Linux is the family of Unix-like operating systems that use the Linux kernel.
6
votes
9answers
446 views
What is/are the standard CLI program(s) to manage users and groups?
As the title says, I'm basically asking about user management from the command line (e.g. on a system where there are no graphical tools available). In the past I've used several different programs to ...
5
votes
1answer
180 views
Detection of USB Modem is unstable - how can I correct this?
I am using Huawei 3G USB Modem in Ubuntu 12.04 LTS on DELL Inspiron NS5520. I tried every possible solution but had no luck. Whenever my USB Modem disconnects, I can not re-connect it and then I have ...
1
vote
2answers
198 views
Discrepancy between reported used memory and sum of application memory usage
I'm running a desktop system that quite regularly suffers from lack of memory, this prompted me to investigate what causes the issue in the first place.
Problem is, there's no single process that ...
0
votes
1answer
20 views
nohup and screen not working when running program in background?
I don't why but my screen command running on server is stopping on its own. Therefore I tried to use nohup. e.g:
nohup bzcat a.bz
But when running nohup it is giving me
nohup: ignoring input and ...
4
votes
4answers
2k views
Downsides of umask 077?
What are the cons, for having a restrictive umask of 077? A lot of distros (I believe all, except Red Hat? ) have a default umask of 022, configured in /etc/profile. This seems way too insecure for a ...
1
vote
2answers
51 views
Unable to chown recursively
I'm using this command:
chown root:www-data /var/www/example.com -R
but I get an error message that the directory is not listed.
What is wrong?
25
votes
9answers
4k views
Easy incremental backups to an external hard drive
For a while I used Dirvish to do incremental backups of my machines, but it is slightly cumbersome to configure, and if you do not carry a copy of your configuration it can be hard to reproduce ...
5
votes
2answers
72 views
Rearrange partitions to install a second Linux distribution
I am new to Linux and just got some foggy idea of partition tables. To be precise here it is:
Model: ATA ST3500418AS (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition ...
2
votes
1answer
214 views
How to mount a virtual disk in Linux (on VMWare)
I am running Ubuntu 10.04.4 thru VMWare Workstation. I added a second virtual hard disk drive, which is found under /dev/sdb , as shown below
How do you mount this to anywhere? (e.g. /mnt/sdb).
...
0
votes
1answer
31 views
VSFTPD Virtual User Group
Currently I have a Running vsftpd server in a Cent OS Machine with virtual users.
Users are authenticated using MySQL.
The users has all the permissions in their home directory and they are jailed ...
19
votes
2answers
531 views
How frequently is the proc file system updated on Linux?
How frequently is the proc file system updated on Linux? Is it 20 milliseconds (time quantum)?
1
vote
0answers
12 views
davfs2 keep files cached longer
I'm using davfs2 to sync with my box.com account and I'm trying to play with the cache settings to get more Dropbox-like functionality.
I've noticed that after I don't open a file for a little while ...
0
votes
1answer
55 views
Install x11 on my own linux system
I have developed my own tiny linux file system using buildroot and busybox. I used linux-2.6.38.8 kernel configured and cross-compiled for target system(X86) according to needs.Now the filesystem is ...
4
votes
2answers
4k views
How get the best quality when converting from mp4 to avi with ffmpeg?
When I use this, the quality doesn't look bad.
ffmpeg -same_quant -i video.mp4 video.avi
In the ffmpeg documentation is written: "Note that this is NOT SAME QUALITY. Do not use this option unless ...
3
votes
0answers
260 views
Why is systemd-coredump storing the dump in memory itself?
I just noticed that most of my memory was hogged by coredump of a few processes that I had killed recently. I had a systemd-coredump process running for each crashed process (usually the processes ...
3
votes
2answers
168 views
Can AIDE scan a directory inside a directory the user doesn't have read permissions for?
I would like to use AIDE to help me verify the integrity of my home directory on a shared Linux system. I am not an administrator of this system. I have built and installed AIDE in my home directory ...
2
votes
6answers
325 views
Recommend a reading for learning Linux firewalls configuration for beginner?
I am using Linux at home and want to be able to configure firewall. I would like to understand what I am doing not just copy paste some rules from internet :).
9
votes
5answers
526 views
What should I expect if I switch from Ubuntu to openSuse
As probably most of you I have been long using Ubuntu. I'm not an expert, but I have been using different distros until I settled with Ubuntu.
I started using SuSE 5.x, Conectiva (that later became ...
33
votes
11answers
3k views
Is it good to make a separate partition for /boot?
I've seen some people make a separate partition for /boot. What is the benefit of doing this? What problems might I encounter in the future by doing this?
Also, except for /home and /boot, which ...
13
votes
3answers
1k views
How can I set the processor affinity of a process on Linux?
The question is all in the title: How can I set the processor affinity of a process on Linux?
0
votes
1answer
28 views
What are the other congestion control algorithms specially designed for lossy Wireless Networks like LTE and WiMax?
I am trying different congestion control algorithms for getting maximum throughput and minimum delay across my setup for TCP flow.Please suggest other available algorithms apart from
Veno, ...
2
votes
1answer
37 views
cleaning /dev/md0 filesystem ( raid)
I have a CentOS server using raid.
The /proc/partitions contains:
major minor #blocks name
8 0 976762584 sda
8 1 104391 sda1
8 2 921600855 sda2
8 3 55054755 ...
24
votes
13answers
8k views
Determine the size of a block device
How can I find out the size of a block device, such as /dev/sda? Running ls -l gives no useful information.
2
votes
2answers
1k views
Remove GPT - Default back to MBR
I keep receiving this error:
Warning!! Unsupported GPT (GUID Partition Table) detected. Use GNU Parted
I want to go back to the normal MBR. I found some advice here and did:
parted /dev/sda
...
1
vote
2answers
63 views
What Linux Distro contains support for Killer E2200 Ethernet chip?
I've been very interested in switching over to a Linux based system lately. I've decided I'm going to dual boot, but my primary machine will be the Linux system. I found that Ubuntu 12.04 didn't have ...
5
votes
4answers
115 views
Can I share /usr/local between multiple Linux distributions?
I tried Ubuntu 12.04 and based on my understanding I made the following partitions:
2GB Swap (I have 2GB of RAM)
1GB /boot, since I'll be installing different kernel versions (I'm starting kernel ...
0
votes
1answer
435 views
VirtualBox Hangs when installing freebsd 9.0
When installing Freebsd 9.0 as virtualbox guest, it hangs. Freezes the guest OS, other VirtualBox windows works fine.
Logs attached, hardware is pentium D, 4 GB ram, Asus p5ld2 deluxe mainboard, OS - ...
20
votes
4answers
9k views
Moving linux install to a new computer
I know that it can, in some circumstances, be difficult to move a Windows installation from one computer to another (physically move the hard drive), but how does that work on linux? Aren't most of ...
1
vote
2answers
44 views
Transfer a Fedora system to another computer
I'd like to transfer my Fedora to a remote machine. Fedora is under Grub 2.0 and on the remote machine there is a Centos system and Grub 0.97. In fact, I have two questions.
First is how to properly ...
0
votes
1answer
27 views
What does the package UPower output if on a desktop
On Ubuntu 12.04, if I use the command:
upower -i /org/freedesktop/UPower/devices/battery_BAT0
It will output all of the statistics for the battery. However, what does it output if I am using a ...
3
votes
3answers
268 views
Is Linus Torvalds a hacker? [closed]
Maybe wrong place for the question, but I couldn't find the answer.
The wiki says he's software engineer and hacker. (http://en.wikipedia.org/wiki/Linus_Torvalds)
Is it true?
I must tell I haven't ...
3
votes
2answers
59 views
Setuid bit seems to have no effect on bash
I was experimenting with the security of my system and noticed something strange: setting the setuid bit on a copy of bash located at /usr/bin/bash-test seemed to have no effect. When I ran an ...
3
votes
2answers
534 views
nVidia proprietary driver
I successfully installed NVIDIA-Linux-x86_64-290.10.run on my Debian Squeeze desktop but I do not see /var/log/nvidia-installer.log clearly stating which file(s) have been added/replaced. Does anybody ...
1
vote
2answers
115 views
Installing Simon Listens on Linux Mint
Recently I've heard about the Simon Listens package which enables you to create a speech recognition engine on Linux as well as windows. I have Linux Mind 14 - cinnamon installed on my laptop.
I ...
3
votes
1answer
49 views
Does the vmlinux header contain the length of the kernel image?
I am trying to disassemble a compound file that consists of several parts, one of which is an uncompressed kernel sandwiched between several other files. I am trying to find the exact length of the ...
0
votes
1answer
29 views
Can't delete system email
While running Postfix on an Ubuntu, I have acquired a number of test email in an account usr1, and now I want to delete them before starting other testing. However, every time I try to delete using ...
0
votes
2answers
52 views
Grep to search directories for patterns inside a text file
I have a file where it contains a list of search patterns (searchPattern.txt). Its contents is similar to the contents below where there are 3000+ of them.
123456
234567
345678
.
.
.
What I wanted ...
1
vote
1answer
52 views
curses-based program for selection item from the list
Is there in the linux any program which can represent (via pipe or something like that) results of such commands as, for example, ls, cat, grep, ps etc, by means of curses (for example as listbox)? So ...
2
votes
2answers
561 views
Set default sound card in Pulse Audio
I have two soundcards on my systems and pulseaudio always picks the wrong one. How do I set up the default soundcard in the pulse audio preferences?
10
votes
3answers
291 views
After researching, still confused about monitoring RAM usage
I went through this article, which explains various methods for checking your RAM usage. However, I can't reconcile the different methods and don't know which one is correct.
When I first login, I'm ...
4
votes
2answers
267 views
What is “kernel dynamic memory” as reported by smem?
While diagnosing low memory problems in my desktop machine (details at U&L) I've noticed that my noncache "kernel dynamic memory" is big:
# smem -twk
Area Used ...
1
vote
1answer
32 views
How to add RAID5 to existing crypto-LVM?
I recently installed Debian Wheezy and let the installer guide partition the disk using a whole partition with encryption (LVM). Later on I've added four disks and setup RAID5 on them (using mdadm).
...
0
votes
2answers
301 views
Why are my application.desktop files not showing up in Linux application menu?
I've written quite a few open source programs over the years, but not very recently, and I've never had this problem before. The menu items for my new project simply refuse to show up in menus on ...
0
votes
1answer
22 views
Upgrading dpkg on 64-bit debian
Recently I tried to install Steam on my debian, but I ran into a problem. It requires dpkg version 1.16.2 (for multiarch) but the one installed on the system is 1.15.8.13
The problem is that running ...
1
vote
2answers
34 views
Assigning IP to a bridged interfaces
Is there a way to assign an IP to bridged interfaces? For example, under normal circumstances:
ifconfig eth0 0.0.0.0
ifconfig eth1 0.0.0.0
brctl addbr mybridge
brctl addif mybridge eth0
brctl addif ...
0
votes
2answers
42 views
How to install multiple glibc on fedora
I have a fedora 4 installed on my computer and it has glibc version 2.5.3, but I want to install a software that needs a glibc 2.7+ . On the other hand, I have some programs that need this 2.5.3 ...
0
votes
1answer
94 views
Socket buffer and purpose of SO_RCVBUF [closed]
I'm trying to figure out what the SO_RCVBUF actually does.
Referring to the Linux kernel, it seems that the value specified with this option is just assigned to a variable (sk_buff.rcvbuf), which ...
3
votes
2answers
69 views
How to find out UUID of a non-block USB device?
In a nutshell, the device I have is not a block device so blkid command doesn't suit me. But at least I can get some info about my device via lsusb -v command although it doesn't contain its UUID.
...
2
votes
7answers
177 views
Determining Linux architecture from files
I have a system with an unrecoverable /usr partition. Terrified the drives are going bad, I've got it booted into a LiveCD environment, and I can't remember what the install architecture was, the ...
4
votes
3answers
137 views
Can someone execute a malware by just inserting a flash disk?
I know that Linux is virus proof, but just to be sure...Suppose someone writes a script, trojan, etc... and put it on a flash disk or CD. then I insert that flash in my system without clicking on any ...
