These questions are about Linux in general -- NOT specific to a particular distribution. If the question just happens to be in a Linux environment, please specify your Linux distribution in the body of your question, but do NOT use the /linux tag.

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5
votes
1answer
15k views

What does 'wine: Bad EXE format for Z:\m\Desktop\PortForward Network Utilities.desktop' mean?

Installed wine on Debian to run a Windows exe - specifically the PortForward Network Utilities bundle: http://portforward.com/help/setup_static_ip_address.htm ). Input: wine '/m/PortForward ...
1
vote
1answer
201 views

Restricting / disabling linux disk buffering in a virtual machine

Is there an intelligent way how to restrict buffering/caching in a Linux system and to make it writing on disk more or less continuously? I am asking because I am running several Linux virtual ...
0
votes
1answer
139 views

Updating IP for port

In below unix output of "netstat -pln" netstat -pln (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) Active Internet ...
0
votes
0answers
230 views

haproxy removing mod_expires set by apache

I've haproxy server which is routing requests to different web service instance based on rules. The web service instances have apache running at port 80. Now, I'm trying to set some expiry header by ...
10
votes
3answers
7k views

Is there an alternative to CUPS?

When printing with Linux is there an alternative to using CUPS? After using it for a couple of weeks printing suddenly stopped working. The 'processing' light would come on and that would be the end. ...
1
vote
1answer
29 views

Query OS for hardware characteristics of wireless adapters

I have a raspberry pi with 2 wireless adapters connected to it - one has an antenna. http://www.modmypi.com/raspberry-pi/accessories/wifi-dongles/wifi-dongle-ultra-long-range-high-gain-w-5dbi-antenna ...
2
votes
1answer
565 views

CPU speed and cat /proc/cpuinfo

I use centos 6.4 64. I have old proc - CPU AMD Phenom II X4 810 (HDX810W) 2.6 GHz. However, when I execute the command cat /proc/cpuinfo I get the following: processor : 0 vendor_id : ...
4
votes
2answers
335 views

How and where is file system meta data cached in Linux

My earlier question apparently had a wrong premise. I thought file system meta data was cached in the inode and dentry cache, but apparently not. When I do: # time find . > /dev/null real ...
0
votes
0answers
35 views

Installed Windows 8.1 not Booting from Internal HDD

I have Windows 8.1 and Linux installed on my internal HDD. Windows is installed first, it worked fine and later I installed Linux through live USB stick. After restarting nothing happened...my ...
2
votes
0answers
980 views

How do I view multiple users groups using sssd?

SETUP OS = RHEL 6.4 Workstation System is part of an LDAP domain and was originally configured to authenticate using nscd. All recommended SSSD packages have been installed. ...
19
votes
6answers
46k views

How to output only file names (with spaces) in ls -Al?

I should echo only names of files or directories with this construction: ls -Al | while read string do ... done ls -Al output : drwxr-xr-x 12 s162103 studs 12 march 28 12:49 personal ...
2
votes
1answer
35 views

Can one physical disk provide space for several volume groups?

Can one physical disk provide space for several volume groups? Or one disk can have only one volume group in the Linux LVM? Can we use one disk in several VG's?
4
votes
2answers
5k views

Must the filesystem be unmounted while extending an LVM logical volume?

I have seen some tutorials on extending an LVM2 logical volume. None of them instruct you to unmount the filesystem. They claim that you can extend an LVM volume while it is in use. Is this right?
1
vote
0answers
145 views

Absolute path in rsync dry-run statistics

I have executed following command in order to get the list of files that would be transferred to remote server if rsync is executed: rsync -avzm --stats --safe-links --ignore-existing --dry-run ...
5
votes
2answers
11k views

Linux : See CPU usage by a process for the last second

vmstat 1 Above will print virtual memory statistics each seconds. It will also show the CPU utilization for last second. I have a web server at hand which runs httpd and MySQL. I need to find how ...
5
votes
3answers
794 views

Is there a way to really prioritize processes or make Linux respect their priorities?

I know there are process priorities like in other operating systems, going from -20 (most prio) to 19 (less prio) but Linux seems to ignore them. Right now I was building the kernel in the background ...
4
votes
3answers
5k views

Slow down just one process to regulate CPU temperature

I have a program. When it is running, the CPU temperature raise from 50 to 80 Celcius, which is my major concern. I can control the CPU frequency to slow it down, but other processes will be slowed ...
4
votes
2answers
99 views

Can I mount a case-insensitive tmpfs/ramfs?

I would like to utilize the performance of tmpfs/ramfs for some file operations, but the programs/processes that use these files assume a case-insensitive file system. I cannot find any documentation ...
1
vote
0answers
17 views

What does ipq_ctl do?

I'm in the process of writing some rust bindings to libipq, and I came across an undocumented function in libipq.h: int ipq_ctl(const struct ipq_handle *h, int request, ...);. However, this doesn't ...
3
votes
3answers
598 views

How can I convert raw printer commands back to a postscript or pdf file?

I have a string of raw printer commands that are for my postscript printer saved to a file. I believe there is a lpr option like -o raw which will read these raw command and send them to the printer. ...
0
votes
0answers
56 views

How do I configure SSHd to require 2 (or more) passwords to log in

I'm asking because I want to setup a server that cannot be administered by any single admin, not without the permission (and oversight) of one other authorized admin (there can be many). Since there ...
1
vote
1answer
126 views

linux nat different rules

eth0 (192.168.1.0/24) --> wan eth2 (192.168.10.0/24) --> lan0 I use these rules to enable NAT on my linux gateway: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE iptables -A FORWARD -i ...
1
vote
1answer
207 views

How to find bandwidth usage/bytes transmitted/received within a certain time frame

I'm looking for a way to get numbers on bandwidth usage of an eth port. But I need to filter the results to only show me numbers for the last 24 hours. Or any time period in hours or minutes. Just ...
3
votes
2answers
6k views

how to grep for specific time period in a log

We work with log files that have line entries that start with a date/time format such as this: 20150408 13:29:28 <rest of text> What would I need to do in order to grep for a date range? Say ...
1
vote
1answer
71 views

How can I set permissions on a windows share from linux client

I want to write a script to set permissions on a windows share from linux client. I know that I can use smbclient, cifs or smbfs to mount windows share from linux. But I have no idea how to set ...
0
votes
1answer
254 views

Set home directory of a user to root?

I would like to set the home directory for ftpuser to root. That's my command: # adduser ftproot -shell /bin/false -home /var/www What is the directory term for root?
1
vote
0answers
98 views

Route wireless LAN through OpenVPN

I am trying to set up my home server to act as an OpenVPN gateway so I can connect to my VPN from any device without installing special software of them. My server is running Ubuntu 14.04. The host ...
1
vote
0answers
103 views

How to route vpn traffic over hostapd-raspberry pi

I have a raspberry pi running hostapd and I am able to connect my laptop as a wifi client to the raspberry bi wifi router. The problem is with the vpn traffic, I cant connect to my office vpn with ...
1
vote
1answer
318 views

Remapping Caps Lock to Compose

Because I now and then need to use scandinavian letters despite using US Dvorak as my layout, I would like to use Caps Lock as a compose key. (I don't need Caps Lock at all, I'm not a forum troll) ...
1
vote
1answer
3k views

Fork / Cannot allocate memory

I have a 64-bit server running linux 3.x that reports "bash: fork: cannot allocate memory". This server has plenty of RAM (64G) and swap (128G) and I cannot see a particular process being the culript ...
5
votes
1answer
2k views

Remount a busy disk to read-only mode

I want to force a disk partition to read only mode and keep it read-only for more than 30 minutes. What I have tried: mount -o remount,ro (partition-identifier) (mount-point) -t (filesystem) ...
3
votes
0answers
147 views

How to generate graphs from lmbench results?

I need to use the lmbench benchmarking tool to get the system performance statistics. I am able to execute and run the results. In the results folder this is a MakeFile with this information # ...
1
vote
1answer
57 views

Saving power on a linux cluster

I would like to buy a cluster (30-60 nodes) for work and install linux on it. The cluster should have a queue system like PBS, for instance. It should also be capable of doing parallel computation. I ...
1
vote
1answer
295 views

Limit max thread use for multithreaded java app

I have downloaded a .jar file and am using java with it, and it seems multithreaded, which is great ... unless I don't want it to be multithreaded, or unless I want to use only N threads with it. Is ...
1
vote
0answers
571 views

Svn Error on import time no space left on device

When I import file in svn repository I get following error . svn: E000028: Failed writing updated file: No space left on device Following is mine diskspace and inode details # df -i ...
-1
votes
1answer
42 views

separate the system & hardware clock in linux

I want to separate the system clock from the hardware clock which I synchronize first. But now I want to change both: hardware clock with the UTC time & system with the GPS time.
0
votes
0answers
24 views

I chowned / recursively. How can I restore default permissions? [duplicate]

In a completely boneheaded moment, I ran the following command: #chown -R user:usergroup . What I failed to realize is that I was in the root directory, not in my target directory. Now the entire ...
3
votes
0answers
434 views

Unmet dependency after linux mint distribution update

I have recently updated to Linux mint rebecca. I am getting unmet dependencies for apt-get when I am trying to apt-get install a package named monodevelop-nunit monodoc-nunit-manual then this ...
0
votes
0answers
203 views

Centos 6-7 install argument for GUID Partition Table

From here http://www.tecmint.com/centos-7-installation/ item 11 NOTE:For those users, who have hard-disks more than 2TB in size, the installer automatically will convert partition table to GPT, ...
1
vote
3answers
4k views

Can anyone explain the output of mount?

I'm getting the following output when the mount command is executed. [root@]# mount /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type ...
1
vote
2answers
225 views

how can i chmod the files based on the results from find command

I have a situation where I need to find the files having World Write (WW) permission 666 and I need to re mediate such files with 664 .. for this I have used this command find /dir/stuct/path -perm ...
3
votes
0answers
237 views

Does ZFS for Linux over stress VirtualBox?

I've been using MD raid + LVM for many years, but recently decided to take a look at ZFS. In order to try it, I created a VirtualBox VM with a similar layout to my main server - 7 'SATA' drives or ...
0
votes
2answers
370 views

How to run multiple AND in grep command [duplicate]

I'm trying to run multiple AND combination in grep command, I was able to run using two patterns: grep -E 'pattern1.*pattern2' filename Is it possible to use three or four patterns using the above ...
1
vote
2answers
172 views

Linux or Unix online practice environment [closed]

I want to learn Linux or Unix, but I don't want to install on my machine. Is there any site or any other way to practice Linux online?
2
votes
2answers
135 views

What's the closest you can get to rebooting without killing all running processes?

How can I get the effect of rebooting on refreshing the system (freeing resources and reinitialising them) without killing most of the things I have running? Could I unload and reload kernel modules? ...
0
votes
2answers
210 views

Awk one-liner to print column of SQL table?

Suppose I have table like: This is first line name minimum maximum config_value ----------------------------------- ----------- ----------- ------------ some ...
0
votes
2answers
591 views

Yum Broke For some reason

i am trying to install Mysql Client i am getting this annoying message. I am still unable to find the proper answer. [root@localhost Downloads]# yum install mysql-bench There was a problem importing ...
1
vote
1answer
566 views

Kernel Panic dumps no log files

I was playing a game on Steam and all a sudden I got a kernel panic, I manually shutdown the computer and booted back into Linux Mint 17.1 (Cinnamon) 64-bit, and went to go check through my log files ...
0
votes
1answer
54 views

Create and report system acivity

I have a set-up a server running several applications. There will be multiple people using these applications in a community situation. I am looking for a way to track and report changes made to ...
3
votes
2answers
402 views

Monitoring process activities using system calls only (without utilities like `top`)

I want to obtain information about memory used by different users and different processes which users are running and statistics about those processes like memory consumption, execution speed, etc., ...