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and i today we are a little
different set up because we could

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get studio today it sunlight and
 we are an academic triples

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next week so we need to get the
 last videos finished right

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now say today we're going to talk
 about version control which

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is really quite say let's say
we working attain and we want

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to remake how they
actually share our

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yeah i actually share
files were used is good

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it's good right yeah that's
 what size can actually

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what the thing about my
do you know my inbox

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yeah my email program know
 not going to happen

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and if you case you wandering also
 flood storage is not a good

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choice say neither right nor
dropbox nor enclaves or even as

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at each and is not optimal
for so start believe us

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because there's something better
right because we've got certain

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requirements so whenever we develop
 programs we already learned

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to team effort so we've
got many developers who

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edit many source foils so and
and many people are touching

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the same files in worst
case even simultaneously

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and even the same line of code
sometimes so what do we do now

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say in case you're wondering
 there is no such thing

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as a life editing of source so
that you may have seen that

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in like google docs or in one
drive light that also has this

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web thing you make an added with
multiple people the same time

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that doesn't work for
 such conduct heat

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yeah because if i just to lead
us and we call on and then i

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become ram and you can tag compile
 your code you will get really

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angry do you really so
probably we all need

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all copy of the source code but
we somehow need to also share

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yeah cosmo as
it turns out

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there what do we also
need we want to track

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the changes so whenever you do
 something i want to see ok

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and develop that great feature
 i want to praise them

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and also i go back in time and
see who didn't want in order

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to ask questions or see who
introduced in fact when that person

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or whatever you might meet and
the other thing is that you

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might want to resolve conflicts
 so if you guys and the same

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line and degraded here and we did
 the same thing in a different

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way yeah which ways in cities
say and of course program is

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love to develop two lane because
 they love programming so i

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guess what the dates they introduced
 version control as a separate

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tooling and version
control assume that

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four different version
control tools they all

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more or less your work the same
they've got different features

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and we once again
introduce one example

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yeah so let's assume we are
developing the and right out of

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our method p and i can actually
 i is open source by the way

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and at the top so you can check
that out so i can make it even

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better yeah say what i want today
 is to have a history of i

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will change my an activist
 from allows us to

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say you can see this is a graphic
right there is i can basically

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bound means that changes the g
used and that is organised in

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an airway because over
time we have more things

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and we can also go back someone
 introduce some question of

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the future or introduced about
we can just go back and say

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ok no let's go somewhere else and
yeah can pinpoint what happened

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in the history yeah and basically
 want that's changes as mice

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to court it commits yeah and
we introduce who did this

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for what purposes and when so
basically to commit method should

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be really descriptive so we've
got a the message times them

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and the also to yeah
besides that we actually

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want to maybe have
different copies are

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designed software so maybe you're
 working on open a chair i

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am i z organize a p said
yours is more yellow orange

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and minus more building again
i can actually we might need

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different bases and if i if you
 use a feature and he didn't

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change want to match it
may be that together

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and yet that is basically
 branching and russia

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yes they they're different features
 branches that kind of go

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off from one main branches
 like a big line there

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and at some point we might
want to like merge them back

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and the main branch is also
called the master branch

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and if i have the polar or more
 less official software and

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you are developing some features
 there of course i want to

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make sure that is all well
documented that you use

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good in identifier so that
 i have speaking names

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that you did the way
i wanted to be you

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know just joking so
most of you've got a

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certain qualitative standards in
your software so there's also

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the possibility to add like a
gatekeeper and someone has to

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give his sums up or two cousins
 need to give of sums up

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in order to be yet the changes
to be accepted into the master

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branch so that is
also more or less

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the tool so to improve the quality
 of software so that at least

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three poses have seen
 the code yeah and

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when you yeah you basically develop
 something i develop something

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we are changing the same line
of code we need some way of

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resolving the conflicts so working
towards have conflict resolution

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and last but not least that comes
is a very important for program

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is that there is actually now one
copy of software on one laptop

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somewhere rather like distributed
 over must compute transform

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on nine seven so the next he
multiple people can access so

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when i when i check out which is more
 less download the repositories

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all the all the files
of the source code

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then i of course created local
more less back up on my computer

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and everyone who does
 it has a complete

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yeah all vulcans also
software and wall at

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a computer scientist to do that
can really see right yeah say

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i pray one liter of water over
my book like fight there is

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prior to that actually
 faeces that line

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and really freaking out that i had
 a back up in version control

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like it was also support ating
is obviously and i was really

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glad to the data at site
i love version control

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like poor laptop
yeah ved really

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do version control that really
say july sometimes did for me

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and i'll say if you really want
to become a professional suffer

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development is no way around it
 and now finally one example

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of a version control system
 is get we have chosen

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it because it's free and open
source and it's really quite

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you're a little
 bit buyers

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maybe a little bit ab that
gets it you're which was is

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it also he does the defector
standard basically for something

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about and say only very
few people do not use

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it now based on like old software
 that has developed for many

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years that is still on the old
systems they also have their

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rights to be there so
there the pros and cons

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so there's also it also as the
and there's a really old cbs

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so there are different
options you can use mercury

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whatever about we're showing
 get here almost motor

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control systems can do
the same thing yeah

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get is distributed that means
there's no oneself elemental

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that has all the cans and and
everybody has to after that everyone

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on their machine has a full copy
 of for repository means the

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full cool place with all these three
 and say i don't have actually

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interconnects i'm working
 on trainer something

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i actually is still can
be that and once i have

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internet's back in time as you
can can exam push it changes

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and now we spoke about the
repository repository quite often

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so there's lots of a
cavalry behind that

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and a repository is
more list let's check

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all the fires together and whenever
 i change show files i do

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something like commit and that
is basically just my name or

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also scored my also type
 because we can write

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anything i want their then
 i have a commitment

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such so more less i should really
 descriptively say what i

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had done there because
everyone will see that

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and i've got a times
there so just like

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when did i do that and with that
 we have a really good book

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on control already
because we know who did

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what when yes they basically
if i gave at six o 'clock

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from the office back in time and
 i'm an office back again in

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the morning and i can check
actually what happened throughout

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the night and see who did
what and how can that say

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it is out of many
reasons really helpful

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and there's also some more vocabulary
 and we're going to cover

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all that in an example