Ask Ubuntu General Room

11:20 AM

@kos perhaps only for main? Because main is important?

@MaartenWachters morning :)

11:31 AM

@A.B. I think I've figured out a way around that: if you run sudo <command> add security, the script scrapes all the components in all the lines for security, create a list with unique entries (this has the added value of removing duplicates), deletes the previous entries for security and rewrites a single entry at the end. Both for deb and deb-src repos. How about that?

@kos Sounds great =)

A: How to automatically execute a command every time a certain command terminates?

0

As normally, sudo bash -c "command1; command2" If you want to run command2 only after command1 is successfully completed, you can use as && rather than ;. sudo bash -c "command1 && command2" I'll use following command for your example. sudo bash -c "add-apt-repository <repo> && apt-get upd...

@A.B. For removing obviously it deletes everything. If there are no previous entries for security, adds an entry with all the components

I got a downvote, i could not understand the reason.

I think that there was a wrong man who gave me a downvote.

hi, @Oli

He does not want to run script for it, please read his comments.

@xiaodongjie Please don't take it personally ... (unjustified) downvoting sometimes happens ... I can sing a song of this. :)

11:36 AM

@xiaodongjie I think it's because the question asks for how to run the second command automatically, i.e. you shouldn't have to write it, otherwise it misses the purpose. Suggesting an alias would be the best answer IMO.

Oli

@xiaodongjie I'm not sure he knows what he wants. He's certainly not communicating it well.

Aliases don't support passing on arguments (we'd need to pass something to add-apt-repository before running something else). And sudo won't wrap them (or functions)

sudo?

@Oli Right, I didn't think. Then a function, for sudo I believe you can create an alias for sudo with a space so that it interprets other aliases / functions afterwards, can't you?

I understood what he wanted at first, but

he changed his mind after you posted your answer, @Oli :D

Oli

11:58 AM

@kos Sure, it gets pretty manic in places though.

Q: Limiting user SFTP only to their home directory

0

Ubuntu 14.04 I'm trying to restrict all users of a certain group to their home directory. They should be able to SFTP to the directory and read/write whatever they like within there. I have implemented the usual solution found in all tutorials: /etc/ssh/sshd_config Subsystem sftp internal-sft...

12:13 PM

@xiaodongjie I can understand you ... so, as a compensation ... I gave +1 to you for your answer ! :)

@Oli I thought you could get away aliasing sudo to sudo and creating / exporting a function to wrap the commands, but if that's needed then probably something isn't occurring.

Fabby

12:40 PM

@A.B. and any other +25K user: undelete votes needed!

fossfreedom

@Fabby - answer undeleted - ping as requested - askubuntu.com/questions/338937/…

Fabby

@fossfreedom Thank you! Upvoted!

me too =) askubuntu.com/a/702352/367165

@cl-netbox thank you.

12:58 PM

@xiaodongjie You're welcome ! :)

I need an external eye on this snippet because I'm looking at it from 15 minutes and I can't understand why it doesn't work. @x is an array containing some duplicate elements; non-duplicate elements are supposed to be copied to @foo, but for some reason only the first element of @x gets copied. grep in scalar context should return the number of entries, so for 0 the if block should be executed and for >0 the if block should not be executed:

foreach(@x) {
        if(!grep(/^$_$/, @foo)){push(@foo, $_); print "Added: $_\n"}
}

(print "Added: $_\n" is for debugging, it can be ignored)

Perl =)

/^$_$/

An empty line followed by a _ and an end-of-line? @kos

/^_\$$/

@A.B. For comparison, if I run this:

/^_$$/

  foreach(@x) {
    print "$_\n";
  }
  foreach(@x) {
    if(!grep(/^$_$/, @foo)){push(@foo, $_); print "Added: $_\n"}
  }

1:13 PM

AAAH, sorry @kos

I get this:

DEBUG: splitting main restricted
DEBUG: splitted 2
main
restricted
Added: main

You mean $_

(and yes, this is for your question)

@A.B. Yes, exactly. It should be the current @x value.

(the DEBUG: lines are printed before the first foreach(){})

@kos Only an idea, test it with /^$_/and /$_$/ and /$_/

three tests =)

Q: Why did this question get so many downvotes?

DEBUG: splitting main restricted
DEBUG: splitted 2
main
restricted
Added: main

@A.B. :(

Also I need an exact match there, so technically I need ^ and $.

Damn, I'm not getting it.

Also maybe if @terdon isn't busy and has 5 minutes he can take a quick look here? chat.stackexchange.com/transcript/message/25682671#25682671. It would be really appreciated, I can't understand what I am missing.

Ask Ubuntu Meta

1:27 PM

0

How to automatically execute a command every time a certain command terminates? What did I do wrong? It's a perfectly suitable question... so why has it got so many downvotes? Was it due to me not being clear in the first place? This question also got quite a few donwvotes, and I don't underst...

discussion asking-questions votes

1:40 PM

@kos The $_ in the grep block refers to the elements in @foo not the foreach(@x).

Anyway, this sort of thing is what hashes are for.

@terdon Hello ! :)

Hi

$ perl -e '@x=("foo","bar","foo"); foreach(@x) { push @foo,$_ unless ++$k{$_}>1; } print "@foo\n"'
foo bar

@kos ^^

Q: I can't boot Ubuntu form DVD, USB

0

i want any advice or help. Hi have a Notebook Acer 4650, installed Win 7 (x64) in hard disk, i need install dual O.S, Ubuntu. I have a Ubuntu 14.04 LTS image, and burn in two disk, create bootable usb, but i can't try or install Ubuntu because show me error lines. init line 7 can't open /dev/s...

14.04 boot dual-boot usb

It's good question?

Or do you only want those elements of @x that only appear once?

If so, use this:

$ perl -e '@x=("foo","bar","foo"); map{$k{$_}++}@x; foreach(@x) { push @foo,$_ unless $k{$_}>1; } print "@foo\n"'
bar

@kos ^^

hbdgaf

@Ravan - updated the answer with the numerical hard limit and an interesting excerpt.

1:44 PM

@xiaodongjie Why not ? It's okay ... ubuntu related ... :)

It needs to reported as a bug rather than question?

Oh, i am a little confused.

@terdon Do you know that I had a similar support session as you had yesterday a few weeks ago ... but was doing this using comments instead of chat ... lasted hours as well. :)

@terdon Man, I see it. Thanks. No this should be fine. What is $k here by the way? I'm assuming it references the current value of @x, doesn't it?

@cl-netbox Brave you :)

@xiaodongjie No, the OP is having problems installing. I edited and left a comment asking for more details.

@xiaodongjie You don't have to be confused ... :)

1:49 PM

@kos It's a hash, %k. I am using it to count how many times the element has been seen. ++$k{$_} increments the value associated with the key $_ in the hash %k by 1. So, if ++$k{$_}>1, then $_ was already 1 and $_ has been seen before.

@terdon I'm assuming $k is interpreted as a hash because of the braces afterwards? Anyway many thanks, got it.

@kos Yes, $foo{$bar}++ adds one to the value associated with the key $bar in the hash %k.

@terdon Perfect, thanks again.

If you were doing it properly, it would be my %foo; $foo{$bar}++

np

Nah, I like it lazy short and cryptic. :D

ubuntu partition freebsd system-installation dual-boot

1:59 PM

0

Q: Cannot install PC BSD

Currently I am using Ubuntu. I wanted to try PC BSD so downloaded 10.2. On trying to install it on a separate primary partition(so that I can dual-boot) I am getting the following error. Do anyone know how to fix it?

@kos Here's a shorter one then:

$ perl -e '@x=("foo","bar","foo"); for(@x){++$k{$_}>1 || push @foo,$_}; print "@foo\n"'
foo bar

Slightly

Ravan

@hbdgaf Oh, thanks =) reading...

@terdon Thanks. I think I'm moving that to an external function at this point since I'll probably need it more than once.

2:18 PM

@terdon @cl-netbox yes, i understood.

@xiaodongjie Thank you :)

@cl-netbox :) thank you.

@xiaodongjie I like the sincerity of your contribution on AU and appreciate this very much ! :)

Q: Amazon EC2 Abuse Report on Linux server

-1

I have received Amazon EC2 Abuse Report Reason: Botnet for my Linux server (dev) from amazon ! I have changed security group such that now no port is widely opened and have mailed them back action taken by me ! Now my doubt is that what if malicious code is within my Linux box ? if yes what sho...

linux ubuntu security malware

2:34 PM

@cl-netbox thank you. Thank you for your help me with up votes.

@cl-netbox upvotes let me work hard for AU.

Q: Deactivate account, share reputation

@xiaodongjie Yes I understand ... we all like this feedback in form of upvotes when we bring up working solutions for other users ... and this includes me myself of course as well. :) ... keep up your good work - you are very welcome ! :)

Ask Ubuntu Meta

0

Due to some personal reasons, I want to deactivate all my stackexchange accounts. AskUbuntu was my main account and it's where I have the most reputation. Is it possible for me to share my reputation with 'deserving' AU members before I deactivate so that it doesn't go to waste? I'm not sure the...

discussion

2:51 PM

@cl-netbox :)

@xiaodongjie :)

@A.B. Are you around?

o/ Hi people.

@kos Yes =)

@ByteCommander o/ =)

@A.B. I have a working script. It needs to be polished quite a bit, but it should work. If you want to give it a quick test just to be sure it does what you want. It works fine for me but, you know :)

@ByteCommander o/

2:59 PM

@kos Give it =)

@ByteCommander Hello my friend ! Do you know CCR ? :)

@A.B. Here: paste.ubuntu.com/13502858. I'll shorten it for the release, now it just works

I didn't make it change the real /etc/apt/source.list, you should copy it into the directory you run it, and the new file is printed to stdout

You shoul call it with perl script.pl enable <distribution> and perl script.pl disable <distribution>

@A.B. Please give it to me ... doesn't this sound nice ? =) ... please don't mind ... :)

@kos

sudo ./apt-add-update enable backports
Couldn't open '/etc/apt/sources.list': No such file or directory at ./apt-add-update line 11.

o_O

@cl-netbox the script?

@A.B. Yes, you should copy /etc/apt/sources.list in the directory, for now I didn't make it change the real /etc/apt/sources.list

3:04 PM

ok =)

@cl-netbox No, what's that?

@ByteCommander Creedence Clearwater Revival - Pendulum (album) : Have you ever seen the rain ? =)

@A.B. HaHaHa ... no ... the nice way you asked @kos to give it to you ... =)

@cl-netbox Ah, yes. I know them! :-)

@ByteCommander A famous band in the seventies ... many big hits ... John Fogerty - ever heard this name ? :)

Clearwater is a beer brand, right?

No, Never heard that name.

3:10 PM

@ByteCommander YES ... and the (beer) rain came down on you today ... got it ? =)

And I have to admit I only know their "rain" song and a cover of Nirvana...

Oh, yes. I've got 120 today before I even logged in! :D

@kos strange ...

% cat sources.list
deb http://archive.ubuntu.com/ubuntu wily main

@ByteCommander pure intelligence ! =)

% sudo ./apt-add-update enable security
deb http://archive.ubuntu.com/ubuntu wily main

% cat sources.list
deb http://archive.ubuntu.com/ubuntu wily main

user139252

@A.B. Ihre Tochter ist besser?

3:12 PM

@A.B. So you don't have http:// at the start?

@ByteCommander and the best rain song ever is from ... guess what ? ... right : mighty LED ZEPPELIN ! :)

Alright. Fixing that real quick

@HeatherBrown "Ihrer Tochter geht es besser?"

@HeatherBrown "Deiner Tochter geht es besser?"

@HeatherBrown "Geht es Deiner Tochter besser?"

user139252

I was just asking "Is she better?"

@A.B. Geht es Deiner Tochter besser ?

user139252

3:13 PM

Not, "did she get better?"

@HeatherBrown Sorry =)

@HeatherBrown Yes, thank you =)

user139252

I know what I'm saying :P

@A.B. Good to hear this ! :)

@A.B. paste.ubuntu.com/13502961

@HeatherBrown But that nobody understands in Germany.

=)

@HeatherBrown Sorry, I'm an idiot =)

user139252

3:15 PM

No you're not.

user139252

Now I feel sad, and like a horrible person.

user139252

I'm a horrible, sad person.

@HeatherBrown Better than being a sad, horrible person.

@HeatherBrown Noooo

user139252

Also... I GET THING EXPLAINER LATER TODAY! :D

3:16 PM

@HeatherBrown Can't believe it ... really ! :)

@cl-netbox Purple rain?

user139252

I preordered on Amazon

@HeatherBrown You are a great woman. Perhaps sad, but not horrible. =)

user139252

and we have a distribution center about half an hour away from my home.

@kos not better

=\

3:17 PM

@ByteCommander NO ... The Rain Song - Houses Of The Holy ! :)

Hmmm... Don't know.

I love 100dd

@ByteCommander LED ZEPPELIN ... 5th studio album ... Robert Plant ... Jimmy Page (best guitar wizard ever) ... still don't know ? :)

@HeatherBrown Sorry, I did not want to annoy you.

@A.B. I think she knows this :)

3:20 PM

@cl-netbox :\

user139252

I am not annoyed :D

@A.B. she's just kiddin' ... :)

@cl-netbox Yeah, that is one beautiful tune.

user139252

I was showing my co-workers Thing Explainer.

user139252

I think everyone needs a copy.

3:22 PM

@terdon AAAHHH - someone of THE KNOWING people here ... nice !!! :)

@A.B. I'm a fool, I was so focused on not making errors while parsing that I forgot to take care of missing lines. :| here: paste.ubuntu.com/13503024

@kos testing ...

@kos ok, I had deb archive.ubuntu.com/ubuntu wily main in my list

after starting your script I have ...

@cl-netbox Sorry, no...

% sudo ./apt-add-update enable security
[sudo] password for aboettger:
deb http://archive.ubuntu.com/ubuntu wily main
deb http://archive.ubuntu.com/ubuntu wily-security main universe restricted multiverse #Added by script
deb-src http://archive.ubuntu.com/ubuntu wily-security main universe restricted multiverse #Added by script

But I can't listen to it now anyway...

@HeatherBrown What is a "Thing Explainer"? o.O

user139252

3:29 PM

@ByteCommander Randall Munroe's new book

@kos I would have expected deb http://archive.ubuntu.com/ubuntu wily-security main #Added by script

@A.B. Yes, that's what I meant it to do. Is there something wrong with that?

and deb archive.ubuntu.com/ubuntu wily main

@kos I'm sorry if I expressed myself wrong.

=\

Looking...

@kos Are you angry now?

Q: Samba system calls for reading/writing files from/to NAS issued from Windows desktop client

3:31 PM

0

Windows desktop machine is connected via 1GB Ehternet cable to personal NAS (under development) with Ubuntu on it. While reading and writing files (> 1GB size) from/to NAS strace was conducted to monitor samba process system calls, due to the fact tha samba is the one which is doing hard work. B...

linux ubuntu samba io

edward torvalds

hi guys o/

anybody arch linux user here?

@edwardtorvalds me

@A.B. So you want the components to be enabled based on wily? Ok I can add that easily if you want, however watch out that this is not exactly what software-properties-gtk does; software-properties-gtk leaves the old components as they are if you don't explicitly click on them

edward torvalds

@terdon shall we continue here or make another chat?

@A.B. No, not at all. :D why?

3:33 PM

@edwardtorvalds Depends on what you need. If it's short, here, if not we can take it to U&L

edward torvalds

please come on U&L

@terdon chat.stackexchange.com/rooms/31752/room-for-terdon-and-edward

@A.B. Or not. Let me check again, I can't stand software-properties-gtk, it's not consistent at all, maybe I confused myself. However you tell me, if you want it to act like that there's no problem, I can fix that

3:55 PM

@kos Some examples: paste.ubuntu.com/13503256

@A.B. Ok, perfect, I can quickly fix that. The only edge case is when you don't have a wily (without -security, -updates, -proposed, -backports) in your source (i.e. I don't know what components I have to add to the new entry). I guess you want them all in that case, right?

The distribution does not matter.

The thing is the repository. Another example ...

% cat sources.list
deb http://archive.ubuntu.com/ubuntu wily-security main

% sudo ./apt-add-update enable updates
deb http://archive.ubuntu.com/ubuntu wily-security main
deb http://archive.ubuntu.com/ubuntu wily-updates main

@kos ^^^

the trigger is the repository

Therefore we need also a sudo ./apt-add-update enable

yes, now I have a problem

deb archive.ubuntu.com/ubuntu wily-security main
deb archive.ubuntu.com/ubuntu wily-updates universe
deb archive.ubuntu.com/ubuntu wily-proposed multiverse

If you run sudo <command> enable backports, what should it add?

@A.B. ^^

deb archive.ubuntu.com/ubuntu wily-backports main universe multiverse

find all enabled repositories, add each of them to wily-backports

@A.B. Ok, so as long as a component it is mentioned in at least one distribution entry it should be added. Last question, if /etc/apt/sources.list is empty should I add them all? ;)

4:09 PM

No, do nothing

Ok :D fixing that

another thing, how can we enable/disable deb archive.ubuntu.com/ubuntu wily main

sudo <command> enable ""

or simply with sudo <command> enable

@kos ^^^

need a break, brb

KGIII

@A.B. Thanks (col as INT)! Was that what @NathanOsman needed to get himself sorted with his DB sorting?

@KGIII No idea :\

KGIII

LOL Oh well... I'm absolutely not a DB guy. For some reason, I just can't get my head around it. I can do basic things like joins, additions, some sorts (with practice) in MySQL and, once upon a time, with Oracle. However, I can't even make my own spreadsheet macros.

4:16 PM

@A.B. <command> enable default? If you consider the other distribution as extra it kinda makes sense

default sounds great

Ok. Anyway if you change you're mind it takes a second to be changed ;)

@kos I will add some examples to the question

@A.B. Ok, I think I got it this time, but maybe for the others

Anyway if there's a mod around, here's a totally pointlessy aggressive comment: meta.askubuntu.com/questions/14665/…

4

xD

cc @NathanOsman @Mateo @Seth

Seth

4:31 PM

haha

Man, this webcomic is amazing

xD

Is there a prename command in Ubuntu? The default rename points to perl-rename but is there also a command called prename?

% ls -l /usr/bin/rename
lrwxrwxrwx 1 root root 24 nov 10 03:39 /usr/bin/rename -> /etc/alternatives/rename
% ls -l /usr/bin/prename
-rwxr-xr-x 1 root root 2987 mag 14 2015 /usr/bin/prename

But more importantly man rename = man prename, so /etc/alternatives/rename points to prename

@Seth Could you take a look at this? I think it's quite aggressive: meta.askubuntu.com/questions/14665/…

@Serg @kos I have added some examples. :\ askubuntu.com/q/700860/367165

intex

4:53 PM

@terdon Connection to this site is not secure means I am using dummy site

@A.B. Ok, I have to rewrite a big part because of the server thing. :|

@kos Yes, that's what I would expect. What'd the output of readlink -f /usr/bin/rename?

@intex Huh?

@kos I think I have to increase the bounty.

@Serg are the new examples a problem? If yes, I could add a note to your answer.

% readlink -f /usr/bin/rename
/usr/bin/file-rename

That's odd. So what's prename then? Grr, I'll have to boot my VM and check.

4:59 PM

@terdon And the weird thing is that if I meld prename and file-rename I get two not identical but quite similar script.

Q: What's with all the renames?

Ah! Yes, OK, that might explain it. Hang on.

8

On my Debian system (well, my LMDE system, but close enough), I have at least 3 different rename programs: /usr/local/bin/rename : This is a Perl script, written by Tom Christiansen. Oddly enough, I can't seem to find which package installed it: $ dpkg -S /usr/local/bin/rename dpkg-query: no ...

debian perl rename

OK, prename is installed by Perl. I forgot that :)

Alright, that explains it. :)

@A.B. You can't unless you want to add another one later, however IMO 250 is fine for that

@kos Yes, I can add another, later =)

@ByteCommander What's about you? =)

@A.B. Back to that thing. I've spent more than 1 hour on that only today. Not to say you should add another bounty, again, 250 is perfectly fine, if not too much. The problem is I'm about to hate that script.

@kos =\

But you're right. It's not simple. :D

5:11 PM

@A.B. You mean the add-apt-updates script? Not sure if I'm going to start that...

@A.B. No. :). I think I've modified it to the same extent as if I had written it three times from scratches.

@kos You can believe me ... I really understand it ! =)

@cl-netbox In general? Or are you writing a script for that as well?

@kos OMG ... NO ... beware ... =) :D ... I understand that you are about to hate this special thing ... HaHaHa ... :)

@cl-netbox :). Yeah, it's not one of those script that you can start writing without thinking about it well, or you risk to have to rewrite it from scratch.

5:23 PM

@kos =) yes my friend =)

@A.B. At the very least I can reuse the function to scrape /etc/apt/sources.list I had before

Hello, all. I need some help with RHEL before posting an intelligible question. Am I in the right place/not interrupting?

@kos I hope, yo're using Git =)

There's one thing for sure : all you guys @A.B. @kos @Serg are definitely the best candidates to earn the EXCITEMENT BADGE for this ... and if this doesn't exist, please ping a mod and ask him to invent it !!! HaHaHa ... :) =) :D

@cl-netbox :D:D:D:D

@KevinBrown RHEL is wrong here, sorry. =\

5:27 PM

Shoot. @A.B., where to go?

@KevinBrown But your avatar is nice =)

Q: Ubuntu: Process vfs-worker taking all CPU resources

0

My Cloud9 (Ubuntu-based cloud IDE) began to be unresponsive after I tried to save some files. It shows 100% CPU utilization and a process that takes all CPU power. The process name is: vfs-worker {"pi and it seems to be associated with the IDE (after killing it it displays Reconnecting... messa...

ubuntu process django mongodb virtualenv

@KevinBrown or to hell ... ask for the devil with the red hat ... =)

Thanks, @A.B.

@KevinBrown yes, ask @cl-netbox

5:28 PM

@A.B. NOOOOO

@cl-netbox, ya...I hate RHEL.

=)

Hey it's getting cool ... nice =)

BRB

Terrance

5:37 PM

@Terrance But at least it has the best graphics! >:D

Terrance

@ByteCommander Indeed! =)

@kos Thanks for touching base Kos, not sure if you get this message, I'll try again in any event. Chilli is working the problem, unfortunately I just left town for the week, your generous bounty will expire before I return, the problem seems to exist only on my home network. Thanks, desi

@KevinBrown Okay ... getting serious ... @Terrance and @terdon are two of your your best choices to getting help with RHEL. :)

kos are you here? Looks like you have a lot going on.

@dharamija I'll award the bounty to chili555 in any case anyway, since they indeed made a great effort and anyway added tons of useful information, and as I understand also narrowed down the problem. Let's see what happens. If chili555 is willing to keep following up on that issue we'll leave things like that. Otherwise I'll throw in another 50. Don't worry about it, if that's a bad difficult to solve issue it's better be solved for the sake of anyone using a configuration similar to yours.

5:48 PM

thanks. I'm confident he will find the answer. I've learned a lot through the process, and like you said he's honing in on the answer.

xD

funny

@RPiAwesomeness IE Justin Bieber edition? o.O That's bad programming combined with bad taste... :P