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• download file from web source, selectively

  - by KILL3RTACO

  If anyone has heard of Bukkit, you know that their files are usually of three types: Development, Beta, and Realease. Click (here) for examples. I need a script that: Loops through the directory Gets the latest Stable version (probably just as simple as looking at the version number as they have a simple naming convention, each stable version is succeeded by -Rx.0, while developmental and beta versions are succeeded by -Rx.x) After that I know I'll need to use wget to download the file. Note: If your just going to post code, at least tell me what it does so I can use it later if I need to

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• Preventing Users/Groups from accessing certain Domains

  - by ncphillips

  I have created a Study account which I use when doing anything school related work. It's purpose is to remove the distractions of my normal account, such as social media and news websites. I know /etc/hosts can be edited to block certain domains from being accessed, but this is for all Users, and I don't want to have to switch in and out of Admin to change it every time I want to focus. Is there any way to block these domains for specific Users or Groups?

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• find grep pipe and ampersand

  - by HKK

  I am using cygwin to find a file on the cygdrive. However I need to suppress the permission denied messages (otherwise the results get hidden in the error messages). The following command works: find -name 'myfile.*' |& grep -v "Permission denied" I don't understand why the ampersand needs to be put into this command, would have expected this to work but it doesn't. find -name 'myfile.*' | grep -v "Permission denied" Please explain the meaning of the ampersand.

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• How to save terminal history manually?

  - by wim

  It's my understanding that the history file is updated when the terminal exits. But sometimes my computer crashes out, and the terminal doesn't exit cleanly, and then I lose those commands from my history which is annoying. How can I make it flush immediately, so that the entries still go there even if my computer has a meltdown? At the moment I'm using this workaround, but I feel there should be a better way. I'm using gnome-terminal on Ubuntu 12.10.

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• How to pass results of bc to a variable

  - by shaolin

  I'm writing a script and I would like to pass the results from bc into a variable. I've declared 2 variables (var1 and var2) and have given them values. In my script I want to pass the results from bc into another variable say var3 so that I can work with var3 for other calculations. So far I have been able write the result to a file which is not what I'm looking for and also I've been able to echo the result in the terminal but I just want to pass the result to a variable at moment so that I can work with that variable. echo "scale=2;$var1/var2" | bc

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• How do I change my PYTHONPATH to make 3,2 my default Python instead of 2.7.2?

  - by max

  I have python3.2 located in /usr/lib/python3.2. I am not sure if that means it's installed but I assume it is for now. Some facts about my system: $ which python /usr/local/bin/python When I type python in terminal I get the following $ python Python 2.7.2 (default, Dec 19 2011, 11:12:13) [GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. Then to find the path I do >>> sys.info >>> sys.path ['', '/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg', '/usr/local/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg', '/usr/local/lib/python2.7/site-packages/PIL-1.1.7-py2.7-linux-x86_64.egg', '/usr/local/lib/python27.zip', '/usr/local/lib/python2.7', '/usr/local/lib/python2.7/plat-linux2', '/usr/local/lib/python2.7/lib-tk', '/usr/local/lib/python2.7/lib-old', '/usr/local/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/site-packages'] So knowing all of this, how do I change my default system python from 2.7.2 to 3.2?

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• How to move only a specific amount of images from a folder

  - by Luis Alvarado

  I have a folder that has 200.000 images. I want to do the following: Move an X amount of images (50 images, 100 images, 200 images) from that folder to Y folder. Each Y folder can be a number (Folder 1, Folder 2, Folder 3...). The end result might look like this: Folder 1 (Has X amount of images) Folder 2 (Has X amount of images) Folder 3 (Has X amount of images) Folder 4 (Has X amount of images)

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• Creating basic ACPI event makes the system unusably slow

  - by skerit

  I want to change a few settings on my laptop when I switch to battery power. I created a new event in /etc/acpi/events/cust-battery and it looks like this: event=battery action=/home/skerit/power.sh I put a simple command in the power.sh file: echo This is a test >> /home/skerit/powertest Now, when I tail this file it shows "This is a test" 4-5 times upon switching to battery power. However, the system becomes totally unstable. It slows down significantly. I can't change anything in the terminal. The terminal and certain parts of the screen (like the gnome system monitor applet) go blank from time to time. What can be the cause of that? It's a simple echo that gets executed a few times!

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• Command to determine whether a fullscreen application is running?

  - by George Edison

  I have a small shell script that plays a little jingle and displays a notification whenever I get a new email. The problem is that this shell script can get invoked anytime - including when I'm watching a DVD / video in fullscreen mode with the sound turned up quite a bit - which is quite annoying. I'd like to enhance this script with the ability to detect whether an application is in fullscreen mode. I know this must be somehow possible because notifications don't display under those circumstances. What command can I use?

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• Chef bash resource not executing as specified user

  - by Arthur Maltson

  I'm writing a Chef cookbook to install Hubot. In the recipe, I do the following: bash "install hubot" do user hubot_user group hubot_group cwd install_dir code <<-EOH wget https://github.com/downloads/github/hubot/hubot-#{node['hubot']['version']}.tar.gz && \ tar xzvf hubot-#{node['hubot']['version']}.tar.gz && \ cd hubot && \ npm install EOH end However, when I try to run chef-client on the server installing the cookbook, I'm getting a permission denied writing to the directory of the user that runs chef-client, not the hubot user. For some reason, npm is trying to run under the wrong user, not the user specified in the bash resource. I am able to run sudo su - hubot -c "npm install /usr/local/hubot/hubot" manually, and this gets the result I want (installs hubot as the hubot user). However, it seems chef-client isn't executing the command as the hubot user. Below you'll find the chef-client execution. Thank you in advance. Saving to: `hubot-2.1.0.tar.gz' 0K ...... 100% 563K=0.01s 2012-01-23 12:32:55 (563 KB/s) - `hubot-2.1.0.tar.gz' saved [7115/7115] npm ERR! Could not create /home/<user-chef-client-uses>/.npm/log/1.2.0/package.tgz npm ERR! Failed creating the tarball. npm ERR! couldn't pack /tmp/npm-1327339976597/1327339976597-0.13104878342710435/contents/package to /home/<user-chef-client-uses>/.npm/log/1.2.0/package.tgz npm ERR! error installing [email protected] Error: EACCES, permission denied '/home/<user-chef-client-uses>/.npm/log' ... npm not ok ---- End output of "bash" "/tmp/chef-script20120123-25024-u9nps2-0" ---- Ran "bash" "/tmp/chef-script20120123-25024-u9nps2-0" returned 1

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• Why isn't .profile sourced on login to LXDE?

  - by papukaija

  I switched recently from GNOME to LXDE and since then my .profile file hasn't been sourced on login. I found out that my PATH variable doesn't include ~/bin anymore. However, my .profile file includes PATH="$HOME/bin:$PATH" while PATH's content is /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games. Is it intended that LXDE doesn't read this file on login? If yes, what file should I use to add the bin folder to the PATH variable? If not, to what package should I report a bug?

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• Converting Celsius Processor Temperature to Fahrenheit

  - by WindowsEscapist

  I'm editing a Conky theme. I would like it to output the processor temperatures in degrees Fahrenheit instead of Celsius. In the ~/.conkyrc file, the command sensors | grep 'Core 0' | cut -c18-19 is used to find the temperature in Celsius for the first processor core. I want to use bc to compute this (give it outputvalue*9/5+32). Problem is, bc wants just absolute values, and I see no way to pass it program output. If I try to use something like temp=$(sensors | grep 'Core 0' | cut -c18-19) & echo 'temp*9/5+32' | bc, it ends up giving me 32 because it registers "temp" as a 0.

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• Attempting to GREP details of a Java error

  - by BOMEz

  I'm running Ubuntu 11 and I'm having some issues with grep. I have a shell script (see below) which essentially checks if a certain Java program of mine is running, if not it runs it. That part works out great! If my Java application throws any kind of exception however I would like to capture that information and email it to myself. How can I go about checking to see if the call to java -jar /bin/MyApp.jar fails? I tried piping it to grep, but that doesn't seem to work. Below is the full script that I've written: #Check if MyApp.jar is running, if not run it. if [ $(ps aux | grep 'java' | grep -v grep | wc -l | tr -s "\n") -eq 0 ] then echo "PacketCapture Starting...\n" java -jar /bin/MyApp.jar echo "PacketCapture Started.\n" else echo "PacketCapture already running.\n" fi

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• How do I select a field/column from the output of `ls -l`?

  - by soandos

  My goal is deceptively simple (at least to me). I wish to take the output of ls -l or ls -lh and select just one field. I am looking for this to be as bulletproof as possible, by which I mean, assume that filenames can have a variable number of spaces, not everything in the field has the same length, etc. Bonus points for having a script that will take the name of the the field (or even just a field number), and then return the contents of the field. I want to turn into:

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• How do I include a password with SSH command? (want to make shell script)

  - by Evan

  I'm trying to SSH to a server on startup with a .sh script, but that will require me to enter the password for the account on the server that I'm SSHing to. I did some RTFMing, and I see in "-o" that it has "PasswordAuthentication" but I'm not sure how or if I could use that option. As this will be in a shell script, obviously I'd like to have the password in that file, or in any case not have to enter in the password manually every time the script runs.

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• Logging every time a command is run

  - by Tom D

  I want to log every time I run a certain type of command in the terminal. For example, every time I run: sudo apt-get install [something] I want to add [something] to a log file in my home directory that will look like the following: [timestamp] [something] 2012-10-02 mysql-server 2012-10-03 ruby1.9.1 2012-10-06 gedit-plugins 2012-10-07 gnome-panel synaptic What's the easiest way to make this happen automatically?

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• How to xkill an application by its id?

  - by Hanynowsky

  I need to simulate the behavior of the keyboard shortcut (ALT+F4) using Terminal for a given application. If I open for example gedit and click ALT + F4 , then GEDIT will be xkilled. If I want to achieve same thing using Terminal, how should I proceed? The command export PIDTOKILL=pidof gedit | grep [^*]; xkill -id $PIDTOKILL does not work and gives the following error: xkill: killing creator of resource 0x3f38 X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 113 (X_KillClient) Value in failed request: 0x3f38 Serial number of failed request: 8 Current serial number in output stream: 9 I think I am confusing application id and process id here

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• Problem manipulating text using grep

  - by moata_u

  I want to search for a line that contains log4j and take 7 lines before and 3 lines after the match. grep -B7 -A3 "log4j" web.xml After that I want to add comment tags before this paragraph and after it. <!-- paragraph that i found by grep --> I wrote this script bellow: search=`find . -name 'web.xml'` text=`grep -B7 -A3 "log4j" $search` sed -i "/$text/c $newparagraph" $search It's not working. Is there any way to just add comment symbol not replace the paragraph? What I want to the script to do: search for the paragraph append append -- at the end Edit: This is the paragraph that am trying manipulate : <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/log4j.properties</param-value> </context-param> <listener> <listenerclass> org.springframework.web.util.Log4jConfigListener </listener-class> </listener> This paragraph is part of many paragraphs! I want make it like this: <!-- <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/classes/log4j.properties</param-value> </context-param> <listener> <listenerclass> org.springframework.web.util.Log4jConfigListener </listener-class> </listener> -->

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• Why ~/.bash_profile is not getting sourced when opening a terminal in Ubuntu 11.04?

  - by Viriato

  Problem I have an Ubuntu 11.04 Virtual Machine and I wanted to set up my Java development environment. I did as follows sudo apt-get install openjdk-6-jdk Added the following entries to ~/.bash_profile export JAVA_HOME=/usr/lib/jvm/java-6-openjdk export PATH=$PATH:$JAVA_HOME/bin Save the changes and exit Open up a terminal again and typed the following echo $JAVA_HOME (blank) echo $PATH (displayed, but not the JAVA_HOME value) Nothing happened, like if the export of JAVA_HOME and it's addition to the PATH were never done. Solution I had to go to ~/.bashrc and add the following entry towards the end of file #Source bash_profile to set JAVA_HOME and add it to the PATH because for some reason is not being picked up . ~/.bash_profile Questions Why did I have to do that? I thought bash_profile, bash_login or profile in absence of those two get executed first before bashrc. Was in this case my terminal a non-login shell? If so, why when doing su after the terminal and putting the password it did not execute profile where I had also set the exports mentioned above?

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• Can I use standard tools to get the full name of a process, when its name has embedded spaces?

  - by fred.bear

  I understand that it may be a rare situation for an executable to have spaces in it, but it could happen. An example may be the best explanation.. Using standard tools, I want to determine the location (on the file system) of the executable which owns(?) the current window... get the current window ID ...(xdotool getactivewindow ) use the ID to get the PID ...(wmctrl -p -l | sed ... ID .... use the PID to get the executable's name ... (ps -A ... here is where I run into problems ! Whith ps, when listing only the executable's name (-o ucmd), it truncates the name to 15 characters, so this rules out this option for any name which is longer. Widening the column (-o ucmd:99 ) makes no difference.. If pgrep is anything to go by, its matching is limited to 15 because of stat (see: info pgrep).. Listings in variants of "full" mode (eg -A w w) are not useful when the name concerned has spaces in it, because this name is separated from its args by another space!.. Also, in "full" mode, if the process was started by a link, the name of the link is shown, rather than the executable's name. Is there some way to do this (using standard tools)? ...or are spaces a show stopper here?

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• What has 'rm -r ~' done to my home directory?

  - by GUI Junkie

  gedit creates hidden backup files ending with '~'. I wanted to do a recursive cleanup of my directory tree. The command rm *~ will delete all local files ending with '~' I thought rm -r *~ . would delete all files in the whole tree, but I typo-ed rm -r ~. There was a message some directory could not be deleted and I quit the command. The question is: What have I been deleting? I did notice that my Filezilla configuration was gone. Does this command delete all hidden directories from the home dir?

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• How to copy files via terminal?

  - by Levan

  This might sound silly for some people but I'm new to Linux and don't know how to use it as good as other people, yes I rad about copying files with terminal but these examples will help me a lot. So here is what I want to do: Examples: I have a file in /home/levan/kdenlive untitelds.mpg and I want to copy this file to /media/sda3/SkyDrive and do not want to delete any thing in SkyDrive directory. I have a file in /media/sda3/SkyDrive untitelds.mpg and I want to copy this file to /home/levan/kdenlive and do not want to delete any thing in kdenlive directory I want to copy a folder from home directory to sda3 and do not want to delete any thing on sda3 directory and opposite I want to cut a folder/file and copy to other place without deleting files in that directory I cut it into.

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• When is it appropriate to use colour in a command-line application?

  - by marcoms

  Currently I have a command-line application in C called btcwatch. It has a -C option that it can receive as an argument that compares the current price of Bitcoin with a price that was stored beforehand with -S. Example output with this option is: $ btcwatch -vC # -v = verbose buy: UP $ 32.000000 USD (100.000000 -> 132.000000) sell: UP $ 16.000000 USD (100.000000 -> 116.000000) The dilemma is whether to use colour for the UP or DOWN string (green and red, respectively). Most command-line applications I know of (apart from git) stay away from colour in their output. In my desire for btcwatch to look and be quite "standard" (use of getopt, Makefiles, etc), I'm not sure if colour would look out of place in this situation.

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• Open Terminal with multiple tabs and execute application

  - by user172001

  I am new to linux shell scripting. I want to write a shell script which will open terminal with multiple tabs; it should run rtsp client app in each tab. For this, I have gone through question here in this forum and tried to code like bellow, tab="--tab-with-profile=Default -e " cmd="java RunRTSPClient" for i in 1 2 3 4 5 do # foo="$foo $tab $cmd" done gnome-terminal $foo exit 0 This is running and opens the terminal window with tabs but suddenly it will close. I am not getting any errors.

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• Installing a directory with a Debian Package

  - by Meisie

  Hi guys I want to create a Debian Package that installs a bunch of Folders to a system but I can't get it working. The Package gets created without any errors and lintian also says it's okay but installing does nothing. The rules file looks like this: <#>!/usr/bin/make -f logs = $(CURDIR)/shell_logs/ DEST1 = /opt/Pacetutor/ build: build-stamp build-stamp: dh_testdir touch build-stam clean: dh_testdir dh_testroot rm -f build-stamp dh_clean install: build clean $(logs) dh_testdir dh_testroot dh_prep dh_installdirs mkdir -m 755 -p $(DEST1) <- this is propably optional or not needed -> cp -r $(logs) $(DEST1) <- using mv works but thats not what I want. -> binary-indep: build install dh_testdir dh_testroot dh_installchangelogs dh_installdocs dh_installexamples dh_installman dh_link dh_compress dh_fixperms dh_installdeb dh_gencontrol dh_md5sums dh_builddeb binary-arch: build install binary: binary-indep binary-arch .PHONY: build clean binary-indep binary-arch binary install

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