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Aleksey Tsalolikhin's blogHow to read tapes in TAR per frame formatSubmitted by Aleksey Tsalolikhin on Fri, 2008-05-23 11:21.
TAR per frame means each TIFF file is written as a separate TAR file onto tape. This is a practice in the entertainment industry. Now, the default tape device (/dev/st0 on Linux) rewinds after each command. Trying to read consecutive files, and rewinding between each read, adds a lot of time. It's possible to specify a no-rewind tape device which doesn't rewind after each command. The device name is different on every Unix but on Linux it's /dev/nst0. (the "n" stands for no-rewind. The "st" stands for SCSI tape.) Here is a loop to read a file and then advance to the next This command will extract the entirety of the TAR per frame tape. add new comment | 3615 reads
Allow me to encourage you to join the very cool USENIX AssociationSubmitted by Aleksey Tsalolikhin on Wed, 2008-03-12 23:52.
This just in: USENIX is pleased to announce open public access to all its conference This significant decision will allow universal access to some of the USENIX could not achieve such goals without the support and dedication add new comment | 661 reads
backing up crontabs over ssh (many-to-one disk-to-disk backup)Submitted by Aleksey Tsalolikhin on Wed, 2008-03-05 22:02.
Here is a pair of ssh "for" loops to backup all the crontabs on my Linux and HP-UX systems to my admin host: for f in `cat ~/linux_hostnames.txt ` for f in `cat ~/hpux_hostnames.txt ` Let me know if this is useful to you. Best, add new comment | 743 reads
How to use zip to compress filesSubmitted by Aleksey Tsalolikhin on Sat, 2008-02-16 20:22.
The syntax is: zip output_archive_name input_file_name Examples: zip new_archive_name existing_file_name will compress existing_file_aname into new_archive_name.zip zip new_archive_name directory_name will create new_archive_name.zip add new comment | 13874 reads
useful little perl script to insert timestamps into your data stream / pipelineSubmitted by Aleksey Tsalolikhin on Thu, 2008-02-14 19:21.
I wrote this script to insert a timestamp into the pipeline. I call it "teetime" after /usr/bin/tee. It can make vmstat more informative, for example: vmstat 1 | teetime
add new comment | 17389 reads
Endorsements of Aleksey Tsalolikhin from his colleaguesSubmitted by Aleksey Tsalolikhin on Tue, 2008-02-12 13:06.
To start the day off on a positive note, I decided to post my LinkedIn endorsements on my web site. Here are a few: "It was always a pleasure working with Aleksey at Earthlink. His dedication to projects, technical knowledge, and interpersonal skills are only a few of his many attributes." (December 25, 2005) "Aleksey has a natural ability to care and help his peers with seemingly complex problems. His can-do attitude is extremely refreshing in high stress situations." (August 4, 2005) add new comment | 399 reads
How to remove IPv6 on Red Hat nodesSubmitted by Aleksey Tsalolikhin on Sun, 2008-02-03 14:52.Linux
Picked up this tid-bit on how to disable IPv6 (which aligns with the general sys admin philosophy of "if we are not using it, remove it or turn it off to simplify the system and increase security": (1) Edit /etc/sysconfig/network and set NETWORKING_IPV6=no. (2) Issue the following command as root: 'chkconfig ip6tables off'. (3) Reboot the host machine. 2 comments | 11765 reads
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