+Mount a cloop file:
+
+# aptitude install cloop-src
+# m-a a-i cloop-src
+
+# modprobe cloop file=/path/to/cloop/file
+# mount -r -t iso9660 /dev/cloop /mnt/test
+--
+Create a PS/PDF of a plaintext file:
+
+% a2ps --medium A4dj -E -o output.ps input_file
+% ps2pdf output.ps
+--
+Print two pages on one in a PDF file:
+
+% pdfnup --nup 2x1 input.pdf
+
+Concatenate, extract pages/parts, encrypt/decrypt,
+compress PDFs using 'pdftk'.
+--
+Read a PS/PDF file on console:
+
+% pstotext file.pdf
+
+or on plain framebuffer console in graphical mode:
+
+% pdf2ps file.pdf ; ps2png file.ps file.png ; fbi file.png
+
+or
+
+% fbgs file.pdf
+--
+Bypass the password of a PDF file:
+
+% gs -q -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=output.pdf input.pdf -c quit
+--
+Record sound:
+
+% rec test.aiff
+
+This will record a AIFF audio file.
+--
+Change passphrase / password of an existing SSH key:
+
+% ssh-keygen -p
+--
+Enable syntax highlighting in nano:
+
+Just uncomment the include directives for your respective
+language at the bottom of the file /etc/nanorc
+--
+Create netboot package for grml-terminalserver:
+
+# sh /usr/share/doc/grml-terminalserver/examples/create-netboot
+--
+Rotate pictures:
+
+Using the 'Orientation' tag of the Exif header, rotate
+the image so that it is upright:
+% jhead -autorot *.jpg
+
+Manually rotate a picture:
+% convert -rotate 270 input.jpg output.jpg
+--
+Rename files based on the information inside their exif header:
+
+% jhead -n%Y-%m-%d_%Hh%M_%f *.jpg
+
+This will rename a file named img_2071.jpg to something like:
+
+2007-08-17_10h38_img_2071.jpg
+
+if it was shot at 10:38 o'clock on 2007-08-17 (according to
+the information inside the exif header).
+--
+Calculate network / netmask:
+
+Usage examples:
+% ipcalc 10.0.0.28 255.255.255.0
+% ipcalc 10.0.0.0/24
+--
+Blacklist a kernel module:
+
+# blacklist <name_of_kernel_module>
+
+-> running 'blacklist hostap_cs' for example will generate an
+entry like this in /etc/modprobe.d/grml:
+
+blacklist hostap_cs
+alias hostap_cs off
+
+To remove the module from the blacklist again just invoke:
+
+# unblacklist <name_of_kernel_module>
+
+or manually remove the entry from /etc/modprobe.d/grml.
+--
+Create a Debian package of a perl module:
+
+% dh-make-perl --cpan Acme::Smirch --build
+--