Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs.

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/usr/local and /usr/share detailed explanation

I am afraid this is another of FHS questions but I was not able to find more detailed explanation which I feel I need. Yeah, I know about Uni FHS and etc, but what still feels like lacking ...
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154 views

Which file system best handles multiple, concurrent write sessions: GFS2, pNFS, FS-cache, XFS or OCFS2?

Which file system can handle more concurrent write sessions; let’s say 32 write sessions: GFS2 pNFS FS-cache XFS OCFS2 The file system has to handle 32 concurrent sessions with each session ...
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135 views

Where is “unix:abstract=/tmp/dbus-KtyPDgWNin” socket file saved?

I try the following: roroco@roroco ~/Dropbox/rbs/ro_cmds $ echo $DBUS_SESSION_BUS_ADDRESS unix:abstract=/tmp/dbus-KtyPDgWNin,guid=ca3ea893cf45d42ef60e74d0545d84f6 But when I want to list this ...
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25 views

Why creating a process is a two-step process (fork-exec)?

I'm studying Tanenbaum's "Modern Operating Systems" book and he's explaining that: The reason for this two-step process is to allow the child to manipulate its file descriptors after the fork but ...
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33 views

Unix cat to Windows user

I uploaded about 6GB of video in 3 separate files created using the cat command on my Mac, thinking the recipient of those files was a Mac user as well. It turns out he's using Windows 8. How can he ...
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25 views

OBDC SQL connector for Windows Auditing Server to interface with Linux syslog server

I am working on a cross platform project here is the scenario: UNIX/Linux We have a Linux syslog server currently in place collecting syslogs from all network appliances and UNIX/Linux systems. ...
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47 views

Configure directories in proftpd

I would like for one of the FTP users to leave accessible only two folders in the directory... Create file .ftpaccess with: <Directory> <Limit ALL> DenyUser vera ...
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60 views

Why doesn't ruTorrent/rTorrent respect my ratios?

I have set up my ratios such as this on ruTorrent (3.6) and rTorrent (0.9.3) : When I add torrents they stop at the 2.0 ratio as they should. If I want to seed more once it was stopped and assign ...
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12 views

Which utility or UNIX command can help to submit a bulk of event data to Google Universal Analytics?

https://developers.google.com/analytics/devguides/collection/protocol/v1/reference In the link above the Measurements Protocol is elaborated. Suppose I have a CSV file with columns like EventName, ...
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66 views

WAFL - Write Anywhere File Layout

Hi I'm looking for some information on how WAFL works , more specifically I need help in understanding the following parts. To make your task of answering simpler I've outlined a few questions. ...
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16 views

What installs fonts on a unix-based system?

I want to understand in which operating systems (unix-based), I can assume that fonts will be installed automatically? I assume they are probably installed in conjunction with a desktop GUI such as ...
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11 views

USB Target mode multiplexer for video feeds

We have proprietary (not ours) windows software that processes video from one camera connected via USB. We would like to analyze feed from many (10+) cameras by rapidly switching video source. Usage ...
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20 views

Unix: Traffic Control with pfifo queues

I'm writing my master thesis in computer science and I need to control traffic flows in my testbed. Unfortunately ethernet has got the best effort prinicple, so if there are two traffic flows on one ...
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32 views

Any file copy to /my/ftp from user(khan) should have 664 permission in solaris

I have one ftp directory /my/ftp and owner is raza. user khan is copying files to above directory. I want any file copied by user khan should have 664 permission. I tried by setting umask 002 in ...
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78 views

Very simple, single-user, hardcoded password FTP server for ubuntu

I have just mounted a Ubuntu box and would like to quickly spin a really simple FTP server that gives access to this server to upload the files. I just need a single user and I can create the password ...
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66 views

SQLServer compatibility with DoctrineDbal and Unix/Linux

I'm designing a solution for a web portal. This portal will use the micro-framework Silex which provide database access through Doctrine DBAL libraries. My target DB is a SQLServer 2008 which is ...
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63 views

Get growl notifications from within a unix screen which is not in focus from a remote SSH session

Using iTerm2 I have growl notifications working within a (unix) screen session on remote servers when that window has screen's focus: My server's ~/.bashrc has: growl() { local ...
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8 views

Unix environment variables for Unix-derived apps in Windows

My problem is that cross-platform apps initially written for Unix/GNU+Linux trash my Windows filesystem by placing files wherever they can. In most cases this can be solved by setting environment ...
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68 views

Installing APK's through mobile terminal ide?

I was wondering if you could manually install apks that are downloaded onto the SD card of my android tablet. I'm looking for something similar to the sideload command when connected to a computer. I ...
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99 views

ksh script using if break statements

I have a script file that has the server details like set -A SERVERGRPS SERVERS_CA SERVERS_NY set -A CA ca126 ca546 ca 642 set -A NY ny112 ny113 ny114 now I have to write a another script which ...
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141 views

Unix Multi-Group Permissions

I am trying to do permissions to a folder for multiple groups, each will have different permissions to the directory. Can you let me know how to do this without editing the ACL's? Group 1 RW Group 2 ...
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42 views

Message queue doesn't exists any more after reboot/shutdown of the virtual machine (Ubuntu)

I'm working on a simple multithread client/server program in C using native message queue of unix to send messages from one client to another. It works fine, but my problem is that after a reboot or ...
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21 views

UNIX command tcpdump for certain filetypes like xml

I use the unix command tcpdump with these extensions -A -s0 -ien0 port 80 I know how to add, for example a new host, that would be and \ host random.com Can i sniff for certain filetypes? I have ...
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86 views

Why isn't the loop back interface replying to injected ICMP echo request?

I want to be able to send IP packets from a userspace program and receive responses on a TUN interface. To test, I'm injecting ICMP icho requests to the loopback interface from a user space ...
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141 views

Using Tap/Tun to intercept packets at IP level

I am working on a research project involving ARP poisoning. I would like to intercept packets on the IP level. If my machine receives a packet with an IP address not destined to it's own IP ...
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83 views

0711-317 ERROR: Undefined symbol

I am installing a C package named expat-2.1.0 in AIX 6.1 machine. While performing a gmake it popping the below output. /bin/sh ./libtool --silent --mode=compile gcc -std=gnu99 -I./lib -I. -g -O2 ...
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33 views

How to get the status of VGA device

Currently I am using vga2usb device for capturing output from the virtually any VGA source such as tab or any another monitor. If I connect this vga2usb device to my Ubuntu machine then we are ...
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112 views

Can't build using MacPorts in OS X

I've submitted a ticket here, but I am pretty pessimistic it'll be addressed. As I say, there, I'm running MacPorts 2.3.1 on OS X 10.9.3. In trying to install llvm-3.2, I get the following error: ...
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997 views

FTP: Connection Refused

I am trying to transfer files between a Linux PC to a Windows PC. I can ftp the Linux PC with localhost ftp localhost prompts for the username and password and the login is successful. But when ...
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50 views

How to temporarily disable rsh between machines for user only

First, please note that I am just a regular user. I cannot do anything as a super user. Our sysadmin has enabled rsh between machines in our local network. That is, I can do this: [user@machineA] ...
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333 views

Kali Linux: Renaming files in bin

I'm just curious. I want to rename files in /bin such as - ls --> als //after I change it, the ls command no longer works and I have to use als instead - adduser --> aadduser - chmod --> achmod so I ...
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50 views

What is the meaning of double hyphen in reboot command

What is the meaning of the double hyphen in the following command: reboot -- -rx
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39 views

stop user from being runing any commands, should able to run only granted with sudo

Is there any single command or script which gives result, the list of how many commands a linux user is able to execute? And how to stop user from executing even a linux basic commands and should not ...
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310 views

how to send encrypted mail using mailx command in unix

I want to make my email encrypted as email is confidential. Can anyone please tell me how to encrypt the email using the mailx command. In my shell script I have already used mailx to send the emails, ...
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62 views

Zsh prompt produces an error

I have the default prompt for oh-my-zsh, which is great when I have a git repo, but if there is no git repo its actually failing instead of putting nothing. I trapped an ascii image to err just for ...
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261 views

How to access different tty session

I wanted to know if there is any possibility of login to other tty sessions. Someone has mistakenly changed the root su password. One of the session is already logged in as root. So any possibility ...
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32 views

What permissions should I have on a file to make it available via owncloud and readable to my local user?

Files stored in .../owncloud/data seem to be owned by www-data and in a group of the same name.
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68 views

Exposing one network interface through another on Mac OS X

I have a network interface, as specified by ifconfig inet0: flags=8842<BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1400 ether 44:44:44:44:44:44 inet 20.23.10.51 netmask ...
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157 views

Find files based on content and sender, receiver and based on date range provided

I would like to find files based on content and sender, receiver based date range provided More details below: Find files between date range (where folder names are the dates in the format yyyyMMdd) ...
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1k views

Copy files between servers using jsch

I have a java program using jsch which will connect to one unix server and display the number of files in it. Now I need to connect to another unix server and copy one file from it to first server. ...
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283 views

Failed to set permissions of path: ..\taskTracker\cyg_server to 0700

While running a job in Cygwin in Hadoop cluster, the permission failed. $ bin/hadoop jar hadoop-examples-*.jar wordcount inputwords outputwords2 Patch for HADOOP-7682: Instantiating workaround file ...
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115 views

Create FTP account under standard user

I run multiple client websites on a VPS purchased from Dreamhost. When I initially set up this VPS, I only required one user. I created a user called "thoughtspace" with the home directory at ...
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104 views

Installing php mail() function

I have recently set up a CentOS 6.4 server using the minimalistic installation. I have a working version of PHP up and running, but I want to be able to use the mail() function in PHP. What do I ...
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60 views

Can I highlight the line at which a command was issued in zshell?

I am using zsh and oh-my-zsh and would like to easily find the start of a i.e. ack or find by changing the color of the line the command started. Is it possible to change the line color as soon as the ...
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205 views

Install a VPN Server on Ubuntu or CentOS which is router compatible

I am new to this networking stuff and for the last three days I have been trying to install PPTP VPN Server on my Ubuntu. Computers running XP can connect to it without a single problem, but when I ...
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481 views

How to unwrap 80 character text

Many text filess around Internet are word split before line reaches 80th character. I understand it is desirable by those using 80 character terminals. However I like sending longer articles to my ...
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65 views

OS X — Set `Internal` flag on disk drive

I have an internal drive that OS X picks up as external? How do I tell the system that its actually internal? $diskutil info disk0 Device Identifier: disk0 Device Node: ...
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137 views

Setting mutt mimetype to handle multiple options

I've configured .mailcap for mutt to handle mimetypes of attachments individually, with different 'viewers' over the years which works well, however mailcap can handle only one application per type. ...
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90 views

How to edit a remote file with implicit su-ing to another user on remote host

I want to edit files on Unix/Linux servers from my PC (running Linux and/or Windows). However due to security, I cannot log into the remote server as the file owner, but as my named user, then sudo su ...
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58 views

Get rid of “seen” messages at GMail

The following is written by fetchmail in its log file: fetchmail: 96 messages (96 seen) for my@email at pop.gmail.com (638442 octets). From time to time this number of "seen" messages increases. It ...