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sed - convert regex pattern matches to lowercase #
In this example, we'll convert text within bold tags to lowercase. Let's have a look first to make sure our search pattern returns the desired results:

$ grep '<b>.*<\/b>' foo.html
<p><a href="/">tinyapps.org</a> / <b>Graphics</b></p>
<p><b>Viewing & Editing</b></p>
<p><b>Measuring</b></p>
<p><b>Optimizing</b></p>
<p><b>Screen Capture</b></p>
<p><b>Fonts</b></p>
<p><b>Other</b></p>

Next, a test run, sending output to stdout:

$ sed 's/<b>.*</b>/\L&/g' foo.html

As expected, all characters between bold tags were converted to lowercase. (In the replacement pattern, "&" corresponds to the pattern found, and "\L" converts the text to lowercase.) Now let's use -i to write the changes in place (apparently introduced around GNU sed version 4):

$ sed -i 's/<b>.*</b>/\L&/g' foo.html

For batch processing multiple files:

$ grep '<b>.*<\/b>' *.html
...
$ for i in '*.html'; do sed -i "s/<b>.*</b>/\L&/g" $i; done

Two related tips by Karoly: 1. Use double quotes so the shell can substitute variables. 2. If your search or replace string contains special characters you need to escape them.

/nix | May 19, 2013

Tiny database #
"KISSDB is about the simplest key/value store you'll ever see, anywhere. It's written in plain vanilla C using only the standard string and FILE I/O functions, and should port to just about anything with a disk or something that acts like one." Code generously released into the public domain.

/nix | Apr 23, 2013

Newly added to Docs #
SCO OpenServer P2V; or, How to Virtualize a SCO Box. Virtualizing a physical SCO OpenServer 5 box turns out to be quite straightforward thanks to VirtualBox.

/nix | Apr 14, 2013

View ddrescue log files graphically #
ddrescueview displays ddrescue log files as a colored grid of blocks. Pascal source code available, as well as binaries from Linux and Windows. See ddrescue binary for OS X and Imaging a corrupt drive for more on ddrescue.

ddrescueview

/nix | Apr 10, 2013

Changing text mode resolution in Knoppix #
For larger console text when booting Knoppix Linux into runlevel 2 (text mode), disable graphics acceleration modules:

boot: knoppix 2 nodrm

(Thank you don999!)

/nix | Apr 02, 2013

A lightweight IMAP email client #
that resembles OS X's Mail 5.x app, Geary integrates tightly with popular webmail services and IMAP servers like Dovecot. Features include desktop notifications, fast search, offline mode, and more.

/nix | Feb 04, 2013

Backing up IMAP email accounts #
NoPriv.py backs up IMAP email accounts to browsable HTML archives. Additional features include incremental backups, Maildir creation (for easy restoring), and more.

/nix | Jan 19, 2013

Download videos from YouTube, Metacafe, Daily Motion, Vimeo, #
and many more with Movgrab. It's written in straight C with no dependencies; building is as simple as ./configure && make. Usage example:

$ movgrab -T 'http://www.youtube.com/watch?v=7XEujPG7Zjw' Formats available for this Movie:webm:640x360 (8.4M), flv-h264:640x360 (8.3M), mp4:480x360 (9.9M), flv:400x240 (8.0M), 3gp (2.1M), ... $ movgrab -f webm:640x360 'http://www.youtube.com/watch?v=7XEujPG7Zjw' ... Selected format item:webm:640x360 Progress: 3.12% 254.9k of 8.0M 41.0k/s

/nix | Oct 23, 2012

Tiny web browser #
reminiscent of the QNX Demo Disk and OffByOne: NetSurf 2.9. Key features include speed, lean system requirements, portability, and standards compliancy. In addition to C source code (which compiles nicely under Linux and other *nixes), binaries are available for AmigaOS, Atari, Haiku / BeOS, OS X, and RISC OS. (via Seth Fulton)

/nix | Jul 31, 2012

Effortlessly build a custom Linux Live CD #
and boot it instantly from a cloud-based virtual machine with SUSE Studio. Share your results with the world in one click. I put together a bare-bones 32-bit openSUSE 12.1 image for data recovery that includes:

GNOME 3 / Nautilus
Chromium
TestDisk
PhotoRec
ddrescue
hdparm
GParted
dc3dd
safecopy
kpartx (multipath-tools)
mmls (The Sleuth Kit)
make/gcc/gcc-c++
mc (Midnight Commander)
Wget
vsftpd
ftp
nc (Netcat)

Additional info:

Users: root/root, user/pass (automatic graphical login as user)
Some commands (like kpartx, iptables, and vsftpd) will return command not found unless run as root (get root prompt with su).
Firewall (rcSuSEfirewall2) is enabled by default. Modify rules with iptables.
After signing up for a free account, you can test drive the appliance online.
Found via the inaccurately-titled (but no less welcome) Use SUSE Studio to Build a Linux OS From Scratch. If you really want to build Linux from scratch, see Linux From Scratch.
See also: Data recovery tutorial

/nix | Jul 10, 2012

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