/dev/chat

slm

00:00

8-)

We also show you how to contain it for testing purposes

terdon

@slm should we merge that one with this?

21

Q: Where is the fork() on the fork bomb :(){ :|: & };:?

Warning: Running this command in most shells will result in a broken system that will need a forced shutdown to fix I understand the recursive function :(){ :|: & };: and what it does. But I don't know where is the fork system call. I'm not sure, but I suspect in the pipe |.

slm

9

Q: Difference between executing multiple commands with && and ;

What's the difference between executing multiple commands with && and ;? Examples: echo "Hi\!" && echo "How are you?" and echo "Hi\!"; echo "How are you?"

bash shell

Ramesh

Is it limited by setting the limits in /etc/security/limits.conf file? I want to answer without googling :)

slm

@terdon - nah 2 different Q's

terdon

@slm Oh, yeah, we went over that once already.

slm

00:03

twice now 8-)

terdon

blush

Tyler Maginnis

The worst Q's are pattern matching.

What a waste. It's an answer that will probably only help the user asking it... except in certain context.

terdon

@TylerMaginnis Yeah, they're very hard to generalize.

But, they do show some general principles. I've seen people take my answers and apply them elsewhere.

Tyler Maginnis

I use awk, sed, grep... head and tail... but I try mostly to use sed.

terdon

I use perl for sed usually. Unless it's very short. I;ve been meaning to really learn sed but I have never really needed to. Perl can do anything that sed does.

Tyler Maginnis

00:09

My favorite grep is... $> grep -of \{0,0\} $match\{0,20\}

Matches chars before and after pattern

** grep -o

I get my hands dirty with systems that do not have perl.

POST compatibility through using only standard she'll utils.

Posix**

Ramesh

@terdon I use it generally from your canonical question/answer :)

slm

@TylerMaginnis That's partially true. They need to be written as if you're teaching someone how you went about doing it. Also explaining the method of how it works is extremely useful. I've searched for things and many times have found those same Q's and the A's have been very helpful in understanding something that had nothing to do with the specific Q.

terdon

@Ramesh Ah, cool, I'm glad that's useful.

slm

@TylerMaginnis terdon and I have tried to take those Q's too on several occasions and provide as many methods as we can conceive of. It's basically a programmers game of tying 1 hand behind your back and trying to do X

Tyler Maginnis

I made a monstrosity of regular expressions a few days ago...

Ramesh

00:13

Will calculating subnet mask/gateway be a good topic for our site?

Tyler Maginnis

30 $env variables parsed by 4 to 16 pipes of regexp.

slm

@TylerMaginnis You should also fancy yourself a purveyor of many paths to a single solution.

Tyler Maginnis

the theory was that if I um.. do things in little steps... it'll be more accurate.

Ramesh

I feel if I understand the basics more, I can understand the network setting up in KVM and things.

Tyler Maginnis

@Ramesh

terdon

00:14

Actually, is there a collective term for all these things? ;,&,>, >>, | etc. I'd call && and || operators but what of the others?

Tyler Maginnis

@Ramesh faikvm.com/?g=machines/vmlist this is an implementation of our "FaiKVM"

It's interesting from a feature-perspective. Enables Fully-Automatic-Install KVMs.

slm

I was trying to find the term I saw them called the other night. There are 5 that are considered X. Terminators? It was on the bashwiki (one of them)

Tyler Maginnis

Kinda like Docker in that you can build recipes.

slm

I think it has SC's hand on it too

@TylerMaginnis what's this referring to?

Tyler Maginnis

KVM and networking @Ramesh.

slm

00:15

be sure to reply to a specific line in chat, so others can hover and know what you're referring to.

Tyler Maginnis

@slm The implementation of FaiKVM is a software project based on KVM that is deprecated because it is not something that the maintainers have time to work on anymore... But networking is a part of it, as well.

slm

KVM doesn't necessarily have recipes, you configure things in an .xml file or via virsh or virt-manager.

Ramesh

@TylerMaginnis Thanks. I saw the Iptables rules construct site from one of your comments too. It's good.

However, I want to understand the basics first :)

Tyler Maginnis

@slm @Ramesh linuxpmi.org/trac/wiki/FaiKvm This is the page for the FaiKvm. It's pretty tricky to track down a DVD-iso of it, but I'm sure it's out there somewhere still.

Ramesh

I sort of know things but do not know like know things.

Tyler Maginnis

00:17

FaiKvm is not the same as KVM. It's extended features to deploy KVMs on-the-fly.

So it's a whole "distribution" oriented method to extend features of KVM.

I'm still waiting on IPTables-Next.

^^ By that I mean IPv6 implementation of IPTables by netfilter team to be really stable.

Ramesh

@slm, @terdon is sub net mask and networking concepts on a broader perspective be on topic here?

slm

I think they can be

Tyler Maginnis

Well, if it is a question about the implementation of the Linux Network Stack, I think so.

I have been pretty deep into the stack used by the Open-Source Provider R&S suite, StarOS.

slm

as long as you're showing examples using ip dig etc. then it's perfectly fine

Ramesh

@slm, thanks. I will try to frame it in a decent understandable Q/A format so that it will be useful.

slm

00:23

@TylerMaginnis not familiar with those. What are they?

Tyler Maginnis

@slm StarOS implements Quagga, the Open-Source implementation that includes Routing Protocols.

@slm nongnu.org/quagga

Internet Service Providers use it. Particularly smaller, backwater ones that operate in the country. They run it on their tower-boxes.

It is syntactically, 90% similar to Cisco IOS.

slm

ah

Tyler Maginnis

I'm not even sure what the state of the project is these days.

I was just as surprised as you when I found it.

slm

@terdon - the bash cheatsheet is where I saw these mentioned

mywiki.wooledge.org/BashSheet

terdon

@slm I found out they're all operators of one sort or another.

slm

00:33

@terdon - yeah but I seem to remember an actual name for 5 of them

terdon

gnu.org/software/bash/manual/bashref.html#Lists

slm

; | & were definitely called something

I think they're part of the subshells

or sub commands

terdon

This is from the bash manual:

> A list is a sequence of one or more pipelines separated by one of the operators ‘;’, ‘&’, ‘&&’, or ‘||’, and optionally terminated by one of ‘;’, ‘&’, or a newline.

slm

since you're running in a different process when you do cmd1 & cmd2 or cmd1 | cmd2

terdon

@slm:

> control operator
A token that performs a control function. It is a newline or one of the following: ‘||’, ‘&&’, ‘&’, ‘;’, ‘;;’, ‘|’, ‘|&’, ‘(’, or ‘)’.

slm

00:39

ah it's in the bash man page, forgot to look in there 8-)

in the definitions section

good call

@terdon

and yet more home work

0

Q: How to match a number in one file to a name in another file?

Okay, I hope this is the right place to ask. I have 2 files. The first file has 4 fields: class CRN #, Instructor ID #, Class Section #, Number of Students. Example.) 0002 T00005 006 15 0004 T00004 012 26 . . etc The second file has 6 fields (as best as I can tell): Instructo...

awk grep uniq

Braiam

00:53

@slm ahhh.... September...

btw, more unix.stackexchange.com/q/159504/41104

terdon

Seriously?

Must you do that in a shell script? You could do that in about 5 lines of a real programming language such as Python. — Greg Hewgill 5 mins ago

He should know better. 5 lines for that is ridiculously long.

Well, not if it's also doing the HTML I guess.

Argh, never mind, I completely misread the question. I thought he just wanted this:

$ echo "XSAMPLE" | fold -w 1
X
S
A
M
P
L
E

slm

WTF, this is getting ridiculous

@jasonwryan - I concede you were right 8-). Best not to help them.......

terdon

I'm not sure what to do with this one:

1

Q: How to write this pseudocode where condition

This question is extension of this question about listing questions of directories. I get a problem that I need to understand the original section of the text. Current output where you see the second question does not make sense. It was included in the subsection Takayasu arteritis in the ...

text-processing scripting perl latex

He has tried. And is playing by the rules. I don't think he's a vampire as such.

slm

@terdon tex.se.com?

terdon

@slm Nah, it's a parsing problem, his tex is fine.

slm

01:02

k

terdon

I'll answer. It's just that what started as a simple little bash thing is getting more and more complex.

slm

yeah I hate when that happens. That's how every perl program I've ever written starts out...as a Bash script 8-)

terdon

And guess what I've decided to do as an answer :)

I think this type of Q is still OK. Borderline but OK:

2

Q: To write this Pseudocode with Regex

I am doing a Makefile which I run regularly by Crontab every day at 0230 crontab -e; 30 2 * * * /bin/thePseudocode Python-like Pseudocode directories = ["Cardiology", "Rheumatology", "Surgery"] for directory in directories files = directory.files(); % not sure if such a parameter exists ...

terminal cron regular-expression python make

He put a lot of effort into it, not just "CODEZ NOW".

slm

yeah those are ppl you wanna help

Tyler Maginnis

I used to do a dozen other people's jobs randomly for an hour a month in exchange for $75.00/hr.

((75*12))=$900

terdon

01:07

Great. Now I feel like an idiot. @slm do you realize that he was getting paid for this kind of shit?

Tyler Maginnis

Sometimes I look back on that and I think how inappropriate it was to be running around other people's enterprises.

They'd give me direct RDP, SSH, etc.

slm

@terdon the pseudo guy, or tyler?

terdon

Tyler.

2 mins ago, by Tyler Maginnis

I used to do a dozen other people's jobs randomly for an hour a month in exchange for $75.00/hr.

Tyler Maginnis

It's tricky to find good clients anymore. I might have a gig on the horizon, but it's just reshipping parcels from a factory in Thailand, because I have a U.S. address, and I know the guy well enough to where I know it's not a scam.

Part of me is hoping that by contributing this site, I will eventually receive a request to solve problems in exchange for currency, but I am sure that rarely happens, if at all.

terdon

@TylerMaginnis I got headhunted by google based on my account here.

So you never know.

Goes to show how much big brother really knows. I'm a biologist FFS!

Tyler Maginnis

01:12

Just one more place to showcase what you can do is never really a bad thing.

My favorite subject in biology is comparative morphology.

slm

Yeah I wouldn't do those types of jobs if I were you. Better to build yourself an actual reputation as a solid community member and provide solid answers. Employers will snap you up if you're qualified and have a proven track record.

Braiam

there you go, answered a question on AU :(

slm

Just be sure to vent in here and not so much on the comments of newbies that are asking Q's.

Braiam

I couldn't resist seeing everyone using the wrong approach

slm

which Q?

Tyler Maginnis

01:15

@slm if I want to verbally berate people, SDF's, "pcom," mode has a couple 14 year olds that talk some serious smack to me, and I bring it right back to them.

slm

I'm stuck trying to decide if I want to help george w/ another 1 sentence Q.

Braiam

one in the hot list

slm

@Braiam - nice

Braiam

guy want to imitate nautilus unmount/safety eject behavior yet all the answers needs root permissions

slm

On a positive note, the site should be breaking 50k Q's sometime this week.

that's nice milestone

terdon

01:20

Speaking of milestones, you should be hitting 100k sometime this week too. Or shortly thereafter, yay!

slm

yeah...looking forward to that. Curious to see what SE sends you if anything.

Braiam

@slm lets hope nothing breaks when we reach 50k Q's

slm

@Braiam - that's pretty funny. Notice our buddy there too: meta.stackoverflow.com/users/128967/naftuli-tzvi-kay

terdon

02:18

Phew, OK, done.

0

Q: What do all these symbols (|, ||, &, &&, >, >>, etc) mean after shell commands?

I often see tutorials online that connect various commands with different symbols. For example: command1 | command 2 command1 & command2 command1 || command2 command1 && command2 Others seem to be connecting commands to files: command1 > file1 command1 >> file1 What are these things...

bash shell

slm

you want to run all those others into this one as dups now?

@terdon^^^

terdon

Maybe, what do you guys think?

I'd let it simmer for a while, get some votes on it, just in case I'm missing anything obvious.

If everyone agrees, then yes, I think that one collects pretty much everything all those others were asking.

Tyler Maginnis

02:37

(ow ow ow) the new display managers always cause me great anxiety. This is easier to use. Undecorated windows.

Hotkey-controlled window control. I don't even need a mouse.

^ mistakes like that in my grammar tell me it's time to go to bed.

tldp.org/LDP/abs/html Have any of you run across this before?

slm

@TylerMaginnis yeah, all the references to S.C. in it are the #3 user here.

Tyler Maginnis

I notice that a lot of users I recognize from other spaces Online aggregate here.

I spend a lot of time on LWN.Net, as well. It's my morning coffee companion reader.

0

Q: Ubuntu Software Center Problems

had Ubuntu 12.04 LTS running completely well on my x-64 system. Last week I upgraded my OS to 14.04 LTS. Since then my Ubuntu Software Center is not running. Even I am not able to download packages from the terminal. Can anyone help me out with that?

linux ubuntu

facepalm why is anyone running 12.04 LTS? ohhh, it's because Ubuntu incentives deprecated versions, because they "support" binary blob drivers from graphics vendors.

so you get your old'buntu with an old'kernel. but when you dist-upgrade... oooooooh

I wonder why so many things break when you go from 12.04 to 14.04

^^ mocking the obvious. I'm telling him to reinstall.

Tyler Maginnis

03:11

0

A: How can I get difference ratio using “diff” or other command?

Hm... I actually want to help you today. #!/bin/bash # File 1 contains 1,2,3,4,5 on new lines # File 2 contains 1,2,3,4,5,6,7,8,9,10 on new lines. diff -y 1 2 > diff # Compare differentials side-by-side sed 's/[ ]/d' diff > MATCHES # Print lines to file which do not contain ">" prefix. sed '/[>]...

ahahahaha, @slm

@slm

Everything is a file, right?

is a Ratio a thing? Like a "0.40"?

Am I just dumb at math?

Anthon

05:28

@terdon Sorry about that. I have had that quite a few times, seeing that a new answer got posted before I was finished with something too similar to post. Strange thing is that that upvote only got me +3 points, maybe because I was over 200 rep gain?

Braiam

10:09

@Anthon yup

slm

11:10

@Anthon yup welcome to the diminishing returns @ 200. See if you can get to 300 now 8-) in a day. You have to do it with all accepts after 200

@jasonwryan - asking in the AU chatroom if they want this Q migrated.

-1

Q: Ubuntu Software Center Problems

had Ubuntu 12.04 LTS running completely well on my x-64 system. Last week I upgraded my OS to 14.04 LTS. Since then my Ubuntu Software Center is not running. Even I am not able to download packages from the terminal. Can anyone help me out with that?

linux ubuntu

Anthon

@slm The "problem" maybe went away as one of the questions I answered got moved to SO getting my points for the day below 197

Braiam

@slm don't, the question as it poses is unclear

slm

11:48

@Braiam Yeah I didn't want to since it's a not overly well written Q, but I asked them anyway.

slm

13:59

everyone else get kicked out of the site?

Braiam

nope

slm

weird one system I cannot login to site, other is fine

Faheem Mitha

14:52

@slm Why do you say that?

slm

@FaheemMitha - my one browser is unable to login, seems to be a caching issue.

@FaheemMitha - had to clear all my cookie data from the beginning of time to get back in

I use verisignlab's pip openid. Not sure if that was the issue, oh well.

Tyler Maginnis

0

A: Propagate multi touch events to applications

LWN.Net Xinput Multi-Touch History This is the history of the xorg-multitouch extension. It touches on gestural programming, and references the uTouch Gestural Programming project. These two informative articles are good source material, and should give you the momentum you need to get started....

Acceptable Answer or not?

Braiam

@TylerMaginnis do I need to click the links for the howto?

Tyler Maginnis

Those aren't how-tos.

Those are 10~ page historical documents on the state of the art for what the user is asking which will give clarity I cannot.

slm

@TylerMaginnis - it's a good start, is there a command that you can provide him that will let him see the events as they're seen by UDEV or the kernel? That sounds like what he's really after.

Braiam

15:05

do you explain why?

Tyler Maginnis

Hmmm. I think I might have that up my sleeve. Editing now.

slm

@TylerMaginnis - as it stands this is borderline a link A

If you look at Gilles, Stephanes, or Mine or Terdon or any of the other front page users' answer you'll see fairly long form "tutorials" on a subject matter. We generally strive to have this type of content here.

It's def. not for the faint of heart but we try and discourage 1-2 sentence A'ers.

or links. There are times when these are all that's relevant, but on a Q like that there's a lot of room to provide guidance to this user, since they don't know what directions to go, you're essentially the tour guide, showing him the path as you'd take as the developer

Braiam

@TylerMaginnis a good answer to that question could be: no, standard linux libraries do not have multitouch event capabilities, because X and Y reason, for that you need foo library, but such library do not have Java equivalents because bar

note: I have no idea of what was said above

terdon

Yay! I just replaced Chris Down as the 4th top rep user today! Watch out @slm you're next! Right after I plow over Stéphane.

Ramesh

This should be closed, right?

slm

15:10

Yes Braiam's point is an excellent one too. Often times ppl don't have the foggiest idea how to approach a solution so they're throwing many things at the wall, some relevant some not, so you can negate things that they've listed and explain why w/ references as an A and then provide the path but not necessarily spell the full solution out tooo.

Tyler Maginnis

I revised it.

terdon

@Ramesh Yup. Done.

slm

ah terdon beat me to it, @Ramesh - yeah that's crap

Ramesh

@terdon Thanks.

Braiam

man, I'm not even in the quarters page... only in the yearly

Ramesh

15:12

@terdon, you use Ubuntu 14.04 right?

Braiam

@Ramesh nope

slm

@Braiam get on the A horse 8-)

terdon

@Ramesh Huh? No!

Braiam

I think only Gilles does

terdon

I have one in a VM though.

slm

15:12

gilles has overtaken me in every category except year

I'm hanging on by a thread

Tyler Maginnis

@Braiam I like your reccomendation, and added a paragraph to describe how I will deliver.

Ramesh

How do you connect to the network in the VM?

slm

@terdon I"ve been so busy with learning new stuff myself that my time has dwindled here.

@terdon - but I'll have a whole new source of material to dump soon enough 8-)

terdon

@Ramesh Bridged mode, I'm using VirtualBox and it worked pretty much out of the box.

slm

@Braiam what's this in response to?

Braiam

15:15

@slm my previous line "nope"

Ramesh

@terdon ok. I should have phrased the question better. Is your host machine's connection wireless or wired?

slm

ok back to learning more about ruby, solider on

Tyler Maginnis

Hard to drill down on an answer when there are 4 type of commands and 6ish commands per type that could be useful, depending on what dist someone is using.

terdon

@Ramesh wireless.

Ramesh

@terdon Thanks. Do you face any connectivity issue with Ubuntu? I mean, getting disconnected every half an hour or so?

terdon

15:19

No, but I don't really use it either. I only have it to answer questions on AU.

What you describe is a classic issue though. It is usually fixed by using a different driver for your card.

Tyler Maginnis

@Ramesh my Debian unstable has been having iface connectivity issues... It drops, hard. Are you talking about Wireless or Wired?

@terdon

is right. it's usually the driver.

Ramesh

I tried that. But unfortunately it did not work.

I had posted it in AU as well.

@TylerMaginnis It's wireless.

Tyler Maginnis

$> dmesg | grep wlan

Find out if you have a 'RealTek' 'BroadCom' 'Atheros' Chipset

To find out why this is happening, generally if you can correlate your chipset to what driver you are using, you can find out what exactly is going wrong.

terdon

@Ramesh add the output of ` lspci -nn | grep 0280` to your question. What is the VM using as a wireless device?

Ramesh

@terdon It is a host machine not on VM.

Tyler Maginnis

15:24

ohh. I misunderstood.

Braiam

@Ramesh please, do not crosspost

Ramesh

Will the connectivity issue occur because I configured the network using /etc/network/interfaces rather than using network manager?

@Braiam I have not cross posted.

And I know the rules of SE.

Braiam

@Ramesh ah, ok, I read that as "I posted here and in AU as well"

btw, when you get disconnected, add the output of dmesg | tail

Ramesh

@Braiam curse my poor english skills :)

@Braiam sure. I will just wait for it to get disconnected now.

terdon

@Ramesh OK, but the hardware details will be needed to answer your question.

Anthon

15:30

Should I recommend a hexeditor?

0

Q: Add codes to vmlinuz

When i use vi editor to add some codes to /vmlinuz I see it in a bad format.It seems a binary file. I am going to improve security and add extra steps for checking password. How can i edit vmlinuz?

bash

Ramesh

@terdon added the details to the question.

Anthon

Or better a disassembler and assembler?

:-)

Tyler Maginnis

Um. I would recompile and rebuild vmlinuz.

Braiam

@TylerMaginnis exactly my point

@Anthon those questions reeks to XY problem

Tyler Maginnis

Sounds like getting the old hands too dirty . One he away from never rebooting again.

Hex

Ramesh

15:34

@terdon, should I use inxi command to get the hardware details or lscpu is fine?

Braiam

ok, is official, I hate my country educational system, from top to bottom

terdon

@Ramesh May as well show both. The inxi will show the driver you're using and the name of the card but lspci will show the code (e.g. 14e4:4353).

Braiam

or just lspci -d 8086:008a -k

terdon

Replace 8086:008a with your card's ID.

Or just use:

lspci -d $(lspci -nn | grep 0280 | grep -oP '\[\K[^]]*:[^]]*') -k

Ramesh

@terdon pasted the output.

@terdon, I am going to try this option now.

Ramesh

15:59

Another escapee from the past still wandering happily.

terdon

16:32

@Ramesh What's wrong with that one? We've never decided that software requests are off topic here.

Tyler Maginnis

0

A: Efficient todo / project / task manager application

TracWiki: Project Management System TracWiki is a light-weight project management wiki-portal which runs over HTTP ports. Install Guide Light-Weight Easy Setup Modular (Multiple Projects) Hot-Copy Backups On-The-Fly Non-Invasive (Standard Wiki Formatting, similar to StackExchange Markup) Ti...

I'm surprised nobody suggested a Lightweight Wiki Platform, like Trac, for this requirement.

Ramesh

@terdon Actually, it's because it would be primarily opinion based.

Tyler Maginnis

"once you go tracD, you never go back"

Patrick

@terdon Agree with @Ramesh, opinion based

terdon

Hmm, yes. I guess it is at that.

Faheem Mitha

16:39

@slm I see. Which caused confusion, I guess. Unlikely everyone would have gone away at once, though.

slm

@Ramesh Agreed, VtC.

Tyler Maginnis

16:58

Ever consider recursively scraping the forum for opinion based questions?

Nevermind. Harder than it sounds to identify keys.

Braiam

@TylerMaginnis yes, there are people that does

check this room chat.meta.stackexchange.com/rooms/773/low-quality-posts-hq

yep, a simple question in AU yet 3 wrong* answers

Patrick

17:18

@Braiam 3? All 4 look wrong to me.

Braiam

@Patrick note the "*"

I know muru's A has something fishy but I don't know what

Patrick

There's no footnote. I do not know what '*' means

terdon

Cool, I got a perfect sequence of rep:

Almost perfect anyway.

Patrick

@Braiam It, and all the others claim load is the # of procs waiting on CPU. Load is the number of procs waiting on hardware resources, not just CPU.

you can't just say "if load > X * nCPU then your system is overloaded"

slm

I think they're confusing the ready to run queue w/ load, which is where the load # comes from.

Braiam

17:24

@Patrick yep, that was it

check the comment askubuntu.com/questions/532845/…

Patrick

@terdon No "+15 accepted" :-)

slm

boo

terdon

boo indeed :(

slm

So now see how many +15's you can get before 8pm EDT.

I think the best I've ever been able to do is 9

maybe 10, I forget

terdon

17:50

@Patrick Happy now? That totally screwed up the nice ordering :P

Ramesh

@terdon If I upvote, you won't get those points now?

terdon

@Ramesh Yup. No more rep today except for bounties and accepts.

Ramesh

@terdon ok, I will wait till tomorrow then :)

terdon

Thanks :)

Ramesh

Wow, I did not know there can be 2 users with same name.

terdon

18:01

Many actually

Try looking for "john" on Stack Overflow for example.

Ramesh

Wow page 5 has all johns with 0 rep.

oops, that was weekly.

Sorry all johns.

Faheem Mitha

18:28

@Braiam Did you spend much time in it?

And what is the context?

@derobert ever considered going to a ComicCon?

slm

@terdon gotta have at least 1 accept 8-)

@ramesh - Yeah you can change your name too, as goldilocks found out when they were doing the hats thing

Ramesh

18:43

@slm should probably change it to stephane, the man who found shellshock :)

slm

I don't think he cares for bragging rights too much.

Gilles

Note that you can only change your name once per month (if you change your name, after a few minutes, your choice becomes locked for 30 days)

Ramesh

I am not a fan of changing name though. I have made the U & L user account as my home page in my LinkedIn profile.

slm

@Gilles yes that was the oops that goldilocks made

Braiam

@Ramesh it doesn't matter, it just take your ID

ryekayo

19:04

Would anybody be able to help me out with a regex in java

Braiam

@ryekayo would you just write your question and then we can decide?

ryekayo

Well its not exactly Unix/Linux related, it will be migrating to the LINUX after I am done though

the project willl that is

slm

@ryekayo If it's java put it on SO

If there is anything Linux related to it you can ask that as a separate Q later on and link the 2 so they're shown to be related.

ryekayo

ok

Gilles

20:12

@terdon I edited your answer. I'm not sure if classifying ; & && || | according to their syntactic category is the right thing here, maybe it should be the sequential operators ; && || vs the parallel ones & | ?

terdon

@Gilles Yes, thanks. I think that's a clear improvement. I like the list terminators being separate from the rest for example.

I don't think that ! is a control operator though. At least, not according to the bash manual.

Gilles

@terdon technically, it's a reserved word, but I don't think the distinction matters here

terdon

Yeah, I didn't really want to go into fine details. I was aiming for a cheat sheet.

G-Man

21:08

I missed the starting gun. Are we submitting questions that might be duplicates of the new “What are the shell's control and redirection operators?” canonical question? Here’s one that popped up just a few days ago: When is 'if' not necessary?

slm

@G-Man - no starting gun was fired. Use the normal methods of flagging it as a potential duplicate and then let it run it's course through the review queue. You can always mention it here too to help get more eyeballs on it as well.

terdon

4

Q: Canonical question about shell operators

A few of us were discussing the fact that information on the various shell operators is spread across multiple Q&As. For example: Is there a difference between `;` and `&&` and `|`? redirection and pipeline Confusing use of && and || operators Difference between > and | with /dev/tty How can on...

discussion canonical-questions

Braiam

anyone sees something missing in the btrfs question?

terdon

22:10

Don't we have a good duplicate of this?

0

Q: find files in folder newer than

I searched through man find but it doesn't give me the answer to a simple task: I want to list all files inside a folder that were modified during the last 5 hours. I tried find ~/.purple/logs -type f -mmin 1000 to show modified files during the last 1000 minutes, but no hits. Maybe it's m...

find

The best I can find are this:

5

Q: Find files which are created a certain time after or before a particular file was created

I need a shell script which finds files which are created 1 hour before or 1 hour after a particular file (test.txt) was created. If I go with find -newer, that means I'd have to create a temporary file, use touch to change the time on that 1 hour before the creation time of the test.txt file, ...

shell shell-script find date

But that's with respect to another file and this one:

14

Q: How to list files that were changed in a certain range of time?

How can I list recursively all files that were changed between 22.12.2011 and 24.12.2011?

files recursive timestamps

But that asks for a range. Don't we have a nice find -mtime answer?

Tyler Maginnis

22:36

0

Q: moving files to a folder and zip the folder

I used to zip a few files induvidually and move them to a different folder which included lots of steps. So I thought of moving those files to a new folder and move it to the intended folder after zipping the new folder. Is it possible to do it with few commands? suggestions are welcome

zip gzip mv

Ramesh

23:08

Is it possible to borrow points from one of my SE profile to use it in another SE profile?

I want to award bounty in askubuntu but I do not have enough rep over there.

Braiam

@Ramesh nope

Ramesh

oh bummer!!

I have no other clue for this one.

Braiam

@Ramesh report a bug...

Ramesh

@Braiam, sure but before that I still have one suspicion. Will it be because of some router setting?

Tyler Maginnis

Do you have an /etc/sysconfig/selinux file?

do a $> diff -y selinux_config_1 selinux_config_2

Ramesh

23:15

@TylerMaginnis, I have /etc/selinux/semanageconf file.

Tyler Maginnis

How many lines is it?

Big, right? SELinux has a lot of options.

Ramesh

41

Tyler Maginnis

not that big

I would use stream editing to make changes to semanageconf

18

Q: Insert a line at specific line number with sed or awk

I have a script file which i need to modify with another script to insert a text at 8th line. String to insert : Project_Name=sowstest in to a file called start i tired to use awk and sed but my command is getting garbled please help me out Thanks in advance

sed awk

Braiam

@Ramesh no, that is the driver fault, router has nothing to do with it

Tyler Maginnis

Insert lines into the file and refresh the config. Use the $> diff -y file_1 file_2 output to determine which lines are different, as I understand you only want to borrow specific lines.

Ramesh

23:17

I am downloading policycoreutils to have the sestatus command.

I probably will disable it. But still not sure why that might be an issue.

sestatus: disabled

I believe selinux might not be an issue.

G-Man

23:29

@terdon: Find a file which is 30 minutes old and Finding a file which created X minutes back (without GNU/BSD find) (which were asked one week apart by the same user) both discuss fine-grained time-based searches in find.

terdon

@G-Man Thanks, the first one is perfect!

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