I cannot vouch for the quality or integrity but my guess is that it is legit.

 

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java7-installer

Read more: Link - 10 Things To Do After Installing Ubuntu 14.04 Trusty Tahr To Get A Near Perfect Desktop ~ Web Upd8: Ubuntu / Linux blog

Note to self:

ClojureScript interface to Facebook's React

A clojurescript interface to a javascript library

Update: Did not work that well on my Ubuntu 13.10; seems to have hard coded names for stuff that have other names on Ubuntu.

Requires package libav-tools on Ubuntu 13.10 .

 

youtube-dl is a small command-line program to download videos from YouTube.com

Read more: Link - youtube-dl

Impressive demos, including picture in picture. Uses ffmpeg and numpy.

 

Read more: Link - MoviePy — MoviePy 0.2 documentation

Summary:

Type

openssl version

With the recent disclosure of the long standing heartbleed bug, it is a god idea to check what version of openSSL you are actually running. Just type openssl on the command line followed by the word "version". According to this page, the versions that are compromised are

• OpenSSL 1.0.1 through 1.0.1f (inclusive)

OpenSSL cheat sheet

Well actually two, but you stick them in one file that gets executed in bash:

ssh -fN  -L 5900:localhost:5900 remotserver.example.com
vncviewer -encoding tight -quality 5 localhost:0

The -N switch prevents commands to be sent to the remote host, the -f switch allows the terminal to come back and prompt for a vnc password that is triggered by the second line.

Warning: Haven't figured out how to exit cleanly. However the top rated answer here might do the trick:

Bash script to setup a temporary SSH tunnel - Stack Overflow
 

Tightvnc used in this case:

vncviewer -encoding tight -quality 5 localhost:1

It gets harder and harder to install a python 2.4 buildout on Ubuntu and Debian. Basically, the different scripts involved will try to execute code that is not compatible with python 2.4 at every step of the way. I need python 2.4 for some old Plone 2.5 sites. Here is what I did to get it running this time, tested both on Ubuntu 10.4 and Debian 7:

Use a separate virtualenv script, so do not rely on the one installed in the system which is made for another python version. Instead download a standalone script of some vintage:

wget --no-check-certificate https://raw.github.com/pypa/virtualenv/1.7.2/virtualenv.py

Setup the virtual environment like so:

python2.4 virtualenv.py .

It will crash when trying to install setuptools, but by then it has installed python.

Now you should have a working python.

Time to install a setuptools that actually works. Version 1.4.2 works (somewhat selected at random, you can try newer ones if you like). That version is not linked from the https://pypi.python.org/pypi/setuptools page, but with some detective work it can be found at:

https://pypi.python.org/packages/source/s/setuptools/setuptools-1.4.2.tar.gz

Download and unpack it and install it in the old-fashioned way:

./bin/python setuptools-1.4.2/setup.py install

Time to install easy_install. Download the script from:

http://peak.telecommunity.com/dist/ez_setup.py

Then install easy_install with:

./bin/python ez_setup.py

Time to install zc.buildout:

./bin/easy_install zc.buildout==1.4.4

In your buildout.cfg file, you must also pin setuptools to the version you have installed. Otherwise, you guessed it, zc.buildout will download and fail to run a newer incompatible version of setuptools:

[versions]

setuptools = 1.4.2

And there you go:

./bin/buildout

I had the need for a quick and easy way to publish a table on some free web publishing service. The table must be easy to edit. However finding a free blog site or web publishing site where you can add tables in the wysiwyg editor turned out to be not that easy. In fact I have not found one yet:

Update 2015-03-23: It seems that the program get privileges to both accounts. If I start Firefox with it, it can read both from my account's files and the the account that sox runs it as.

sux seems to do the job. If you are on Ubuntu:

sudo apt-get install sux

sux other_user_name gui_program_to_run

You may need to include the full path to the program you want to run, e.g. if is a Windows program to be run under wine

sux other_user_name wine /path/to/program

Haven't tried without full path though.

There is a "hidden" setting in Gnome that allows you to use two fingers on the touchpd (trackpad) to emulate right click (context click). Read more here:

http://askubuntu.com/questions/331605/simulate-right-click-in-laptop

The instructions are for Ubuntu, but the user appociappo's instructions worked like a charm on Debian 7. It contains a patch to setup.py, and flags for the C compiler and loader:
 Link - [ubuntu] compile python 2.4 and 2.6 on 12.04 x86_64

Furthermore, if you are using bootstrap.py for e.g. a Plone buildout, this bootstrap.py seems to work:

http://blog.fourdigits.nl/python-2.4-bootstrapping

Boot with a live CD or live USB. Assuming that your install is availableat /dev/sda1, then, quoted from:

http://askubuntu.com/questions/112957/display-works-fine-in-livecd-but-not-in-full-installation

sudo mkdir -p /media/ubuntu
sudo mount /dev/sda1 /media/ubuntu

Then you need to mount the proc, dev, and sys filesystems into your new environment:

sudo mount --bind /dev /media/ubuntu/dev
sudo mount --bind /proc /media/ubuntu/proc
sudo mount --bind /sys /media/ubuntu/sys

Finally, chroot into it:

sudo chroot /media/ubuntu

Now edit /etc/default/grub, uncommenting out the line

GRUB_GFXMODE=640x480

and then run

sudo update-grub

There is a script walk-through at the bitcoin wiki. It is not all that easy to understand, since it could be formatted and presented better. I show here the current table as it looks on the Wiki, and then further down my hopefully improved version. Here is what the original looks like:

Checking process:

So, in order to understand this, there are a couple of things that are kind of obscure in that table, namely:

• In the column "Stack" the top of the stack is the last item, which means that since the text wraps in the field, if there are multiple lines, the bottom-most item is at the top of the stack
• In the column "Script", it is actually the same script in all rows, just less and less of it.
• The comments seem to be written as to what the state is before the script part executes

It might be cleaner to do like this instead:

• Let the topmost item in the "Stack" cell in a row, be at the top of the stack, and number them.
• Only write the part of the script that is executed in a row. List entire script before the table for clarity
• Description should descibe what happens when the code in the row, operates on the stack in the row

Then it becomes like this:

Checking process:

Entire script is:

<sig> <pubKey> OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG

If you use different devices for your XMPP chat, it can be a chore to have different nicks just so that you do not get kicked out or blocked when you log in from device number 2.

Newer versions of ejabberd (13.10 tested) allows this by default, however the old version (2.1.2) shipped with Ubuntu 10.4 does not. Openfire did not allow it in the version I tested, and it seems that it is not possible.

Just a note to self:

 

Create and configure lightweight, reproducible, and portable development environments.

Read more: Link - Vagrant

Taken from: Link - How to format a USB flash drive? - Ask Ubuntu

sudo fdisk -l

It will show all the volumes. My stick was at /dev/sdb1 .

Change /dev/sdb1 if the USB stick isn't there and enter its correct address.

If the USB stick is at /dev/sdb1, unmount it with:

sudo umount /dev/sdb1

Then format it with fat32 like so:

sudo mkfs.vfat /dev/sdb1

Oftentimes, I'd like to edit a div in Wysiwyg mode. But the Wysiwyg editors that I use (TinyMCE and CKEditor) do not seem to show divs in an easy way. They do show tables, with borders and all, and I assume the same could be done for divs.

I'd like to see where the divs are, be able to create a div, preferrably by selecting a piece of text and do a "wrap in div" command or some such. And I want to be able to select a div in Wysiwyg mode, and edit its CSS classes.

I guess you could go through their source code and model a div editing capability on the table editing capability.

Hmm, I just realized that showing the divs is just a matter of editing the CSS for the edit view. Half the problem solved.

• For version 4.2 of CKEditor there seems to be a plugin called Div Container Manager .
• Also one called Show Blocks

Div container manager looks promising, but I am not entirely sure of how to integrate it into my CMS, Plone. Just including the file does not work, and additionally adding "div" to the Plone toolbar configuration does not work either.

For TinyMCE there is visualblocks.

Pulling, fetching & merging

I want to track a new remote branch

Check what branches are available at remote:

git remote show origin

Then do:

git fetch origin remote_branch_name:local_branch_name

There are differences between my branch and the remote branch, but I want to see what would be merged in, before doing a pull

Do a fetch first

git fetch

and then compare the branches with

git diff HEAD...origin

I want to merge in another branch, how do I pull down the new stuff in that branch without switching to it?

Do :

git merge origin/other_branch

while being in your branch.

A

git pull --all

followed by a a

git merge other_branch

won't work. "git pull --all" fetches all tracked remotes and updates them, but only merges new updates on your current branch. So even if other branches are updated locally, HEAD hasn't moved in them and from merge's point of view the updates aren't there.

How do I merge in a branch so that everything in the incoming branch takes precedence?

In subversion you can do “theirs-full” as a merging strategy. You used to be able to do that in git too, but it has been deprecated and outright removed.  Here is one way of doing a theirs-full. You simply move to the incoming branch, branch it into a temporary branch, switch to master and merge that one into yours

git checkout -b temporary origin/incoming
git merge -s ours master         # ignoring all changes from master
git checkout master
git merge temporary                        # fast-forward to tmp HEAD
git branch -D temporary                    # deleting tmp

See more at:
http://stackoverflow.com/questions/4911794/git-command-for-making-one-branch-like-another

If you want the incoming branch to completely take over, there are a couple of ways of doing that. Assuming the incoming branch is called “incoming”, and that you are on the “master” branch:

git reset --hard incoming

-or-

git branch -d master
git checkout incoming
git -b master

-or-

git checkout -f -b master incoming

Before you do any of the above you may want to create a branch for your old work, or it is effectively rendered inaccessible. Note that any files from your original master not present in incoming, will be ignored.

Pushing

How do I initialize a remote repository with my stuff and make my local repository track the remote?

$ git remote add origin git@gitserver:/opt/git/project.git
$ git push origin master

How do I push to a fresh remote repository?

If the remote repository is fresh and does not have any branches in it, it does not know where to store your stuff, even if you are on master. Use:

git push --all

It will create the necessary branches on remote and effectively copy all your branches over, including the one that you are on.

See:
http://stackoverflow.com/questions/6157730/why-cant-i-push-to-this-bare-repository

I have created/edited tags, but "git push" does not seem to include them

git does not push tags to remote servers unless you specify that explicitly

git push --tags

...for all tags.

git push <tagname>

...for a named tag

I made a new branch locally, and I want to push it to remote

You need to use

git push -u origin branchname

It will also set up your local branch to track the remote one.

Do not just do a

git push

, because that will push master to master on remote, even if you are on your new local branch.

git push --all

should work too, if you want to push all branches to remote.

Where are the remotes?

git remote -v

shows you what you’ve got
A local branch can track a remote branch. git clone automatically sets up this

Undoing stuff

How do I revert unstaged files to last commit?

git checkout -- .

How do I unstage a file?

git reset HEAD filename

How do i undo my last commit?

Most drastic

Undo your last commit and bring your workspace and staging area back to the state of the last commit:

git reset --hard HEAD~1

if you want to keep your workspace as it is now:

git reset HEAD~1

Least drastic

if you only want to undo the commit but keep both your index (staging area) and your work space as they are now:

git reset --soft HEAD~1

Any of these resets will erase your most recent commit from the commit history! There are ways of getting it back but it is a bit of work.

See: http://stackoverflow.com/questions/927358/how-to-undo-the-last-git-commit

Aborting a merge when you are in the middle of it

Hit Ctrl-c to exit the merge tool dialog
If your git is 1.7.4 or newer:

git merge --abort

If your git is older than 1.7.4:

git reset --merge HEAD

git clean -f

(but this latter will remove all untracked non-ignored files, may not be want you wanted, however you should had made sure of a clean state before the merge, and then its cool)
One would have thought that git stash would help here, but you cannot stash merge conflicts, so it is not an option

My editor removed a file by mistake, how do I get it back and/or
I want to revert a file to last commit

You may see it staged for deletion. Then do a checkout to the branch you are already on, for that particular file:

git checkout -- file_that_was_deleted

It works without the “--”, but since your file name may correspond with a branch name it is best to put “--” in.

git submodule

You can use sub modules in a fruitful way if you’re on git 1.8.2 or later:

http://stackoverflow.com/questions/9189575/git-submodule-tracking-latest/9189815#9189815

http://www.vogella.com/articles/Git/article.html#submodules

How do I get a version of git that is 1.8.2 or newer?

Github and bitbucket already run by default on newer versions. So does newer versions of Ubuntu.

If you are on an older Ubuntu, use:

sudo add-apt-repository  ppa:git-core/ppa

from: https://launchpad.net/~git-core/+archive/ppa

Adding a submodule to a repository

git submodule add -b branch <url> dirname
git submodule add -b master ssh://git@git.example.com/srv/git/awesome_lib.git awesome_lib

When cloning a repository that has a submodule :

When you clone the  parent repository, the submodule does not get cloned into its sub directory. For that you have to do:

git submodule init
git submodule update

How to to remove a submodule

This seems quite involved, but I have successfully done so, following these instructions:

Remove a Submodule within git

Other

How do I add an empty directory in git?

You can’t. Commit an empty .gitkeep file in there and it works though.

git add --patch

Allows for staging just parts of a file, good when you want to make a commit that does not fix two or more things at once.

git add

git add -u will add all changed files it knows about to the staging area, from where you issue the command and recursively downwards. In other words, if you do git add -u in a subdirectry, only changes within that subdirectory will be staged.

Tell bootstrap to use an earlier zc.buildout version Run bootstrap.py with the -v option, forcing it to stick to a specific, earlier version: $ bin/python bootstrap.py -d -v 2.1.1

Read more: Link - setuptools - How to solve pkg_resources.VersionConflict error during bin/python bootstrap.py -d - Stack Overflow