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Linux: Finding all the members of a group

Submitted by Druss on Tue, 2011-05-17 11:00

Finding all the members of a group is an occasional requirement and while there are a number of ways to do this by parsing the /etc/group and /etc/password files, Debian/Ubuntu come with a simpler solution that performs all this skulduggery for you. This is the members function that can simply be installed using sudo apt-get install members . Once this is done, members of a group named foo can be listed using:

Bind error: zone example.com/IN: NS 'ns1.example.com' has no address records (A or AAAA)

Submitted by Druss on Thu, 2011-05-12 23:44

While checking the logs of my server, I ran into the following errors:

May 11 18:00:04 named[31875]: zone example.com/IN: NS 'ns1.example.com' has no address records (A or AAAA)
May 11 18:00:04 named[31875]: zone example.com/IN: NS 'ns2.example.com' has no address records (A or AAAA)
May 11 18:00:04 named[31875]: zone example.com/IN: NS 'ns3.example.com' has no address records (A or AAAA)

I ran into the same errors when I checked the zone files themselves using:

Getting a list of all installed packages using aptitude

Submitted by Druss on Mon, 2011-05-09 22:20

Earlier today, I noticed - in htop - that a particular process, let's say 'foo-123', was running even though I had removed the package 'foo' many days earlier. I tried removing it again and found that I was right and that the package had already been removed. The package dependency list was way too long for me to go removing them one by one, or parsing them out and removing the lot.

Installing htop (on CentOS or any other distro)

Submitted by Druss on Fri, 2011-04-29 19:18

Unlike Top, its newer sibling - Htop is better in every way. It provides more detailed information, supports colours and is more configurable. Htop is available in the repositories of most distros. However, CentOS (and therefore, RHEL) is not one of them. While it it apparently available in the EPEL repositories, I could not find it for CentOS 4.9. In any event, what we have below are the (simple) steps to install it from the source packages:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Submitted by Druss on Fri, 2011-04-22 09:56

I installed MySQL on my local server today and when I went to access it via mysql_secure_installation to set my root password etc., I ran into the following curious error:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

CentOS: warning: ius-release-1.0-6.ius.el5.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 9cd4953f

Submitted by Druss on Wed, 2011-04-20 23:42

I ran into the following warning while trying to install a package from the IUS third-party repository for CentOS:
warning: ius-release-1.0-6.ius.el5.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 9cd4953f.

File renaming using sed and xargs: Prefixing all filenames with a 0 from the commandline

Submitted by Druss on Tue, 2011-01-25 00:56

Earlier today, I wanted to prefix a number of image files on a server with a 0. If this was on my desktop, I would have simply used a graphical tool such as the excellent Métamorphose. However, in this case, only a command-line was available. While Google threw up a number of bash scripts, I was curious to see if this could be done in a cleaner and more concise manner. Following the excellent reference to sed and more Google magicking, I arrived at

Configuring Samba share on Lucid

Submitted by Druss on Wed, 2010-05-05 00:00

I performed a fresh install of Kubuntu's new distro - Lucid whatever - today. As per usual, there is no front-end to configure Samba and I had to do it the old-fashioned way. The following are steps that should walk you through a basic configuration on creating a share that can be accessed from Windows:

  1. Install Samba using sudo aptitude install samba smbfs
  2. Navigate to /etc/samba/

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