Empty a file

2010-12-26 1 min read Learning Linux

This one is for those who know the “touch” command. Hope all of us do not follow a command just because it is on one of the popular site without trying to understand the command and the output.

Bash Script Beautifier

2010-12-23 1 min read Bash Learning Linux

Today I was working on a bash script written by someone else. And the script was maintained since long and had actually become quite big and there was no indentation followed. So, you can understand how difficult it was to understand the script. So, I set my foot forth to first find a beautifier for the bash script before I fixed it and my search ended here.

Take a screenshot of the window the user clicks on and name the file the same as the window title

2010-12-19 2 min read Bash Learning Photo

Take a screenshot of the window the user clicks on and name the file the same as the window title

  <td>
    <div class="text codecolorer">
      &nbsp;sleep 4; xwd >foo.xwd; mv foo.xwd "$(dd skip=100 if=foo.xwd bs=1 count=256 2>/dev/null | egrep -ao '^[[:print:]]+' | tr / :).xwd"
    </div>
  </td>
</tr>

In general, this is actually not better than the “scrot -d4” command I’m listing it as an alternative to, so please don’t vote it down for that. I’m adding this command because xwd (X window dumper) comes with X11, so it is already installed on your machine, whereas scrot probably is not. I’ve found xwd handy on boxen that I don’t want to (or am not allowed to) install packages on.

List all installed rpm packages and it’s size

2010-12-09 1 min read Fedora Linux

If you are looking for a command to see the disk usage by each of the rpm‘s then you can use this command:

  <td>
    <div class="text codecolorer">
      &nbsp;rpm -q --queryformat "%10{SIZE}\t%{NAME}\n"
    </div>
  </td>
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And if you use this command very regularly then you can create an alias like

  <td>
    <div class="text codecolorer">
      &nbsp;alias rpm_size='rpm -q --queryformat "%10{SIZE}\t%{NAME}\n" '
    </div>
  </td>
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and use it like

Introduction to the Command Line (Second Edition) — Free Ebook Download

2010-10-06 1 min read Learning Linux

Pretty good book for beginners on command line whether you work on Ubuntu, Fedora, BSD or any other version.

http://www.lulu.com/product/ebook/introduction-to-the-command-line-%28second-edition%29/12665426

Install LibreOffice on Fedora and Ubuntu (ghacks.net)
Learn To Use The Ubuntu Command Line With CLIcompanion (makeuseof.com)
How To Install GIMP in Ubuntu (crenk.com)

F-Spot photo viewer – another tool with option to view the exif data.

2010-09-22 1 min read Photo

Here is another tool worth looking at for <a class="zem_slink" title="Image viewer" rel="wikipedia" href="http://en.wikipedia.org/wiki/Image_viewer">Image Viewer. Its called F-spot and the description for the same is as below :

F-Spot is an application designed to provide personal photo management to the GNOME desktop. Features include import, export, printing and advanced sorting and tagging of digital images.
Continue reading

Handy one-liners for SED

2010-09-14 0 min read Bash Linux

$\"A$: Image via Wikipedia

Here are some links to sed one liners, pretty useful if you want to use the power of sed.

<a href="http://www.freearchive.org/o/dd1ebea77f64bdef5982d50e868990202b0bf6f21b42e26ebb0ab1011d6ce546">http://www.freearchive.org/o/dd1ebea77f64bdef5982d50e868990202b0bf6f21b42e26ebb0ab1011d6ce546

<a href="http://www.unixguide.net/unix/sedoneliner.shtml">http://www.unixguide.net/unix/sedoneliner.shtml
<a href="http://sed.sourceforge.net/sed1line.txt">http://sed.sourceforge.net/sed1line.txt <a href="http://www.thegeekstuff.com/2010/06/bash-array-tutorial/">

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