Linux xdg-open — replacement for start in windows

if you want to open any document with the default document handler from the bash prompt or command prompt in linux then the simplest way to do that is use ”xdg-open”.

This can also be used in bash scripts to allow users to select which document to open without worrying about if a particular application is installed or not. Example could be where you have list of documents in the current directory (same kind or of different format.) and you want the user to select the document. In such a scenario you can take the user input for the filename and user ”xdg-open filename” to open the file irrespective of the file type or worrying about if xpdf is installed or abiword is installed or not.

Using nullglob and dotglob in bash scripts.

<a href="http://www.cyberciti.biz/faq/bash-shell-check-for-any-mp3-files-in-directory/">Use BASH nullglob To Verify *.c Files Exists or Not In a Directory has a nice explanation on nullglob and dotglob.

Photo Resizing

for i in *
do
mogrify $i -resize 640×480 i
done

Get your external IP address

$ echo -e "GET /automation/n09230945.asp HTTP/1.0rnHost: whatismyip.comrn" | nc whatismyip.com 80 | tail -n1

• <a href="http://www.commandlinefu.com/commands/view/3962/get-your-external-ip-address">View this command to comment, vote or add to favourites
• <a href="http://feeds2.feedburner.com/commands/by/Marko">View all commands by <a href="http://feeds2.feedburner.com/commands/by/Marko">Marko

<a href="http://www.commandlinefu.com"><img src="http://blog.amit-agarwal.co.in/wp-content/uploads/2010/08/header-logo.jpg" alt="" align="bottom" />

by David Winterbottom (<a href="http://codeinthehole.com">codeinthehole.com)

<a href="http://feedads.g.doubleclick.net/~a/JcVSM9r0yMSf6O0G2eSK5vyQGsU/0/da"><img src="http://blog.amit-agarwal.com/wp-content/uploads/img.zemanta.com/~a/JcVSM9r0yMSf6O0G2eSK5vyQGsU/0/di" alt="" align="bottom" />
<a href="http://feedads.g.doubleclick.net/~a/JcVSM9r0yMSf6O0G2eSK5vyQGsU/1/da"><img src="http://blog.amit-agarwal.com/wp-content/uploads/img.zemanta.com/~a/JcVSM9r0yMSf6O0G2eSK5vyQGsU/1/di" alt="" align="bottom" />

<img src="http://blog.amit-agarwal.com/wp-content/uploads/img.zemanta.com/~r/Command-line-fu/~4/7xln2n56mnk" alt="" width="1" height="1" align="bottom" />

URL: <a href="http://feedproxy.google.com/~r/Command-line-fu/~3/7xln2n56mnk/get-your-external-ip-address">http://feedproxy.google.com/~r/Command-line-fu/~3/7xln2n56mnk/get-your-external-ip-address<h6 class="zemanta-related-title" style="font-size: 1em;">Related articles by Zemanta <ul class="zemanta-article-ul"> <li class="zemanta-article-ul-li"><a href="http://www.computer-realm.net/how-find-computers-ip/">How to Find Out Your Computer&#8217;s IP (computer-realm.net) <div class="zemanta-pixie" style="margin-top: 10px; height: 15px;"><a class="zemanta-pixie-a" title="Reblog this post [with Zemanta]" href="http://reblog.zemanta.com/zemified/42c8d78f-7105-47fc-9f21-6df9065a21a3/"><img class="zemanta-pixie-img" style="border: medium none; float: right;" src="http://blog.amit-agarwal.co.in/wp-content/uploads/2010/08/reblog_e29.png" alt="Reblog this post [with Zemanta]" /><span class="zem-script more-related pretty-attribution">