus Place, Caldwell, NJ 23875:6/18/68:23400 Norma Corder:397-857-2735:74 Pine Street, Dearborn, MI 23874:3/28/45:245500 Jennifer Cowan:548-834-2348:583 Laurel Ave., Kingsville, TX 83745:10/1/35:58900

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• Connect a ssd externally such that hdparm is fully supported

  - by student

  I am just trying some hdparm magic with my new ssd (samsung 840 pro). However I don't want to change my drive over and over so it would be great if I could connect it externally to my laptop. I have a cheap sata-usb Adapter, but I feel it doesn't support the ATA commands send by hdparm. So what's the best way to do this? Are there sata-usb Adapters which fully support the hdparm things? Would it be a good idea to buy a sata-esata adapter to get full control over the drive?

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• Escaping query strings with wget --mirror

  - by Jeremy Banks

  I'm using wget --mirror --html-extension --convert-links to mirror a site, but I end up with lots of filenames in the format post.php?id=#.html. When I try to view these in a browser it fails, because the browser ignores the query string when loading the file. Is there any way to replace the ? character in the filenames with something else? The answer of --restrict-file-names=windows worked correctly. In conjunction with the flags --convert-links and --adjust-extension/-E (formerly named --html-extension, which also works but is deprecated) it produces a mirror that behaves as expected. wget --mirror --adjust-extension --convert-links --restrict-file-names=windows http://www.example

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• Looking for a host based network monitor solution

  - by Ole Martin Handeland

  Hi all! Problem So, my hosting company has a network usage graph for my dedicated server. It seems that one day earlier this month, my network usage suddenly spiked with several hundred megabytes transferred (usually it's in the tens, not hundreds). It was probably me, but i just can't be sure who or what it was. Question So my question is; does anyone know of any host based solution for monitoring network usage that would tell me the client's IP-address, the port/service he/she used? What I don't want I'm just guessing that someone will suggest i use nagios, munin, zabbix, cacti, mrtg - I've also looked at those, but a graph over network usage will not give me the answers I'm looking for. :-) Almost there I've already looked at a lot of monitoring solutions, and I've tried [ntop][http://www.ntop.org/], [darkstat][http://unix4lyfe.org/darkstat/] and others. Darkstat just didn't give me the answers. Although it listed a lot of statistics, and i could list the clients - it doesn't show me the network usage for a particular period. Ntop is by far the best I've seen so far - but i think it mostly shows current network usage, not the historical part. I could run apt-get upgrade and download a whole bunch of software, but not see it in the log afterwards.

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• How to connect to Sametime server from Empathy IM or Pidgin?

  - by Danny

  Does anyone know how to connect to a Sametime server from Empathy IM or Pidgin? If yes, could you describe the steps you took in order to connect? I've tried creating an account in Empathy with the respective Sametime account and password information, but it continually fails to authenticate. Thanks.

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• How to stop syslog from listening to 514 on CentOS 5.8

  - by Jim

  I have a CentOS 5.8 machine (with regular syslog) that for some reason is listening to port 514, even though it is not started with "-r" (to receive remote syslog messages). # netstat -tulpn | grep 514 udp 0 0 0.0.0.0:514 0.0.0.0:* 2698/syslogd Syslog is started with only "-m 0": ps -ef | grep syslogd root 2698 1 0 15:55 ? 00:00:00 syslogd -m 0 I have tried starting it with "-m 0 -r", just to check if there was any difference, but there is not. This machine is a client and should only log to a central log server - it should not be listening itself. What am I missing?

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• needs updated glibc package version 3.4.15 or later for RHEL6

  - by Tejas

  I want to upgrade my current running applications to latest version. But due to some package issue i am unable to install them. I get common error in that: /usr/lib64/libstdc++.so.6: version 'GLIBCXX_3.4.15' not found. When i tried to update glibc package i get following output: [root@agastya ~]# yum install glibc Loaded plugins: refresh-packagekit, rhnplugin epel/metalink | 3.8 kB 00:00 epel | 4.3 kB 00:00 epel/primary_db | 5.0 MB 01:33 epel-testing/metalink | 3.8 kB 00:00 epel-testing | 4.3 kB 00:00 epel-testing/primary_db | 295 kB 00:03 rhel-x86_64-server-6 | 1.8 kB 00:00 rhel-x86_64-server-6/primary | 11 MB 02:02 rhel-x86_64-server-6 8816/8816 Setting up Install Process Package glibc-2.12-1.80.el6_3.6.x86_64 already installed and latest version Nothing to do [root@agastya ~]# Should i need to add some more repositories? If yes, how?

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• Recommended way to restrict Apache users

  - by Dor

  Following on why should we restrict Apache users, another two questions arises: What is the recommended method of restricting the places Apache users can traverse & read in the file system? What to do against fork bombs and other shell scripting problems? (bash scripting is allowed) My possible solutions (I prefer to know which solution you choose and why): chroot OR mod_chroot disable bash OR use Restricted BASH Please offer another solutions if you find appropriate. (perhaps selinux is?) Current status: Users are allowed to executed bash scripts (via PHP for example) suexec is active Apache requested are served with FastCGI for PHP

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• Caching different record types in dnsmasq

  - by viraptor

  I'm trying to use Dnsmasq as a local DNS cache. Unfortunately it seems it doesn't cache records other than A, AAAA, NS. For example MX, SRV, NAPTR are tried every time on the upstream server. Did I miss some configuration option? Is that by design?

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• How to run KDM or GDM over ssh

  - by Xolve

  I have a computer on LAN running ssh. I can normally tunnel the GUI application using ssh computer-name -X program-name But I wam my full desktop to be running on a remote computer using ssh so that I can just use that computer remotely like a local desktop. For this I think I will need to run KDM (or GDM ) remotely, what configuration do I need to do to make this happen?

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• Force gdm login screen to the primary monitor

  - by JIa3ep

  I have two monitors attached to my video card. Primary monitor has a resolution equal to 1280x1024 and second has 1920x1200. My gdm login screen always appears on the second monitor even if it is switched off. My question is how to force gdm to show login screen always on primary monitor with resolution 1280x1024? I use Ubuntu 10.04.

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• For enabling SSL for a single domain on a server with muliple vhosts, will this configuration work?

  - by user1322092

  I just purchased an SSL certificate to secure/enable only ONE domain on a server with multiple vhosts. I plan on configuring as shown below (non SNI). In addition, I still want to access phpMyAdmin, securely, via my server's IP address. Will the below configuration work? I have only one shot to get this working in production. Are there any redundant settings? ---apache ssl.conf file--- Listen 443 SSLCertificateFile /home/web/certs/domain1.public.crt SSLCertificateKeyFile /home/web/certs/domain1.private.key SSLCertificateChainFile /home/web/certs/domain1.intermediate.crt ---apache httpd.conf file---- ... DocumentRoot "/var/www/html" #currently exists ... NameVirtualHost *:443 #new - is this really needed if "Listen 443" is in ssl.conf??? ... #below vhost currently exists, the domain I wish t enable SSL) <VirtualHost *:80> ServerAdmin [email protected] ServerName domain1.com ServerAlias 173.XXX.XXX.XXX DocumentRoot /home/web/public_html/domain1.com/public </VirtualHost> #below vhost currently exists. <VirtualHost *:80> ServerName domain2.com ServerAlias www.domain2.com DocumentRoot /home/web/public_html/domain2.com/public </VirtualHost> #new -I plan on adding this vhost block to enable ssl for domain1.com! <VirtualHost *:443> ServerAdmin [email protected] ServerName www.domain1.com ServerAlias 173.203.127.20 SSLEngine on SSLProtocol all SSLCertificateFile /home/web/certs/domain1.public.crt SSLCertificateKeyFile /home/web/certs/domain1.private.key SSLCACertificateFile /home/web/certs/domain1.intermediate.crt DocumentRoot /home/web/public_html/domain1.com/public </VirtualHost> As previously mentioned, I want to be able to access phpmyadmin via "https://173.XXX.XXX.XXX/hiddenfolder/phpmyadmin" which is stored under "var/www/html/hiddenfolder"

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• Put Conky behind the desktop icons

  - by Michal Gow

  Maybe I am trying do something impossible, but after hours of Googling I didn't get 100% answer yet. So - it is possible put Conky on Desktop backgroud (behind desktop icons)? The usual config: own_window yes own_window_type normal # (desktop, override) - I have the same result for all this attributes own_window_transparent yes own_window_hints undecorated,below,skip_taskbar,sticky,skip_pager Is giving me Conky with (pseudo)transparent background in front of icons (they are completely hidden behind it, even if in background of Conky is shown background image), while I am trying achieve opposite... My system: SuSE 11.4 KDE 4.4 (Release 3) x86_64

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• How do I keep a bridge enabled on a bonded interface?

  - by jlawer

  I'm working on setting up a pair of CentOS 6.3 servers that will run a couple of KVM vms and have come across a problem setting up a bridge on a bond. I am using Mode 4 (802.3ad) bonding on a pair of stacked Dell Powerconnect 5524 switches connecting to R320 servers. There are 2 links (1 to each switch) that form a Link Aggregation Group (802.3ad / LACP bonding). On top of the bond I have VLAN Tagging. I've verified this is a problem on multiple other bonding modes so it isn't just a mode 4 issue. I am testing what happens when 1 link is dropped (ie switch dies, cable breaks, etc). If I don't have a bridge (for KVM), everything works fine, failover happens as expected. If I have the bridge enabled, it works fine until failover (unplugging a cable). When failover happens /var/log/messages shows the slave link going down, followed within a second by: kernel: br1: port 1(bond0.8) entering disabled state The thing is /proc/net/bonding/bond0 shows the link is up as expected (simply with only 1 slave instead of 2). If I plug the cable back in it recovers and brings the bridge back to an enabled state. I actually have tested this while a ping is occuring and if the timing is right a packet will actually leave the system after the link is lost, but before the disabled message occurs. This disabled state I assumed was STP, but I have disabled STP on the bridge configuration and this issue still occurs. brctl showstp br1 still shows the link as disabled when it is running without a slave. I also switched between the nics in the server (I have 2x Broadcom & 4x intel). It doesn't matter which configuration I have. Does anyone know of a way to force the bridge to stay enabled or why its detecting the bond as disabled, when it isn't?

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• Cant remove/delete symlink

  - by user477519

  I have tried to create a symlink and it threw this error: ln: accessing `.test': Permission denied Now I can't unlink or delete the symlink file. Tried Googling for help but could not find a solution. Please find the results of following commands. stat .test : File: `.test'stat: cannot read symbolic link `.test': Permission denied Size: 26 Blocks: 0 IO Block: 16384 symbolic link Device: 1fh/31d Inode: 312075453 Links: 1 Access: (0777/lrwxrwxrwx) Uid: (11160/ chatt) Gid: (11307/ pgr) Access: 2012-11-12 11:36:51.167327500 +0000 Modify: 2012-11-12 11:36:51.163331700 +0000 Change: 2012-11-12 11:36:51.163331700 +0000 Birth: - chattr -i .test: chattr: Permission denied while trying to stat .test lsatter .test lsattr: Operation not supported While reading flags on .test Any help would be appreciated. Thanks

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• How do I reference the value of a constructed environment variable in a loop?

  - by Rob Spieldenner

  What I'm trying to do is loop over environment variables. I have a number of installs that change and each install has 3 IPs to push files to and run scripts on, and I want to automate this as much as possible (so that I only have to modify a file that I'll source with the environment variables). The following is a simplified version that once I figure out I can solve my problem. So given in my.props: COUNT=2 A_0=foo B_0=bar A_1=fizz B_1=buzz I want to fill in the for loop in the following script #!/bin/bash . <path>/my.props for ((i=0; i < COUNT; i++)) do <script here> done So that I can get the values from the environment variables. Like the following(but that actually work): echo $A_$i $B_$i or A=A_$i B=B_$i echo $A $B returns foo bar then fizz buzz

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• CentOS send mail with external SMTP server and without local daemons

  - by Vilx-

  I've got a little old server with CentOS 6.5 on it. The hardware is old and crappy, but enough for what it has to do. Which consists of SSH (+SFTP), Apache, PHP and MySQL. Still, I'm trying to cut away all that I can. One thing that it does not need to do is to be an SMTP server. There are no mailboxes on it and nobody will ever route mail through it. However I do want it to send me an email when something goes wrong. Also, the webpages will send emails from PHP. So that brings me to the question - can I set up the mail system in such a way that there isn't an expensive mailer daemon sitting in the background with queues and whatnotelse, but rather every email is directly and immediately delivered to an external SMTP server? And how do I go about it?

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• How can I restrict SSH access when the source IP is dynamic

  - by Supratik

  Hi I want to protect SSH access to our live web server from all IP's except our office static IP. There are some employees who connects to this live server from their dynamic IP's. So, it is not always possible for me to change in the iptables rule in live server whenever the dynamic IP of the employee changes. I tried to put them in office VPN and allowed only SSH access from office IP but the office connection is slow in compared to our employee's private internet connection, moreover it adds an extra overhead to our office network. Is there any way I can solve this problem ?

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• What kernel modules are required for wi-fi to work?

  - by Leonid Shevtsov

  My custom-built 2.6.32 kernel cannot connect to any WPA-protected network. The kernel includes (probably?) everything that should be needed for wifi, including IPv4 network support (IPv6 is disabled), the ath5k wireless driver (which is used in the generic Ubuntu 2.6.31 kernel) and all crypto APIs. The card is being detected, however, iwlist scan returns wlan0 Failed to read scan data : Network is down and network-manager log says <info> (wlan0): driver supports SSID scans (scan_capa 0x01). <info> (wlan0): new 802.11 WiFi device (driver: 'ath5k') <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/1 <info> (wlan0): now managed <info> (wlan0): device state change: 1 -> 2 (reason 2) <info> (wlan0): bringing up device. <info> (wlan0): preparing device. <info> (wlan0): deactivating device (reason: 2). supplicant_interface_acquire: assertion `mgr_state == NM_SUPPLICANT_MANAGER_STATE_IDLE' failed <info> modem-manager is now available <WARN> default_adapter_cb(): bluez error getting default adapter: The name org.bluez was not provided by any .service files <info> Trying to start the supplicant... <info> (wlan0): supplicant manager state: down -> idle <info> (wlan0): device state change: 2 -> 3 (reason 0) <WARN> nm_supplicant_interface_add_cb(): Unexpected supplicant error getting interface: wpa_supplicant couldn't grab this interface. The exact same configuration works with the generic kernel. Is anything except wifi and crypto api needed for wi-fi to work?

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• Curl authentication

  - by Jack Humphries

  I am trying to download a file with cURL from a password protected directory on my site. It is not working. Instead of the downloading the requested file, it downloads a HTML file that says, "Authentication Required!" I'm not sure what the problem is. I've tried both of these (with the same result). The username and password are correct (and if the link below is used in a web browser, the file downloads successfully). 1) The username and password are included as part of the URL. curl https://username:[email protected]/auth/file.dmg --O /file.dmg; 2) The username and password are included as an option. curl -u username:wordpass.1 https://www.example.com/auth/file.dmg --O /file.dmg;

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• Wpa supplicant suddenly stopped working

  - by Grzenio

  Hi, Recently my wireless stopped working on my Debian testing system. It just doesn't connect. The best I get (only after a reboot) is that it says it did connect, but failed to get IP address. But usually it just tries to connect, disconnects straight away, connects again etc. so it never manages to associate correctly. I am sure it did work about a month ago, stopped working after recent upgrades from the repository. Any ideas how to find the issue and fix it?

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• Raspberry Pi can't see external hard drive

  - by user265818

  My Raspberry Pi (Model B) can't see my external hard drive. It was working before without a problem, until I disconnected and reconnected the drive. It is a self-powered hard drive. When I put another image on a different SD card the Raspberry Pi can see the hard drive no problem, so there is some sort of configuration issue in the current image on the SD card. Any advice will be gratefully received.

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• Monit network availability checking

  - by viraptor

  Hi, I'd like to start a service with monit but only when I have the correct ip bound to the host. Can this be done somehow with the normal config? For example I want to start a process xxx with pidfile xxx.pid, but only if host currently has 10.0.0.1 bound to some interface.

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• When and Where does Wubi mount it's virtual disks

  - by TuxPotato

  My use of the wubi-new-virtual-disk made Wubi start mounting this new virtual home disk over my /home folder. After the use of the script failed, I am left with Wubi constantly remounting an empty virtual disk over my /home folder. I followed the instructions on the Ubuntu website to revert the change, but the mounting continues. Where did Wubi put the mount operation, and how can I remove it? Thanks in advance!

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• dpkg: error processing /var/cache/apt/archives/python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--unpack)

  - by udo

  I had an issue (Question 199582) which was resolved. Unfortunately I am stuck at this point now. Running root@X100e:/var/cache/apt/archives# apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following NEW packages will be installed: file libexpat1 libmagic1 libreadline6 libsqlite3-0 mime-support python python-minimal python2.6 python2.6-minimal readline-common 0 upgraded, 11 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/5,204kB of archives. After this operation, 19.7MB of additional disk space will be used. Do you want to continue [Y/n]? Y (Reading database ... 6108 files and directories currently installed.) Unpacking python2.6-minimal (from .../python2.6-minimal_2.6.6-5ubuntu1_i386.deb) ... new installation of python2.6-minimal; /usr/lib/python2.6/site-packages is a directory which is expected a symlink to /usr/local/lib/python2.6/dist-packages. please find the package shipping files in /usr/lib/python2.6/site-packages and file a bug report to ship these in /usr/lib/python2.6/dist-packages instead aborting installation of python2.6-minimal dpkg: error processing /var/cache/apt/archives/python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--unpack): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: /var/cache/apt/archives/python2.6-minimal_2.6.6-5ubuntu1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) results in above error. Running root@X100e:/var/cache/apt/archives# dpkg -i python2.6-minimal_2.6.6-5ubuntu1_i386.deb (Reading database ... 6108 files and directories currently installed.) Unpacking python2.6-minimal (from python2.6-minimal_2.6.6-5ubuntu1_i386.deb) ... new installation of python2.6-minimal; /usr/lib/python2.6/site-packages is a directory which is expected a symlink to /usr/local/lib/python2.6/dist-packages. please find the package shipping files in /usr/lib/python2.6/site-packages and file a bug report to ship these in /usr/lib/python2.6/dist-packages instead aborting installation of python2.6-minimal dpkg: error processing python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--install): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: python2.6-minimal_2.6.6-5ubuntu1_i386.deb results in above error. Running root@X100e:/var/cache/apt/archives# dpkg -i --force-depends python2.6-minimal_2.6.6-5ubuntu1_i386.deb (Reading database ... 6108 files and directories currently installed.) Unpacking python2.6-minimal (from python2.6-minimal_2.6.6-5ubuntu1_i386.deb) ... new installation of python2.6-minimal; /usr/lib/python2.6/site-packages is a directory which is expected a symlink to /usr/local/lib/python2.6/dist-packages. please find the package shipping files in /usr/lib/python2.6/site-packages and file a bug report to ship these in /usr/lib/python2.6/dist-packages instead aborting installation of python2.6-minimal dpkg: error processing python2.6-minimal_2.6.6-5ubuntu1_i386.deb (--install): subprocess new pre-installation script returned error exit status 1 Errors were encountered while processing: python2.6-minimal_2.6.6-5ubuntu1_i386.deb is not able to fix this. Any clues how to fix this?

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