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This will calculate a running standard deviation in one pass and should never have the possibility for overflow that can happen with other implementations. I suppose there is a potential for underflow in the corner case where the deltas are small or the values themselves are small.
Download google video with wget. Or, if you wish, pass video URL to ie mplayer to view as stream.
1. VURL: replace with url. I.e. http://video.google.com/videoplay?docid=12312312312312313#
2. OUPUT_FILE : optionally change to a more suited name. This is the downloaded file. I.e. foo.flv
# Improvements greatly appreciated. (close to my first linux command after ls -A :) )
Breakedown pipe by pipe:
1. wget: html from google, pass to stdout
2. grep: get the video url until thumbnailUrl (not needed)
3. grep: Strip off everything before http://
4. sed: urldecode
5. echo: hex escapes
6. sed: stipr of tailing before thumbnailUrl
7. wget: download. Here one could use i.e. mplayer or other...
Alternatively, print all the lines that are a certain length:
$awk 'length($0)==12 {print}' your_file_name
$ vix /tmp/script.sh
Open a file directly with execution permission.
Put the function in your .bashrc
You can also put this in your vimrc:
$ command XX w | set ar | silent exe "!chmod +x %" | redraw!
and open a new file like this:
$ vi +XX /tmp/script.sh
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
Also resolves symlinks, showing the full path of the link target
Returns true if user presses the key.
Use it like
$ Confirm "Continue" && do action
It's sometimes useful to strip the embedded fonts from a pdf, for importing into something like Inkscape. Be warned, this will increase the size of a pdf substantially.
I tried this with only gs writing with -sDEVICE=pdfwrite but it doesn't seem to work, so I just pipe postscript output to ps2pdf for the same effect.
Removes all png files whose geometry is not 280x190 pixels
I was looking for the fastest way to create a bunch of ansi escapes for use in echo -e commands throughout a lot of my shell scripts. This is what I came up with, and I actually stick that loop command in a function and then just call that at the beginning of my scripts to not clutter the environment with these escape codes, which can wreck havok on my terminal when I'm dumping the environment. More of a cool way to store escape ansi codes in an array. You can echo them like:
$ echo -e "${CC[15]}This text is black on bright green background."
I usually just use with a function:
$ # setup_colors - Adds colors to array CC for global use
$ # 30 - Black, 31 - Red, 32 - Green, 33 - Yellow, 34 - Blue, 35 - Magenta, 36 - Blue/Green, 37 - White, 30/42 - Black on Green '30\;42'
$ function setup_colors(){ declare -ax CC; for i in `seq 0 7`;do ii=$(($i+7));CC[$i]="\033[1;3${i}m";CC[$ii]="\033[0;3${i}m";done;CC[15]="\033[30;42m"; export R='\033[0;00m';export X="\033[1;37m"; };
$ export -f setup_colors
CC[15] has a background of bright green which is why it is separate. R resets everything, and X is my default font of bright white.
$ CC[15]="\033[30;42m"; R=$'\033[0;00m'; X=$'\033[1;37m'
Those are just my favorite colors that I often use in my scripts. You can test which colors by running
$ for i in $(seq 0 $((${#CC[@]} - 1))); do echo -e "${CC[$i]}[$i]\n$R"; done
See: http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html for more usage.
