Ask Ubuntu General Room

Andrew

2:28 AM

What should I flag this as askubuntu.com/questions/523033/… ?

hbdgaf

3:02 AM

if anyone is using docker and doesn't mind testing out a dockerfile, ping me please.

Whaaaaaat

0

Q: How would I speed up a full disk dd?

I am doing a dd on two identical drives with this command: dd if=/dev/sda of=/dev/sdb bs=4096 Both hard drives are the exact same model number, and both have 1TB of storage space. /dev/sda uses a blocksize of 4096. Is there a way to run this drive copy that takes less that 96 hours? I am o...

bumping on chat.

hbdgaf

you don't really "speed up" dd. clonezilla is faster probably because it ignores empty space, so it doesn't copy each block. not sure if making block-sizes match read/write sizes would speed it up or not, but there was some discussion of that not mattering in Travis Goodspeed's goodfet talk.

Nathan Osman

o/

hbdgaf

o/ @NathanOsman

Whaaaaaat

o/ What is with this? \o

Nathan Osman

3:10 AM

My mobile carrier had a network-wide outage today... for like four hours.

hbdgaf

@Whaaaaaat stick figure waving.

Whaaaaaat

@NathanOsman It's better than Verizon.

hbdgaf

@NathanOsman my laptop had an outage earlier when i hit 100% disk usage and didn't notice... so nothing was working right. still freeing up space. there should be a service that monitors that and pops something with notify-osd when you get close...

Whaaaaaat

What, no ending underscore?

hbdgaf

you have to escape underscore. it thinks it's a meta-character

like this \_

Whaaaaaat

3:12 AM

AH.

\O\

^ dancing stick figure.

hbdgaf

removes onebox fc07.deviantart.net/fs71/f/2010/041/8/9/…

I win

Whaaaaaat

Your move...

hbdgaf

That's no stick figure... besides, at this point - wouldn't you rather see deadpool?

Whaaaaaat

......

hbdgaf

Anyway, sorry about your outage @NathanOsman - didn't interfere with anything major i hope?

I'm on a 5 day vacation. So, playing with interesting things.

@Whaaaaaat okay, okay... let's not spam the room

Seth

3:17 AM

@hbdgaf @Whaaaaaat he said.

Whaaaaaat

k

Seth

There are various tricks, but they aren't exactly recommended.

For example:

6

Q: Fast Disk Cloning

Is there a way to have Linux read ahead when cloning a disk? I use the program named "dd" to clone disks. The last time I did this it seemed as though the OS was reading then writing but never at the same time. Ideally, the destination disk would be constantly writing without waiting that's of...

linux dd hdd

108

Q: Using DD for disk cloning

There's been a number of questions regarding disk cloning tools and dd has been suggested at least once. I've already considered using dd myself, mainly because ease of use, and that it's readily available on pretty much all bootable Linux distributions. What is the best way to use dd for clonin...

disk-cloning dd

25

Q: Is there a way to determine the optimal value for the bs parameter to dd?

On occasion I've seen comments online along the lines of "make sure you set 'bs=' because the default value will take too long," and my own extremely-unscientific experiences of, "well that seemed to take longer than that other time last week" seem to bear that out. So whenever I use 'dd' (typic...

performance dd file-copy

I love your username @Whaaaaaat. It lets me do all these ping tricks ;p

hbdgaf

@Seth nice

Whaaaaaat

@Seth :D | Feel free to abuse it.

hbdgaf

@Whaaaaaat abuse it? We would never do that...

Whaaaaaat

3:22 AM

@hbdgaf @Surrrrrre

hbdgaf

Oh, the fun one could have with an army of socks in an orchestrated discussion. It would be like who's on first.

Whaaaaaat

@hbdgaf @Whaaaaaat?

hbdgaf

Who's on first

Whaaaaaat

@hbdgaf I got that. What about the "army of socks"?

hbdgaf

lots of sock puppets with names specifically designed for a comedic discussion.

Whaaaaaat

3:25 AM

ah.

Cleverbot <-> Cleverbot.

Someone needs to write a script for that.

hbdgaf

Chipping in on w3af bug squashing and dockerizing at the moment, so cleverbot rubber-duckying itself is pretty low on my priority list...

@Whaaaaaat luis gave you a good answer

Nathan Osman

I've spent the week working with Docker/Fleet/CoreOS.

Lots of really interesting stuff in there.

Whaaaaaat

@hbdgaf thanks for noticing that.

I'll try it once I get my laptop back.

hbdgaf

@NathanOsman I'm toying with docker and lxc. I like lxc giving me more control over the nuts and bolts, but I'm sure docker would be easier for orchestration.

The problem is shared storage on other platforms with boot2docker requiring setting up something to jump through virtualbox to the host.

Whaaaaaat

Script made :D

Nathan Osman

3:39 AM

@hbdgaf Are you on Windows?

hbdgaf

@NathanOsman I'm on linux, but the app I'm dockerizing wants to run on Windows and Mac.

Nathan Osman

I'm not sure I understand. Docker only works with Linux operating systems.

hbdgaf

So, I'm testing with boot2docker running virtualbox inside of vmware...

Whaaaaaat

I made a mistake.....

hbdgaf

@NathanOsman boot2docker lets you run a linux box inside of vbox and sets up basic networking for you... then docker runs in that vm, and it lets you run dockerized stuff on non-linux platforms with another layer of pain.

Nathan Osman

3:41 AM

Ah.

Whaaaaaat

cleverbot.com/j2log-hMgKWlCISZGBVAAMHKGE-detail

^ Bot chatting with itself.

Seth

A couple of my friends once hooked cleverbot up to a public chat system.

One on one chat system.

Whaaaaaat

lol

Seth

It was weird.

Whaaaaaat

Wow. I am getting 403s on Cleverbot. I think I crashed it o.O

Luis Alvarado

3:44 AM

That bot owes me some money

hbdgaf

@LuisAlvarado heh

Whaaaaaat

It'll pay you in Botcoin.

Luis Alvarado

a ok botcoin is find then ^^

btw try the pv command on your question about dd and let me know

Whaaaaaat

it'll pay you 3 botcoins, worth about 0.000000000000000000000000000000000000000000000000000000000000001 cent / 1 billion botcoins

Seth

@LuisAlvarado ahahaha.

Whaaaaaat

3:45 AM

@LuisAlvarado I'll do that when I get my laptop back from BestBuy.

Seth

How is it going buddy?

Luis Alvarado

better make it 4 botcoins then

Whaaaaaat

lol

Luis Alvarado

@Seth well not so good, health fine, financially looking for a job

Things here are a bit Non open source in many ways

Seth

Well good luck with the job search! I see you moved back to Venezuela?

Luis Alvarado

3:47 AM

not yet, it depends on several factors, am trying not to.

Seth

ah, well, best of luck to you!

Luis Alvarado

ty

Whaaaaaat

/me interrupts mod chat

Luis Alvarado

... still waiting for the 5 botcoins....

Whaaaaaat

.....

It was 3.

Luis Alvarado

3:52 AM

I remember 15 but hey you are the one owing me so.....

Seth

Luis, you are the best! xD

Luis Alvarado

You too buddy, you rock!

Whaaaaaat

8 mins ago, by Whaaaaaat

it'll pay you 3 botcoins, worth about 0.000000000000000000000000000000000000000000000000000000000000001 cent / 1 billion botcoins

the joke here is that botcoins don't even exist.

So you already received them.

Luis Alvarado

@Whaaaaaat!!! Do you mean to say you are not paying me 25 botcoins in chinese currency via a swiss account transfer to the bahamas???

Whaaaaaat

I never used the word "I'll"

I always used "It'll"

Luis Alvarado

3:56 AM

Good old Watson! you got me yet again.

correct me if am wrong but relatime includes noatime right?

just noticed I am talking about relatime ^^

hbdgaf

it was my understanding that it had different characteristics, but that almost nobody uses it.

Whaaaaaat

I might have dogecoin to spare...

@LuisAlvarado Want 25 doge?

I should have it ready in 24hrs

this is sad: xkcd.com/695

Eliah Kagan

4:41 AM

Does udev automatically restore disk device nodes when dev gets mounted, or do they have to be manually restored? Someone apparently wanted to delete files off a drive, but performed sudo rm ... operations on its device node in /dev instead! I'm not altogether sure the operations succeeded, since guest shouldn't be able to sudo to root, but it's odd there were no errors indicating failure.

Whaaaaaat

@EliahKagan I didn't get that question...

Eliah Kagan

@Whaaaaaat They want to remove files from /dev/sda7. Of course the correct way to do this is to remove them from inside wherever it's mounted. But instead they have removed, or attempted to remove, /dev/sda7 itself. The other factor in play appears to be that they are unaware many commands, including rm, succeed silently, and are interpreting the absence of output as failure.

Whaaaaaat

@EliahKagan I finally got it. I think they just permabroke their system.

@EliahKagan Y'know what's weird? This guy knows that the /dev files contain the information about hard drives...

and about unix nodes, but they don't know about mount.

Eliah Kagan

@Whaaaaaat Well if the only bad stuff they did was delete nodes in /dev, that should be fixable. I'm just not sure how / what the best way is to restore those nodes. There's a mknod command for this, but I'm not sure that's the best way. I wonder if udev would just put them back on reboot.

On the other hand, I'm not confident the system will actually boot back up, depending on what else they've changed in /dev. I think it will, but my knowledge in this area is not strong.

@Whaaaaaat Yes, that is strange. My guess is they saw some message that mentioned the volume by device name. But I'm not sure what.

Whaaaaaat

@EliahKagan I think udev does, but I'm not sure either. They may have just borked their Ubuntu install completely. Usually /dev isn't forgiving.

Nathan Osman

4:55 AM

What does everyone think of systemd?

Whaaaaaat

@NathanOsman Do you mean systemv?

Nathan Osman

No, systemd.

freedesktop.org/wiki/Software/systemd

Whaaaaaat

Is it only Fedora?

Nathan Osman

No, Debian and Ubuntu as well.

Whaaaaaat

@NathanOsman Is it the thing that says everything is okay at boot time?

Nathan Osman

4:58 AM

Something like that...

Systemd

systemd is a system management daemon designed for Linux and programmed exclusively for the Linux API. For systems using it, it is the first process which is executed in user space during the Linux startup process. Therefore, systemd serves as the root of the user space's process tree. The name systemd adheres to the Unix convention of making daemons easier to distinguish by having the letter d as the last letter of the filename. == Components of the systemd software bundle == Systemd is not just the name of the init daemon but can also refer to the entire software bundle around systemd. This...

Whaaaaaat

I like it. It says everything is okay.

Nathan Osman

It's very monolithic to say the least.

Whaaaaaat

@LuisAlvarado I have 25 dogecoin for you.

Who wants 2.55401301 DOGE?

Nathan Osman

5:44 AM

Here's a Python snippet that will bite you if you're not careful:

>>> type(4**16) == type(4)
True
>>> type(4**32) == type(4)
False

Ooh. And this one's good too:

>>> 012 == 12
False

3

If you don't believe me, open a terminal and try it for yourself.

Eliah Kagan

6:28 AM

Because the leading 0 makes Python (and many other languages, though not all) interpret it as octal. :)
>>> 012
10

Nathan Osman

Yup, you got it :)

You'd be surprised how many people scratch their heads when they see that one.

Eliah Kagan

6:44 AM

@NathanOsman A related source of confusion is that bash (since version 4 I think) accepts {0m..0n} syntax for generating 0-padded ranges, but still treats multi-digit numerals with leading 0s as octal in numerical evaluation.

ek@Ilex:~$ for i in {010..020}; do echo $i, $((i)); done
010, 8
011, 9
012, 10
013, 11
014, 12
015, 13
016, 14
017, 15
bash: 018: value too great for base (error token is "018")

Ubuntu Questions on U&L

7:24 AM

0

Q: Which Ubuntu GUI and programming IDE should I install?

I am trying to select a GUI for Ubuntu. If I just asked which one is best, I'd probably get a religious debate until the question was closed. But I'm asking which is the best fit for my needs, so here's a list of background details: I just bought a used laptop (Intel Core 2 Duo, 2.1 GHz, 3 GB m...

ubuntu gui

Awal Garg

8:46 AM

hey any sudo/terminal master here?

I have a set of scripts which all require sudo privileges

but I don't want to enter my password each time I run them

Is it possible that I just enter my password once and any subsequest execution of any of those scripts goes elevated?

Takkat

@AwalGarg see askubuntu.com/questions/376199/…

Awal Garg

@Takkat thnx, I will check it out right now :)

Takkat

it's basically running the shell as root - be careful what you do there, and don't forget to exit ;)

Awal Garg

umm, no that's not what I want... those scripts are in a folder, but I don't want to open a terminal to run them, I double click, they run, work done.

but it asks my password everytime

Takkat

Make a "master" script to run all your sub-scripts, then run the master with sudo?

Awal Garg

8:55 AM

@Takkat I don't want to run them in series. They are a set of actions, like macros. I would be operating them variably.

I guess I would just have that master script terminal open then, so it would be equivalent to having the folder of those scripts open

and I can run those scripts from that terminal via name

Takkat

double-click GUI sudo actions are not really secure, that's why we can't recommend them. (but of course we could also run Nautilus as root as long as we are not insane with what we do and rememer to quit Nautilus after finished...)

Awal Garg

thanks @Takkat

Takkat

(we may be insane by accident)

Awal Garg

@Takkat yea right

Ubuntu Questions on U&L

1

Q: How can I deny internet access to all processes except the chosen ones?

Sometimes I am forced to use really narrow Internet bandwidth of 56kbps. On my Ubuntu desktop I have too many programs, that frequently check something on the net - and hunting and disabling them one-by-one is really troublesome. I'd like to have some tool, that would deny internet access (by w...

ubuntu networking

0

Q: Dual Boot with Grub: can't boot Arch Linux

my History I installed Ubuntu 14.04 LTS at /dev/sdb1 and Arch Linux at /dev/sda1. Both swap onto /dev/sdb2. I tried (with succes) to install Arch Linux onto a SD-Card for my raspberry pi. There I tried to install vim to the SD-Card using pacstrap. This produced a few errors. After rebooting my ...

ubuntu arch-linux boot grub2 dual-boot

0

Q: How good do Chromebooks support other Linux distributions?

As many manufacturers of Notebooks do not offer any Notebooks without Windows preinstalled anymore, the next best thing would be a Chromebook. I'd like to know how well do/will other Linux Distributions like Ubuntu and Fedora work on these new Chromebooks? I talk about all kind of drivers, bat...

ubuntu fedora drivers chrome-book

Journeyman Geek

9:09 AM

.... WELL NOT GOOD

Awal Garg

guys is there a keyboard shortcut to duplicate a file in the same directory?

oh wait..

ctrl c and ctrl v ofc..

Oli

9:25 AM

@JourneymanGeek You alright?

Journeyman Geek

9:41 AM

@Oli:Great!

(that english tho...)

hbdgaf

11:21 AM

@UbuntuQuestionsonU&L another user asking for a per-process firewall on linux again...

Journeyman Geek

11:38 AM

Yup

Or just a firewall set up to block all the things

hbdgaf

12:14 PM

I guess someone could hotpatch the relevant socket calls and just error out if the md5 of the process binary isn't in the whitelist or something... but why would you need to?

Pandya

Does we have any (single) canonical question about changing or setting default directories like:desktop,download,.. etc by XDG dirs? then give link of it. (~/.config/user-dirs.dirs or xdg-user-dirs-update)

Or it is better that I will prepare?

hbdgaf

The one you edited seems fine. It's good enough for now. That doesn't mean start hunting down all the xdg questions you can find and start duping them though.

Pandya

@hbdgaf Is it not possible to provide single one which includes all option (so-that new users can find all info/dirs from that)? (or it is not Right way?)

hbdgaf

Stop ping hammering me.

now you're in the ignore box for some minutes.

Pandya

@hbdgaf ok.

By the way i found two questions this, this may be helpful which has also many views.

Rinzwind

12:34 PM

@Pandya and why do you ping him after he asks you not to? ;-) Not a smart idea :D

hbdgaf

I didn't have a problem with A ping. I had a problem with repeatedly editing a ping message ... so I get that irritating ding.ding.ding.ding.ding. sets to ignore

@Rinzwind but yes, that too

Pandya

@Rinzwind In second & last line I not used his name by "@" but/and-hence written message for general discussion.

Rinzwind

I have no sound on on my work PC >:-D so ding away @Pandya :D

Takkat

12:59 PM

no sound is a red herring... it makes me stop reading. ;)

Rinzwind

@Takkat careful or he will ding ding ding ding you too

Takkat

<-- has no sound

:) \o/ \o/ \o/

hbdgaf

chromium really does need a way to mute individual tabs though. that would be awesome.

like - "default all my tabs to muted. if i want to hear one of them, i'll turn on audio for that tab" in the age of obnoxious advertising

Takkat

yeah - this commercial video playing in one of these tabs always makes me hate the webmasters of the site, and may lead to a permanent ban of the site from my side. :)

No. one reason I muted my speakers here at the office.

hbdgaf

I'm on a 5 day staycation, so not muted here at home

Pandya

2:32 PM

I have installed xubuntu-desktop in Ubuntu 14.04 so, starting & login screen changed to Xubuntu. Now how can I get back (return) default (Ubuntu) starting & login screen ?

jokerdino

@Pandya sudo update-alternatives --config default.plymouth

Pandya

2:46 PM

@jokerdino Thankyou, It worked. Optional: It status is manual mode how to set it as auto mode?

jokerdino

one sec

@Pandya sudo update-initramfs -u

muru

Essentially: askubuntu.com/a/2292/158442

jokerdino

yep. vote it up!

badp

3:32 PM

@jokerdino OMG UPVOTE BEGGING? WTF BAN

jokerdino

it's not even my answer pls

hbdgaf

4:23 PM

i was playing with plymouth themeing a while ago

KasiyA

5:07 PM

hi every body. I have a new problem. I installed fresh ubuntu 14.04 and now I typing in terminal and pressing <Space> I get with delay and not real time

about ~0.5 seconds delay then reaction <Space> key

Ubuntu Questions on U&L

5:23 PM

0

Q: how to add wamp feature to lamp

i am used to do web development using wampserver in windows but recently i wanted to move to linux and i am using lamp now but i found that some useful feature in wampserver are not available in lamp like : switch online/offline stop all services restart all services start all services so how...

linux ubuntu webserver

hbdgaf

@KasiyA if your operating environment is resource constrained and you're doing lots of stuff, you'll get lag. bug status - works for me

KasiyA

5:51 PM

Hi. no I used this version last day and +3 month earlear ago and I don't have this problem but after reinstalling this happened

and also worked for me in 3 month. today found this problem for me

@hbdgaf

hbdgaf

I still suspect it's a resource constraint. Like your disk is full or you're listening to one to many streams and listening to youtube while it happens.

Happened to me yesterday. "Why am I so laggy and idiotic errors?".... 2 hours later "crap, my disk is full"

KasiyA

no I only use terminal and I don't add to my HDD any files also it's fresh

hbdgaf

good luck then.

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