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3
votes
1answer
148 views

What is a program I can use to mess up a GNU/Linux system in an automated way?

I once ran across a program that, when run on a GNU/Linux system, would automatically screw up something about the system. Maybe it would corrupt the users database. Maybe it would mess with the boot ...
1
vote
2answers
434 views

Does DM-Crypt partition look like random noise?

If I format partition with dm-crypt does its entry in partition table suggest somehow that this partition is encrypted or for someone from outside it looks like regular partition with random noise ...
5
votes
0answers
97 views

Logging violations of rules in limits.conf [duplicate]

I'm trying to log the details of the programs that where failed due to the limit cap defined in the limits.conf. My initial plan was to do it using the audit system. The idea was to track the system ...
1
vote
1answer
831 views

How to prevent users from renaming files while providing write permissions on Linux [closed]

For some special purpose, I want to prevent non-root users of the Linux Server from changing or renaming the filenames. However, they can modify and write to the contents of the file. How to do this ...
0
votes
1answer
260 views

How to auto-start my bash_profile? [duplicate]

When I open a new terminal, it doesn't execute auto-start my bash_profile. I need to do "source .bash_profile". When I use Screen, it happens again.
0
votes
2answers
452 views

Debian [ Wheezy ] : Suricata : LibHTP outdated

While looking to test suricata from the Debian Wheezy repo I ran into an issue. cat /var/log/suricata/suricata-start.log 23/9/2013 -- 19:25:03 - <Info> - This is Suricata version 1.2.1 (rev ...
0
votes
5answers
313 views

change of Unix default directory structure [closed]

Is it possible to change the default Unix/Linux directory structure? I mean by configuration and without need to change the kernel. Or if the kernel has to be edited, how hard is such task? Is the ...
7
votes
3answers
277 views

Linux/Unix variant for training system administrators

Is there a Linux/Unix based operating system used for training sysadmins? Some bugs would be deliberately included in the system and the training candidate is supposed to solve all of them. It should ...
4
votes
2answers
4k views

Vim: searching upward/downward in file from specific point/position

I want to search a word from my current cursor position in vim to upward in file. How to achieve this? Also how to do same for downward in file.
24
votes
2answers
954 views

Why did a new user inherit files from a deleted user?

So I had to do an exercise in a book as homework. First you had to create a user like: useradd -c "Steven Baxter" -s "/bin/sh" sbaxter Then you had to add some files to the /home/sbaxter directory: ...
7
votes
1answer
5k views

How to get Oracle java 7 to work with setcap cap_net_bind_service+ep

I am trying to grant the java executable the right to open ports below 1024 on Linux. Here is the setup /home/test/java contains the Oracle Server JRE 7.0.25 CentOS 6.4 Here is what getcap ...
2
votes
1answer
123 views

How to specify a daemon shutdown command with upstart?

In an upstart configuration how do I define what command should be used to shutdown a server. Lets say I have daemon that has two seperate processes. startup.sh - to start the server shutdown.sh ...
16
votes
4answers
1k views

Is it possible for a sysadmin to eavesdrop on his/her users' terminals?

When logged in to a machine, I can find out each user's pseudo-terminal device(s) from the output of w. Being a sysadmin, is it possible for me to eavesdrop on this terminal without the user being ...
0
votes
2answers
464 views

Can't Change CUPS password

I am running CrunchBang based on Debian 6. I can't do anything printer related. It is saying I am unauthenticated. I have tried: family@familydesktop:~$ sudo lppasswd -a family Enter password: Enter ...
1
vote
1answer
843 views

Which book of those two should i read to study networking for Unix/Linux administrator? [closed]

I'm quite a beginner to networking, I want to get the information that i need as a Linux/Unix admin. I have two books in hand right now: TCP/IP Illustrated, Volume 1: The Protocols UNIX and ...
2
votes
1answer
380 views

Should I use useradd or adduser?

I am trying to add a new user to the system. I am confused though which command to run: useradd or adduser?
4
votes
1answer
201 views

Distributing Updates to VirtualBox Images with (Bandwith) Efficency

I'm currently responsible for a lab of machines that all need to run the same virtual machines. I want to automate my current setup of distributing VirtualBox virtual machines via rsync (erasing any ...
0
votes
1answer
273 views

LPIC-1 for non-professional experienced user

I am interested in trying out the LPIC-1 certification however I am slightly worried that I may not have the needed professional experience to pass. I am still studying hard and running a lab with a ...
0
votes
3answers
519 views

How to limit administrative privileges to various config files?

I want one administrator to be able to edit the /etc/fstab file but one administrator to not be able to edit the fstab file. Both administrators need access to all other administrative tasks. Is ...
2
votes
3answers
391 views

How can I see which package manager is running?

I'm on Debian 6.0.5 (squeeze) and every now and then I see the following icon in the notifications area of the GNOME2 pannel: but black instead of red. It reads A package manager is working. Usually ...
3
votes
4answers
2k views

Hardware and software inventorying

Objective Collect hardware and software information from lab computers, respecting students' privacy. Type of information to collect Examples: System memory Bash verion JVM version Operating ...
4
votes
2answers
3k views

SELinux: Can I disable copying of certain files?

Please excuse me if this is too basic and you're tempted to throw an RTFM at me. I want to prevent users from copying certain files while granting them read access to the same files. I thought this ...
1
vote
1answer
1k views

Rehashing /etc/shadow. Can I force NIS users to change password?

I'm currently migrating a CentOS environment to a Debian one. The users log in over the network using NIS. I was hoping to copy /etc/shadow from my old server to my new one so that we can offer ...
0
votes
1answer
583 views

How do I safely perform the below changes to network parameters on Solaris 10?

I need to change and test some TCP/IP network parameters on a Oracle Solaris 10 as a possible workaround for a bug in 'Oracle Hyperion EPM 11.2.1.0' in the development environment. I am not a ...
2
votes
2answers
49 views

Reassign users to a single group

Right now one of our server is setup such that all users are in their own group. Is it possible to reassign them to a single group and then allow each user READ only access to other user's ...
7
votes
7answers
2k views

How to prevent a mistaken rm -rf for specific folders?

I think pretty much people here mistakenly 'rm -rf'ed the wrong directory, and hopefully it did not cause a huge damage.. Is there any way to prevent users from doing a similar unix horror story?? ...
3
votes
1answer
1k views

How can I set a directory maximum size?

Is there an easy way to cap the size of a directory? I don't think there is but just wanted to make sure. I would like to set max directory sizes for some user home dirs as well as some other dirs, ...
8
votes
4answers
10k views

How can I assign an initial/default password to a user in Linux?

I found a guide that explains how to set a user's password. I'm trying to automate it and send an e-mail to the user like: userid created with password XYZ. request to change the initial password. ...
0
votes
1answer
1k views

How do I force a user to log out? [duplicate]

Possible Duplicate: How do you kick a benign user off your system? I'm trying to remove a user account with the userdel -r command. However, it says that it is unable to remove the user ...
3
votes
2answers
1k views

How do I check active crons?

I'm trying to hunt down a cron job (or the equivalent) which I know is running, but I can't find it in the default cron files for my system (FreeBSD / Linux / BSD). How can I tell which ones are ...
4
votes
4answers
11k views

CentOS 6 - nameserver entry in resolve.conf resetting after restarting network services?

In /etc/resolv.conf, I've changed the nameserver line to a new IP address. After saving and exiting, I run service network restart. I then go open /etc/resolve.conf again and see that the IP address ...
3
votes
1answer
605 views

Package managers for local installations under home directory [duplicate]

Possible Duplicate: Non-Root Package Managers I work extensively on a remote system where I do not have admin rights. However, I am allowed to install my own binaries and programs under my ...
0
votes
3answers
150 views

How do I get a list of all enabled media in Mageia via CLI?

I have read URPMI from Mageia wiki but there seems to be no mention of how I can check the currently enabled media using urpmi command. There is urpmi.addmedia and urmpi.removemedia. So I tried doing ...
1
vote
1answer
80 views

Embedding a cmap in moinmoin

I'd like to embed a cmap in a moinmoin wiki page. I generated the cmap using dia. I then copy pasted the generated html code, modified it to point to the png image I attached to the wiki. However ...
6
votes
5answers
521 views

Which tasks to learn and which books to read to become more skilled at Unix/Linux internals? [closed]

I recently interviewed at a major company and did well on programming questions such as: "What is the time complexity of quicksort? What is the opposite in C of malloc? What is the opposite in ...
6
votes
5answers
505 views

What are the recommended ways of defending a remote *nix install from a hamfisted admin?

Once in a while (often a long while), I have a difficulty where I execute a command that completely screws up a Linux machine. Most recently, I accidentally mounted-again the root partition (thinking ...
8
votes
3answers
2k views

Linux Bulk/Remote Administration

Beside our internal IT infrastructure, we've got around 500 Linux machines hosting our services for the on-line world. They are grouped in a bunch of clusters like Database A-n, Product A-n, NFS, ...
12
votes
8answers
10k views

How to know if /dev/sdX is a connected USB or HDD?

How can I know if /dev/sdX is a local HDD or usb key ? best doing this without root privileges. OK , udevadm helped a lot: For local HDD: udevadm info --query=all --name=sdb | grep ID_BUS E: ...
3
votes
2answers
4k views

mounting to non-empty directory, then later deleting original files

I have some unused space on my disk, and decided to use a little of it to create a separate /var partition. There might be an easier way to do this, but my idea is to copy the existing /var ...
0
votes
1answer
3k views

The TIME field in ps -ef

When I do ps -ef, I see "TIME" field. What does this field mean? From what I understand, this tells the actual CPU time, that the process got (amidst all the context switching). Does the TIME field ...
6
votes
2answers
14k views

How to see complete list of processes in top

When I do 'top', I learn that there are many processes running out of which many are in sleep state. I need to see complete snapshot of all processes at that point. the 'top' is able to show listing ...
14
votes
2answers
11k views

How to know reason of a process going to sleep state and wake it up?

When I do 'top' , I see my perl script process in 'S' state. Is there a way to know, what is making this perl process go in sleep state and ways to wake it up? Any way to debug to give more insights ...
0
votes
1answer
1k views

Need help with understanding output of ps -ef on linux

When I do ps -ef on my Linux box, I get: UID PID PPID C STIME TTY TIME CMD Please help me with meaning of C,TIME. is the TIME , the actual cpu time allocated to the process?
8
votes
2answers
12k views

How to expire a password? (For inital account creation)

I've often created temporary passwords for users for my own development machine for initial id creation. For other environments, I've seen admins have the ability to have a password show as expired ...
0
votes
2answers
948 views

Automated SSH Login [duplicate]

Possible Duplicate: Shell Script for logging into a ssh server Autentification on SSH connection in OneLine How could I make a SSH Login programmatically on a unix server, I don't have ...
3
votes
1answer
1k views

How do I add a local user to a box that uses LDAP authenticaiton?

I'm working with a box that uses LDAP for user authentication. However, I need to add a local user to run some services and I don't want non-person users junking up the LDAP directory. Does anyone ...
5
votes
5answers
2k views

Why is it recommended to create a group and user for some applications?

Most of the time, when installing a program from source it is recommended to create a new user and a new group and give /usr/local/<myapp> the recently created user and group ownership. Why is ...
1
vote
2answers
301 views

Browser-based front-end to linux

I'd like to ask if anything like this exists. A browser-based tool for looking at a Linux system, managing it, and helping newbies diagnose problems. What I'm thinking of is something like this : ...
22
votes
2answers
80k views

How can I change a user's default group in Linux?

Being new to Linux administration, I'm a little confused about the following commands: useradd usermod groupadd groupmod I've just finished reading the user administration book in the Linux/Unix ...
1
vote
1answer
701 views

How can I learn some advanced logrotate techniques? [closed]

The logrotate section in the Linux administrator's handbook is very brief. The man page is ok but lacks examples. Where can I find some more comprehensive information, examples, and best-practice ...