Bashed Up Bits

Many people who have run Linux file servers and ftp servers have at some point wanted to free up some space. One good algorithm to do this efficiently is to remove old data starting with the largest files first. So how to generate such a list? One method is to use a " find -exec du " command: find /path/to/full/file/system -type f -mtime +10 -exec du -sk {} \; | sort -n > /var/tmp/list_of_files_older_than_10_days_sorted_by_size Once you have that list, you can selectively delete files from the bottom of it. Note that the list will likely be exponentially sorted. That is, the bottom 10% of the list will take up a huge chunk of the used storage space.

Assumptions: You have the "host" utility from BIND. You can do a zone transfer from the local DNS server Your Active Directory admins have properly configured DNS for Active Directory If you have the above, use the following command: host -t srv -l your.active.directory.dns.domain | grep _kerberos._tcp.*._sites.dc._msdcs.your.active.directory.dns.domain Replace your.active.directory.dns.domain with your actual AD DNS domain.

Non-interactive, non-login, shells inherit the PATH from the ssh process, so we must set the PATH with ssh. Some shells, like Korn Shell (ksh, rksh, pksh), only parse user environment files in login shells, so there's no way to change the inherited environment in non-interactive, non-login shells. To set the path globally, build a custom ssh with the needed default path. To set the path for a particular user, first configure ssh to use custom environments by enabling "PermitUserEnvironment" in /etc/ssh/sshd_config: PermitUserEnvironment yes Restart sshd Then set the path in that user's authorized_keys file or using ~/.ssh/environment. Note that you need to set all of the important shell variables. The existence of ~/.ssh/environment seems to preclude the setting of default environmental variable values. So, for example, given a location for binaries for rksh (restricted korn shell), /usr/restricted/bin, place the following in ~/.ssh/environment: HOME=/home/u...

"A craftswoman never blames her tools." For most, whether or not you can get your work done well on a certain platform is all that matters. To me, the three major operating platforms are tools that all have strengths and weaknesses. In the same way that I wouldn't use my nice chisels to loosen a laptop screw, I wouldn't use a MacBook for writing code for our Linux infrastructure. I am more efficient doing that work on Linux itself. At the same time, I shoot photos and video, and do some writing to take a break from IT. I've tried doing that work using the included tools on all three platforms. I find the Mac platform the most efficient and trouble-free for that work. I can do the work on Linux as well, but Linux has frustrating workflow gaps - especially regarding video. At work, even though we have a heterogenous server environment, we communicate using Microsoft Office, SharePoint, and Lync. My opinion of those tools does not matter. We chose th...

Sometimes, I want colorized syntax and nice navigation for paging. We can use vim to provide this service. This assumes your terminal client supports the terminal type "xterm-color". If you need another color terminal type, customize accordingly. Install all of the standard vim packages Add  alias cmore="TERM=xterm-color vim -R -" to your ~/.profile Add the following [1] to your ~/.vimrc syntax on hi Comment ctermfg=Blue guifg=Blue hi String ctermfg=LightRed guifg=LightRed Reload your profile: source ~/.profile Usage: cat some.script.sh | cmore    It's vim in read-only mode, so use :q to quit. [1] I found the default colors to be too dark.

Have a school or workplace in your Timeline you want to get rid of or change? Here is the method that worked for me. Log into Facebook. Click Profile. On your Timeline, click "Update Info". Under "Work and Education", click the "Edit" button in the upper right hand corner of the section. Each workplace and school will get a box. In the upper right-hand portion of each box, there is an "Edit" link and a small "x". Click the "x" and confirm your choice to delete a workplace or school. Click "Edit" to change the workplace or school.

Higher-end cameras have a number demarcated by the letter "F" that one can set to change the size of the opening (called the iris) that lets light onto the sensor. High numbers make the iris smaller. Optical physics aside, the higher the number, the more of the picture will be in focus and the more light you will need. Likewise, the higher the shutter speed, the more will be frozen in time and the more light you will need as well. So, if you want to capture something that moves fast and have it completely in focus, you need a ton of light, a high F number and a high shutter speed number. Note that a particular lens only supports a particular range of F numbers (called F-stops). You don't have a huge amount of light usually. So you have to find ways to compromise and/or cheat. One way to do this is to use a flash, but that can scare butterflies. Another way is to set the camera to do more processing. This number is demarcated by "ISO". My SLR goes from 200 ISO t...