4
votes
4answers
4k views

How can I extract/parse a complete URL from a semi random string?

I'd like to have bash parse/extract a full URL (and only the url) from a random short string. Examples: bob, the address is http://www.google.com or https://foo.com/category/example.html is up ...
1
vote
1answer
79 views

how to java set the PATH of my Debian 7.3 system ?to link the java version I want [closed]

If I insert into the terminal: aryan@localhost:~$ java -version java version "1.6.0_27" OpenJDK Runtime Environment (IcedTea6 1.12.5) (6b27-1.12.5-1) OpenJDK Server VM (build 20.0-b12, mixed mode)
0
votes
3answers
124 views

Terminal Root Command Warning

Is it possible to write a script (or change some file) in order to warn the user that they are using a command that is normally reserved for root? And if so, how? I'm currently the administrator of ...
1
vote
1answer
70 views

Debian web server inaccessible after moving VM

I have a dev laptop with Debian + LAMP as the dev env. We are using virtualbox and there are 2 network adapters : NAT and VB Host Only. I copied the VHD over to my desktop and setup the VM using the ...
3
votes
1answer
202 views

Making htop summaries respect --pid

I'm running this: $ htop --pid=3907,3940,3941,3947 and would like to make the CPU/Memory at the top only count those PIDs. Is this possible? Other questions Also, are there flags for: enter '...
1
vote
2answers
694 views

Script always runs two instances

I was just curious, what may be the reason why script run two instances when executed. Whenever I run my script foo.sh, and when I check using: $ ps -ef | grep foo.sh It always returns two ...
6
votes
2answers
3k views

What's the most efficient way to grep for two completely separate things and assign the values to separate variables?

CentOS 6.x I want to take the output from curl, grep for two completely separate strings, and assign their respective values as variables. What is the most efficient way to do this (without writing ...
2
votes
4answers
3k views

Cron not running my script

I'm not sure why but my app never executes when I reboot my machine. In crontab > crontab -e I see @reboot /root/myscriptname.sh The file is #!/bin/bash nohup mono-sgen /root/myapp.exe /path/...
5
votes
2answers
3k views

how to make alias to make grep command shorter [duplicate]

In my coding, I always do grep -rnIi "abcabc" . --color But, how to make an alias that can let me type only one word with my search string? Is that possible?
2
votes
0answers
607 views

How to find orphan directory entries in a ext4 disk

This comes from a long story of trying to recovering a TrueCrypt volume from a hardware failure (thanks, WD). I ended up with an unencrypted 3TB image that had the files that I want to recover. ...
4
votes
1answer
2k views

Converting bash script to fish

I'm trying to add the following bash scripts to fish, yet am having trouble getting the syntax in fish right. Here is the original script: export MINION_INSTALL=$HOME/minion export NOTES_HOME=$HOME/...
0
votes
1answer
62 views

Get Network activity

I have an embedded board running Linux with http, ftp and some other servers. I need a way to detect when there is no network activity both http, ftp etc. I will make a linux program, that will ...
7
votes
3answers
1k views

download only first few bytes of a source page

I am downloading the HTML source page of a website using cURL command. The problem is, I do not want most of the contents in the page. I just need the first 100 lines of the source page. Is there a ...
21
votes
2answers
37k views

wget with wildcards in http downloads

I need to download a file using wget, however I don't know exactly what the file name will be. https://foo/bar.1234.tar.gz According to the man page, wget lets you turn off and on globbing when ...
3
votes
1answer
316 views

compgen warning: -C option not working as I expected

What is the correct way to use the compgen -C option? I'm trying to learn about Bash programmable completion, and in particular the compgen builtin function. I'm experimenting with the different ...
4
votes
1answer
3k views

Does “syslogd” cause “cat /proc/kmsg” not to work properly?

I'm using cat /proc/kmsg to determine which process and file was involved in certain disc writes. I'm using the method given in this answer. But when I use cat /proc/kmsg, the output doesn't always ...
4
votes
1answer
257 views

What is the default or most commonly used multiprocessing model in Linux? Symmetric or Asymmetric?

What the multiprocessing model for Linux? Is there a default or most commonly used model? Is it similar or very different from say BSD or even the MS Windows kernel? If SMP is used normally, can ...
3
votes
1answer
272 views

program needs to be run as root by any user and can be located anywhere

I have some program called foo that needs root privileges when it executes. foo needs to be able to be run by any user and can be located at any path. The reason this program can be at any path is ...
34
votes
4answers
5k views

What are the responsibilities of each Pseudo-Terminal (PTY) component (software, master side, slave side)?

I am trying to figure out how a tty works1 (the work-flow and responsibilities of each elements). I have read several interesting articles about it, but there are still some blurry areas. This is ...
4
votes
1answer
1k views

disable mail notification on login [duplicate]

When I log in to my machine per ssh, the banner says: "no mail". Other times, it says "you have mail", even though I have no new mail. Obviously, I don't need to be informed about mail which I have ...
1
vote
1answer
165 views

Does a Virtual Machine Server Have a Web address? [closed]

Hi I'm trying to set up a server for my moodle virtual programming lab. It has something named a jail server that is used to run code remotely. I have a Ubuntu server set up with all the correct ...
2
votes
1answer
56 views

Cross executing binaries [closed]

I have a Linux machine that I own and administer (CLIENT). I have access to a UNIX server, with no administrative privileges at all (SERVER). Previously, I used to copy a lot of files from this ...
3
votes
0answers
123 views

Linux distros wont boot

I haven't been able to find an answer to this problem anywhere so im posting it here. So I'm trying to put a couple Linux distros on a laptop, using xboot and a USB drive, and when the computer booted,...
7
votes
1answer
14k views

-bash: phpize: command not found on Centos 6

When I try to run phpize I get -bash: phpize: command not found I have run yum -y install php-devel but that returns: Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * ...
1
vote
2answers
345 views

Automatically backup usb drive to computer

I am trying to create a personal sync system for my project. I don't want to use something like dropbox, bittorrent sync, owncloud etc for various reasons. At the moment, I have my computers setup ...
21
votes
3answers
3k views

mv a file to /dev/null breaks dev/null

If I do: touch file; mv file /dev/null as root, /dev/null disappears. ls -lad /dev/null results in no such file or directory. This breaks applications which depend on /dev/null like SSH and can be ...
5
votes
6answers
7k views

How to match exact string using `sed`? But not the part of it.?

I have a input file FILE1.TXT as below. 11 id1 12 13 AGE = 20 14 NAME = NAME1 15 16 id2 17 18 AGE = 30 19 NAME = NAME2 . . . 110 idXYZ 111 112 AGE = AGEXYZ 113 NAME = ...
21
votes
2answers
1k views

How do I move all files output from a command?

I have this grep command to find files without the word Attachments in them. grep -L -- Attachments * I want to move all the files that are output from that command. How do I do that in bash? Do I ...
6
votes
3answers
6k views

How do I use new fdisk table without reboot (kpartx)?

When I run fdisk and change the size of a partition, fdisk says at the end of its output: The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) I'd like to do so ...
3
votes
2answers
439 views

Using multiple layer of kernel modules for interfacing a hardware device?

I am trying to get a conceptual understanding of the purposes the kernel modules can have. The motivation for this question was a realization that interface to an actual hardware goes through multiple ...
3
votes
1answer
2k views

adduser: Specify only one name in this mode

I'm trying to add a user with this command on my debian server: #!/bin/bash APPUSER="test1" APPGROUP="test2" # User adduser -c 'uwsgi user' --group $APPGROUP --system --no-create-home --disabled-...
2
votes
0answers
7k views

Touchpad not recognized on linux (ASUS R751LB)

I have just bought a brand new laptop. Unfortunately, touchpad doesn't work on any linux distribution (tried mint Ubuntu 12.04, Ubuntu 14.04, Mint 14, Mint 16, also Mint 16 with recent 3.13.5 kernel). ...
11
votes
7answers
2k views

Options to show images when on the console

When I am on the console (the tty, the virtual terminal, which you reach with Ctrl+Alt+F1-6, not a terminal emulator), what options do I have to view images, tiff, whatever that's not text?
0
votes
0answers
393 views

Oracle Linux R6 Install Error

My Oracle Linux R6 x64 won't install. After normal install it's just blank screen. After basic video driver options install stuck on "Waiting for hardware to initialize...". Tried with different ...
2
votes
3answers
3k views

Disable login for useradd [duplicate]

I tried to disable login for a user account but got this error in debain: useradd: unrecognized option '--disabled-login' What is the equivalent of this command for useradd? Do I have to pick ...
5
votes
3answers
7k views

Try to disable console output, console=null doesn't work

as mentioned above, I want to to completely turn off the console output, but putting console= or console=null in the kernel command line doesn't change a thing. When I enque quiet to the kernel ...
1
vote
0answers
1k views

Recovering files from partitions at a corrupted SD card?

I got a problem with my SD card which had got Raspbian. Everything seemed to be ok while working with the raspberry. I inserted it to my laptop running Ubuntu 12.04.4 to fetch some files. It first ...
2
votes
2answers
352 views

Footnotes in emacs org mode: how to disable [n], but keep [fn:]?

How can I disable the [n] being linked to a footnote and highlighted? [n] can be many things, like any index of an array. So, I want my footnotes to be[fn:n]and only[fn:n]`.
1
vote
1answer
686 views

awk date identification from input file

I currently have daily files that come in via FTP with incorrect dates in the first column of the file. I have figured out how to deduct one day to derive the correct date and print this to a new file....
1
vote
3answers
198 views

Is it possible to change the default COUNT value of tail and head?

The less command accepts its defaults with an environment variable LESS, so you can export LESS='-F -g -i -M -R -S -w -X -z-4' at the beginning of your session. Is it possible to change the ...
1
vote
2answers
78 views

Attach to an existing ssh tunnel

I have an existing ssh tunnel which connects machine A to C over B. #user@A: ssh -N user@B -L 9999:C:9999 Is there any way to create a new ssh tunnel on D and attach it to the existing tunnel so ...
-1
votes
2answers
3k views

Script to change ownership of files

I am new to unix. I want to write a script to change the ownership of files from root to myuser. Script which will check the ownership and if found as root will change it to myuser. The script should ...
2
votes
0answers
3k views

NFSv4 which “domain” to put in idmapd.conf?

I'm using NFSv4 but suddenly when the NFS Server got rebooted, all the files on the Clients are having nobody ownerships after the Server is booted and started its whatever services again. Then I ...
1
vote
2answers
65 views

subsitute removing zero numbering

I would like to subsitute in a txt file the followings targets for example "code_000040" by "code_40" and "code_067340" by "code_67340" and so on.., in other words to remove the zeros in the 6 ...
3
votes
2answers
2k views

case sensitive substitution; same target ids

I am struggled myself to make a case sensitive replacement in a text file. Please find below a segment of my sed file that I am running as sed -f file.sed < input.txt > output.txt s/\<...
4
votes
1answer
122 views

How to relate a kernel config setting to the source files?

Here is an example that will explain better: I have a selected the audio driver from the picture and i would like to browse through its source. How do i get to the path of the source files from ...
0
votes
1answer
629 views

how to play video with vlc via terminal to view on webpage? [closed]

Now have VLC installed ,how to play a video with vlc via terminal running centos 6 to be viewed on website? What is the command to test it? I want to use VLC on my website which resides on my VPS set ...
0
votes
1answer
1k views

cannot send signal to VGA using VGA-to-HDMI adapter

This is the output of lspci -v: 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller]) Subsystem: ...
5
votes
2answers
10k views

How to change the user timezone?

I know that (for example in Debian) one could use dpkg-reconfigure tzdata to change the timezone of the system but I am wondering how one could change the user timezone (if Linux/Unix supports such an ...
8
votes
1answer
2k views

show colors and disable line wrap

Using the less paginator, you can use the -r option to properly display colored input and the -S option to disable line wrap. However, when using less -rS or equivalently less -r -S, colors are ...

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