To use this, you will need the lynx tool, so install that first.
sudo yum install lynx
Now, to get list of all the URLs in local html file or some URL, just execute this:
lynx -dump -listonly
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Generally quite a lot of us would have used the script command. This generates the logs for the session. But the problem with the logs is that it contains a lot of un-readable characters. These characters are mostly from the color codes, and as such can be removed very easily with a single command:
cat typescript | perl -pe 's/e([^[]]|[.*.*?[a-zA-Z]|].*?a)//g' | col -b > typescript-processed
This assumes the input log file is named as typescript and the output is kept as typescript-processed. You can change the names as required.
Continue readingFirefox 15 has arrived and there is lot to brag about. Since there are already many blogs on this, so just giving you a link to one of those. But what is most interesting is the integration of PDF.js. It is a new html5 + javascript based pdf viewer.
And to enable this viewer all you need to do is go to “about:config“. Search for pdfjs and set pdfjs.disabled to “FALSE” and your browser is all set to use the inline pdf viewer.
Continue readingHave you ever wanted to have a quick check on your CPU performance. I know that lot of people will say that this is not the right way to do this, but here is something that you can use to check the CPU speed.
#!/bin/bash -
#===============================================================================
#
# FILE: benchmark.sh
#
# USAGE: ./benchmark.sh
#
# DESCRIPTION: Benchmark the CPU
#
# OPTIONS: ---
# REQUIREMENTS: ---
# BUGS: ---
# NOTES: ---
# AUTHOR: Amit Agarwal (aka), amit.agarwal@roamware.com
# COMPANY: Roamware India Pvt Ltd
# CREATED: 09/21/2011 11:46:03 AM IST
# Last modified: Wed Sep 21, 2011 12:22PM
# REVISION: ---
#===============================================================================
add ()
{
COUNTER=0
exec 2>&1
time=$(exec 2>&1;(time while [[ $COUNTER -lt 100000 ]]; do ((COUNTER++)) \
; done))
echo "Time for 100000 additions is "$time
} # ---------- end of function add ----------
mul ()
{
COUNTER=0
test=2
exec 2>&1
time=$(exec 2>&1;(time while [[ $COUNTER -lt 100000 ]]; do ((COUNTER++)) \
; ((test=test*2));done))
echo "Time for 100000 mul is "$time
} # ---------- end of function add ----------
div ()
{
COUNTER=0
test=1000000000000
exec 2>&1
time=$(exec 2>&1;(time while [[ $COUNTER -lt 100000 ]]; do ((COUNTER++)) \
; (( test=test/2)); done)|tr -d '\n')
echo "Time for 100000 divisions is "${time}
} # ---------- end of function add ----------
time add
time mul
time div
And here is the output :
Continue readingSome time back there was a post on vim_use list about the “/g” flag for the search and replace functionality of the vim. And the response of “Tim Chase” on the same was very elaborate and interesting. I always knew that “/g” is only for replacing multiple occurrences on the same line, but here are few things that I did not know.
:0/this/s//that
This one will only replace the first occurrence of this in the whole file.
Continue readingI was trying to debug some bash scripts yesterday and learnt something new 😉
There are lot of things in bash that you can use to debug and to start with you can enable xtrace mode as follows:
set -x
With this set you will see that all the commands are printed along with all other information as they are executed.
This you can do for any line or for the function or for the whole script. Once you set the option you can turn it
off with
In this section we’ll develop a very basic debugger for bash.[10] Most debuggers have numerous sophisticated features that help a programmer in dissecting a program, but just about all of them include the ability to step through a running program, stop it at selected places, and examine the values of variables. These simple features are what we will concentrate on providing in our debugger. Specifically, we’ll provide the ability to:
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