Check These Out
This is an example of the usage of pdfnup (you can find it in the 'pdfjam' package). With this command you can save ink/toner and paper (and thus trees!) when you print a pdf.
This tools are very configurable, and you can make also 2x2, 3x2, 2x3 layouts, and more (the limit is your fantasy and the resolution of the printer :-)
You must have installed pdfjam, pdflatex, and the LaTeX pdfpages package in your box.
It willl popup a message for each new entry in /var/log/messages
found on the notify-send howto page on ubuntuforums.org.
Posted here only because it is one of the favourites of mine.
Curious about differences between /bin, /usr/bin, and /usr/local/bin? What should be in the /sbin dir? Try this command to find out.
Tested against Red Hat & OS X
Define a function
$ vert () { echo $1 | grep -o '.'; }
Use it to print some column headers
$ paste
Next time you are leaching off of someone else's wifi use this command before you start your bittorrent ...for legitimate files only of course.
It creates a hexidecimal string using md5sum from the first few lines of /dev/urandom and splices it into the proper MAC address format. Then it changes your MAC and resets your wireless (wlan0:0).
Converts any number of seconds into days, hours, minutes and seconds.
sec2dhms() {
declare -i SS="$1"
D=$(( SS / 86400 ))
H=$(( SS % 86400 / 3600 ))
M=$(( SS % 3600 / 60 ))
S=$(( SS % 60 ))
[ "$D" -gt 0 ] && echo -n "${D}:"
[ "$H" -gt 0 ] && printf "%02g:" "$H"
printf "%02g:%02g\n" "$M" "$S"
}
Shows all block devices in a tree with descruptions of what they are.
search ubuntu's remote package source repositories for a specific program to see which package contains it
Change the -p argument for the port number. See "man nmap" for different ways to specify address ranges.
Write each FILE to standard output, with line numbers added. With no FILE, or when FILE is -, read standard input.