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• Automatically wake up notebooks not on the ethernet

  - by gletscher

  I am looking for an automated backup system and I like bacula. I have 3 Notebooks and a Desktop computer that need regular backup. Now I don't want to let them run all night just to do the backuping, so I was thinking I could use wake-on-lan to have bacula wake up the machines, then do the backups, and shut them down afterswards. While this may work with devices on the ethernet, it won't work with the Notebooks on the wifi. So is it possible to have the Notebooks schedules to automatically wake up from suspend or shutdown ? Or is it possible to interject a shutdown command if it is after a certain hour and call the bacula director to start the backup now? I'm new to controlling the linux system using scripts, so any hints on how and where to start are greatly appreciated. Thanks alot for your help, input and ideas.

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• Why does changing the physical socket on your router cause delays?

  - by Josh Browning

  My question involves the delays involved with changing which physical socket your ethernet cable is connected to. I am aware that if you are connected to a router on a network and then change which physical socket on that router you are using you will gain very small additional delays initially. However I am curious as to what causes these delays. I originally thought it was to do with the infromation stored in the routing table and whether that was allocated to a specific socket on the router or not. Although, if your IP address is the same then I don't understand why there would be delays because I would of assumed that any information within the router was linked to an IP address rather than a physical socket.

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• bash starts replacing the characters on the current line insead of moving over to the next line

  - by Lazer

  I use bash shell $ bash --version GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu) Copyright (C) 2005 Free Software Foundation, Inc. $ Sometimes, when typing a command on the prompt that is pretty lengthy and does not fit in the current line, instead of displaying the extra characters on the next line, bash starts again on the current line.. replacing the characters that were there and making a mess. what should happen : |---------------------------------------------| | $ my big long command takes a lot of argumen| | s and does not fit in a single line | | | |---------------------------------------------| what happens instead : |---------------------------------------------| | s and does not fit in a single linef argumen| | | | | |---------------------------------------------| The issue is intemittent If I resize my shell window to really small width, normal behaviour is restored Does anyone have any idea what is happening here? $ echo $TERM xterm $ echo $PS1 \[\e[30m\][\t]\[\e[0m\]\[\e]0;\w\a\]\[\e[30m\][\W]$ $

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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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• Write STDOUT & STDERR to a logfile, also write STDERR to screen

  - by Stefan Lasiewski

  I would like to run several commands, and capture all output to a logfile. I also want to print any errors to the screen (or optionally mail the output to someone). Here's an example. The following command will run three commands, and will write all output (STDOUT and STDERR) into a single logfile. { command1 && command2 && command3 ; } > logfile.log 2>&1 Here is what I want to do with the output of these commands: STDERR and STDOUT for all commands goes to a logfile, in case I need it later--- I usually won't look in here unless there are problems. Print STDERR to the screen (or optionally, pipe to /bin/mail), so that any error stands out and doesn't get ignored. It would be nice if the return codes were still usable, so that I could do some error handling. Maybe I want to send email if there was an error, like this: { command1 && command2 && command3 ; } logfile.log 2&1 || mailx -s "There was an error" [email protected] The problem I run into is that STDERR loses context during I/O redirection. A '2&1' will convert STDERR into STDOUT, and therefore I cannot view errors if I do 2 error.log Here are a couple juicier examples. Let's pretend that I am running some familiar build commands, but I don't want the entire build to stop just because of one error so I use the '--keep-going' flag. { ./configure && make --keep-going && make install ; } > build.log 2>&1 Or, here's a simple (And perhaps sloppy) build and deploy script, which will keep going in the event of an error. { ./configure && make --keep-going && make install && rsync -av --keep-going /foo devhost:/foo} > build-and-deploy.log 2>&1 I think what I want involves some sort of Bash I/O Redirection, but I can't figure this out.

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• how to set the font with mailx?

  - by Bob

  Solaris Korn Shell I am writing sql reports to an oracle database, spooling them to a file and emailing them with mailx. I use the syntax below. The reports do not format properly, unless I use the Courier New font. How do I set this with mailx? mailx -s "MY REPORT, date +'%D %r " -r "REPORTING SYSTEM" [email protected]< /mydir/mysql.log /dev/null

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• How do I connect to the serial console port os a Sunfire 280R?

  - by DrStalker

  We have a Sunfire 280R (old SPARC/Solaris server) that is refusing to come up after being relocated. We're trying to connect to the serial console port, but all we get is random gibberish on the screen. We've tried both connecting with a DB25DB9 adapter and using a DB-25-RJ45 adapter with a cisco RJ45-DB9 adapter to a windows laptop. We're configuring the laptop to 9600 baud, 8 bit, 1 stop bit, no parity. We've tried both no flow control and Xon/Xoff. We get the same results hooking up to the serial port on a working SPARC server, so it's probably something in our setup rather than a fault with the server. How do we get access to to serial console so we can work out what is stopping this box from getting to the network? Is there a special sun adapter we need to get/make to get the serial link working?

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• Break all hardlinks within a folder

  - by Georges Dupéron

  I have a folder which contains a certain number of files which have hard links (in the same folder or somewhere else), and I want to de-hardlink these files, so they become independant, and changes to their contents won't affect any other file (their link count becomes 1). Below, I give a solution which basically copies each hard link to another location, then move it back in place. However this method seems rather crude and error-prone, so I'd like to know if there is some command which will de-hardlink a file for me. Crude answer : Find files which have hard links (Edit: To also find sockets, etc. that have hardlinks, use find -not -type d -links +1) : find -type f -links +1 A crude method to de-hardlink a file (copy it to another location, and move it back) : Edit: As Celada said, it's best to do a cp -p below, to avoid loosing timestamps and permissions. Edit: Create a temporary directory and copy to a file under it, instead of overwriting a temp file, it minimizes the risk to overwrite some data, though the mv command is still risky (thanks @Tobu). # This is unhardlink.sh set -e for i in "$@"; do temp="$(mktemp -d ./hardlnk-XXXXXXXX)" [ -e "$temp" ] && cp -ip "$i" "$temp/tempcopy" && mv "$temp/tempcopy" "$i" && rmdir "$temp" done So, to un-hardlink all hard links (Edit: changed -type f to -not -type d, see above) : find -not -type d -links +1 -print0 | xargs -0 unhardlink.sh

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• *Simple* way to block DDoS by number of requests

  - by Eduard Luca

  I have 3 Varnish 3.0.2 servers with Apache 2 as backends, which are being load balanced through a HAproxy separate server. I need to find a very simple program (I'm not much of a sysadmin), which blocks requests from an IP, if that IP has made more than X requests in Y seconds. Would something like this be achievable with a simple solution? Right now I have to block all requests manually with iptables.

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• Specify default group and permissions for new files in a certain directory

  - by mislav

  I have a certain directory in which there is a project shared by multiple users. These users use SSH to gain access to this directory and modify/create files. This project should only be writeable to a certain group of users: lets call it "mygroup". During an SSH session, all files/directories created by the current user should by default be owned by group "mygroup" and have group-writeable permissions. I can solve the permissions problem with umask: $ cd project $ umask 002 $ touch test.txt File "test.txt" is now group-writeable, but still belongs to my default group ("mislav", same as my username) and not to "mygroup". I can chgrp recursively to set the desired group, but I wanted to know is there a way to set some group implicitly like umask changes default permissions during a session. This specific directory is a shared git repo with a working copy and I want git checkout and git reset operations to set the correct mask and group for new files created in the working copy. The OS is Ubuntu Linux. Update: a colleague suggests I should look into getfacl/setfacl of POSIX ACL but the solution below combined with umask 002 in the current session is good enough for me and is much more simple.

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• Why /home folder is missing from my backup archive created by tar?

  - by Konstantin Pereyaslov

  So I'm doing full backup of my VPS using the following command (as root, of course): tar czvf 20120604.tar.gz / Everything seems to be fine, all files seem to appear in the list. The size of archive is 6 Gb and gunzipped version is 11 Gb which includes /home, because I totally have 11 Gb of data on VPS. But when I try actually to unpack archive, or open it using mc or WinRAR, there's no /home folder. And WinRAR tells 20120604.tar.gz - TAR+GZIP archive, unpacked size 894 841 346 bytes. It can't be WinRAR's bug, because when I type tar xzvf 20120604.tar.gz, /home folder isn't unpacked either. Why is /home folder missing from my archive? And what can I do to include it there? tar --version outputs the following: tar (GNU tar) 1.15.1

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• Getting syntax highlighting in shell and emacs via Terminal.app on mac os x

  - by user248237

  How could I enable syntax highlighting on the shell and in emacs when I use Terminal.app on Mac OS X to ssh into other machines? Right now if I ssh and do an "ls" for example, directories are not shown in a different color from flat files, for example, and I'd like to fix that. thanks.

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• Mac OS X: at command not working

  - by David.Chu.ca

  I am going to schedule a job by using at command. Here I tried the following command: $ at now + 1 minute echo 'Test at command' <EOD> I saw the job is scheduled by using at -l. However, I saw no echo out. I guess that I may need to add user to at.allow file. I cannot find at.allow in my Mac (Snow Leopard). Not sure what I need to do to test this at command?

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• What is the difference between bash and sh

  - by Saif Bechan

  In using i see 2 types of code #!/usr/bin/sh and #!/user/bin/bash I have Googled this and the opinions vary a lot. The explanation I have seen on most websites is that sh is older than bash, and that there is no real difference. Does someone know the difference between these and can give a practical example when to use either one of them. I highly doubt that there is no real difference, because then having to things that do the exact same thing would be just

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• Use Apache authentication to Segregate access to Subversion subdirectories

  - by Stefan Lasiewski

  I've inherited a Subversion repository, running on FreeBSD and using Apache2.2 . Currently, we have one project, which looks like this. We use both local files and LDAP for authentication. <Location /> DAV svn SVNParentPath /var/svn AuthName "Staff only" AuthType Basic # Authentication through Local file (mod_authn_file), then LDAP (mod_authnz_ldap) AuthBasicProvider file ldap # Allow some automated programs to check content into the repo # mod_authn_file AuthUserFile /usr/local/etc/apache22/htpasswd Require user robotA robotB # Allow any staff to access the repo # mod_authnz_ldap Require ldap-group cn=staff,ou=PosixGroup,ou=foo,ou=Host,o=ldapsvc,dc=example,dc=com </Location> We would like to allow customers to access to certain subdirectories, without giving them global access to the entire repository. We would prefer to do this without migrating these sub-directories to their own repositories. Staff also need access to these subdirectories. Here's what I tried: <Location /www.customerA.com> DAV svn SVNParentPath /var/svn # mod_authn_file AuthType Basic AuthBasicProvider file AuthUserFile /usr/local/etc/apache22/htpasswd-customerA Require user customerA </Location> <Location /www.customerB.com> DAV svn SVNParentPath /var/svn # mod_authn_file AuthType Basic AuthBasicProvider file AuthUserFile /usr/local/etc/apache22/htpasswd-customerB Require user customerB </Location> I've tried the above. Access to '/' works for staff. However, access to /www.customerA.com and /www.customerB.com does not work. It looks like Apache is trying to authenticate the 'customerB' against LDAP, and doesn't try local password file. The error is: [Mon May 03 15:27:45 2010] [warn] [client 192.168.8.13] [1595] auth_ldap authenticate: user stefantest authentication failed; URI /www.customerB.com [User not found][No such object] [Mon May 03 15:27:45 2010] [error] [client 192.168.8.13] user stefantest not found: /www.customerB.com What am I missing?

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• Safely get rid of "You have new mail in /var/mail" on a Mac?

  - by viatropos

  I was messing around with sendmail in Rails a year ago and have had this message popping up in the terminal after every command ever since: You have new mail in /var/mail/Lance How do I properly get rid of that so the message goes away? I ever use any of that functionality and don't have mail on my computer. There's one file in /var/mail called lance, and it's huge. Can I just remove it?

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• How can I fix puppet refusing to start and asking for "master.pp"?

  - by cwd

  I'm using the very latest version of puppet and have been following the Apress "Pro Puppet" guide step by step. I have installed puppet sudo aptitude install ruby libshadow-ruby1.8 sudo aptitude install puppet puppetmaster facter I have edited /etc/puppet/puppet.conf to include certname [master] certname=puppet.mydomain.com I have edited /etc/hosts and added the following line 127.0.0.1 puppet.mydomain.com puppet I have set the hostname of the server echo "puppet.mydomain.com" > /etc/hostname hostname -F /etc/hostname And then I try and run puppet from the command line. puppet master --verbose --no-daemonize And puppet gives me this error: Could not parse for environment production: Could not find file /master.pp I'm running all commands with sudo and the last line of the error message always says that it can't find master.pp and the path before it is to my current working directory. What am I doing wrong? I should also mention that I don't have a DNS record set up for puppet.mydomain.com - I saw some online documentation mentioning this might be a problem - however I was fairly sure that the hosts file would let me get around that.

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• init never reaping zombie/defunct processes

  - by st9

  Hi, On my Fedora Core 9 webserver with kernel 2.6.18.8, init isn't reaping zombie processes. This would be bearable if it wasn't for the process table eventually reaching an upper limit where no new processes can be allocated. Sample output of ps -el | grep 'Z': F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 5 Z 0 2648 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 1 Z 51 2656 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 1 Z 0 2670 1 0 75 0 - 0 exit ? 00:00:02 crond <defunct> 4 Z 0 2874 1 0 82 0 - 0 exit ? 00:00:00 mysqld_safe <defunct> 5 Z 0 28104 1 0 76 0 - 0 exit ? 00:00:00 httpd <defunct> 5 Z 0 28716 1 0 76 0 - 0 exit ? 00:00:06 lfd <defunct> 5 Z 74 10172 1 0 75 0 - 0 exit ? 00:00:00 sshd <defunct> 5 Z 0 11199 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11202 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11205 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11208 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11211 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11240 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11246 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11249 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 5 Z 0 11252 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> 1 Z 0 14106 1 0 80 0 - 0 exit ? 00:00:00 anacron <defunct> 5 Z 0 14631 1 0 75 0 - 0 exit ? 00:00:00 sendmail <defunct> Is this an OS bug? misconfiguration? I'm looking for inspiration as to the source of this problem. Thanks

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• Compiling PHP with GD and libjpeg support

  - by Robin Winslow

  I compile my own PHP, partly to learn more about how PHP is put together, and partly because I'm always finding I need modules that aren't available by default, and this way I have control over that. My problem is that I can't get JPEG support in PHP. Using CentOS 5.6. Here are my configuration options when compiling PHP 5.3.8: './configure' '--enable-fpm' '--enable-mbstring' '--with-mysql' '--with-mysqli' '--with-gd' '--with-curl' '--with-mcrypt' '--with-zlib' '--with-pear' '--with-gmp' '--with-xsl' '--enable-zip' '--disable-fileinfo' '--with-jpeg-dir=/usr/lib/' The ./configure output says: checking for GD support... yes checking for the location of libjpeg... no checking for the location of libpng... no checking for the location of libXpm... no And then we can see that GD is installed, but that JPEG support isn't there: # php -r 'print_r(gd_info());' Array ( [GD Version] => bundled (2.0.34 compatible) [FreeType Support] => [T1Lib Support] => [GIF Read Support] => 1 [GIF Create Support] => 1 [JPEG Support] => [PNG Support] => 1 [WBMP Support] => 1 [XPM Support] => [XBM Support] => 1 [JIS-mapped Japanese Font Support] => ) I know that PHP needs to be able to find libjpeg, and it obviously can't find a version it's happy with. I would have thought /usr/lib/libjpeg.so or /usr/lib/libjpeg.so.62 would be what it needs, but I supplied it with the correct lib directory (--with-jpeg-dir=/usr/lib/) and it doesn't pick them up so I guess they can't be the right versions. rpm says libjpeg is installed. Should I yum remove and reinstall it, and all it's dependent packages? Might that fix the problem? Here's a paste bin with a collection of hopefully useful system information: http://pastebin.com/ied0kPR6

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• Can files deleted with rm -rf be recovered?

  - by Lena

  When I delete folders or files in through osx terminal using the rm -rf, where do they go? I heard that some say they are deleted directly, but some also say it only "remove the link to the file making it unable to be found or accessed without special tools" (http://superuser.com/questions/370786/where-do-files-and-directories-go-when-i-run-rm-rf-folder-or-file-name-in-ubu). Someone said something about ext3 being able to save rm-ed files in ubuntu but what about mac?

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• Calculate disk space occupied by many .png files

  - by Alexander Farber

  I have 357 .png files located in different sub dirs of the current dir: settings# find . -name \*.png |wc -l 357 settings# find . -name \*.png | head ./assets/authenticationIcons/audio.png ./assets/authenticationIcons/bbid.png ./assets/authenticationIcons/camera.png ./bin/icons/ca_video_chat.png ./bin/icons/ca_voice_control.png ./bin/icons/ca_vpn.png ./bin/icons/ca_wifi.png Is there a oneliner to calculate the total disk space occupied by them (before I pngcrush them)? I've tried (unsuccessfully): settings# find . -name \*.png | xargs du -s 4 ./assets/support/wifi_locked_icon_white.png 1 ./assets/support/wifi_vpn_icon_connected.png 1 ./assets/support/wi_fi.png 1 ./assets/support/wi_fi_conected.png 8 ./bin/blackberry-tablet-icon.png 2 ./bin/icons/ca_about.png 2 ./bin/icons/ca_accessibility.png 2 ./bin/icons/ca_accounts.png 2 ./bin/icons/ca_airplane_mode.png 2 ./bin/icons/ca_application_permissions.png 1 ./bin/icons/ca_balance.png

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• Use sed command to replace , appearing between numbers

  - by Saurabh

  I have a CSV file where data are in the following format |001|,|abc,def|,123456,789,|aaa|,|bbb|,444,555,666 I want to replace only those "," that appears between numbers with some other character like say SOH or $ or * other "," appearing in the line should not get replaced i.e. to say I wish to have following output |001|,|abc,def|,123456*789,|aaa|,|bbb|,444*555*666 Can someone please help me with sed command pattern to get the above desired output

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• How to keep program running after ssh disconnection.

  - by Max

  Hi! I want to run program from my notebook by ssh-connection to remote server. The problem is I am going home with my note :) How to keep programm running?

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• What happens to running processes when I lose a remote connection to a *nix box?

  - by David Marble

  I occasionally lose my remote SSH connection to my VPS. I use screen for long-running processes, but am wondering what happens to the processes I had running aside from those run within a screen session if I lose the connection to the box. When I re-establish a connection to the box, what happened to the bash and sshd processes that were running when I lost the connection? Today I lost connection repeatedly and noticed many more bash and sshd processes than usual. If there are processes hanging around, do I need to kill them? How could I determine which processes were abandoned from my previous session? Thanks for any replies!

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• How to index filenames, size and basic informations for every file on a network?

  - by Antoine

  I have several machines, most of then are Linux and one of them is under Mac OS X. Each machine has several internal hard drives, and I also have a few external hard drives. How can I reliably find files with setup ? External drives are not always plugged, but the files don't move often. Ideally I would like to be able to search the metadata given with the 'file' command, and move files over the network.

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