bash one liner to change/remove test pattern from config file or text file.

Problem:

I had a directory with a lot of config files in the ini file format, i.e. name and value separated by equals. Some/all of these contained some directory names and other values which had to be replaced. But there were other place where I should not not replace them, if there was no exact match. I also needed to have a backup copy of the file that I was modifying. Since the number of files that I needed to change was multiple so was quite difficult to do it without using some script.

Visualizing system performance data

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<font SIZE="6"><a HREF="http://feedproxy.google.com/~r/Command-line-fu/~3/jjk4Htw9rvo/visualizing-system-performance-data">Visualizing system performance data

$ vmstat 2 10 | awk 'NR > 2 {print NR, $13}' | gnuplot -e “set terminal png;set output 'v.png';plot '-' u 1:2 t 'cpu' w linespoints;" draw `vmstat ` data using gnuplot

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

Using PHP to search a MySQL database and return paged results

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Link above to the article. I am using this as base to do some programming of my own for my website. When I am done I can post few more details, till then…………

Quick one liner bash function to navigate parent directories quickly

up () { for i in $(seq 1 $1) ; do cd  ..; pushd +1 ; done; }
— if you like the popd and pushd way ..

up () { for i in $(seq 1 $1) ; do cd  ..; done; }
— otherwise .. <div class="zemanta-pixie"><img class="zemanta-pixie-img" src="http://blog.amit-agarwal.co.in/wp-content/uploads/2010/08/pixy4.gif" />