Linux Shell script to rename files from CAPS to small letters

This is a small script to rename multiple files from CAPITAL to small letters. Ok, why we require to do this? Recently we bought a new cam which is naming all photos in capital and it is very much difficult for me to change extension of these photos from caps to small to re-size/modify photos using mogrify Linux tool. #!/bin/bash #Author: Surendra Anne for j in * do COUNT=$(ls -1 | wc -l) if [ $j == $(basename $0) ] then echo "can not move  the script file which is running this" else org_file=$j new_file=$(echo $j | tr [A-Z]...

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Linux Shell script to close/open ports on a firewall/Iptables

This is a small script which will takecare of blocking and unblocking ports by asking user about his desire. Just copy this code to your system and change permissions and start executing it. #!/bin/bash #Author: Surendra Anne(surendra@linuxnix.com) PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin clear echo -e "############################\n\n\nPresent ports opened on this machine are $(iptables -nL INPUT | grep ACCEPT | grep dpt) \nCompleted listing...\n\n\n#########################" read -p "To open port enter open,...

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PFOTD: Python ord() function examples

Today our inbuilt function is ord() which is useful for converting a single character to its corresponding ASCII value. Need of ord() function in Python: Some times it is require to convert a string to unicode ASCII value and this inbuilt function will give python this capability. ord() function syntax: ord('char') Examples: Let us start with ord() function with some examples and see how we can use them in Python coding. Example1: Convert a char to its corresponding ascii value. >>> ord('a') Output: 97 >>> Example2:...

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PFOTD: Python chr() function example

Today our in-built function is chr() which is useful for converting an ASCII value to its corresponding character. Need of chr() function in Python: Some times it requires to convert an unicode ASCII value to its character and this in-built function will give python this capability. Python chr function Syntax: chr(number) Examples: Let us start with chr() function with some examples and see how we can use them in Python coding. Example1: Convert an ASCII value to its corresponding character. >>> chr(97) Output: 'a' >>> Example2:...

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Python inbuilt functions series at Coding Mania started

Hi all,         Today we are starting a series on Python programming called Python Function OF The Day(PFOTD) to show you all how we can use these inbuilt functions to enrich your python capabilities. The concept of this series is simple, learning a simple python inbuilt function for one day. We have around 70+ inbuilt functions which we are going to cover in this series. A brief overview of how this series go on and skeleton of each post is given as below. Built-in Python functions Built-in Functions abs()divmod()input()open()staticmethod() all()enumerate()int()ord()str() any()eval()isinstance()pow()sum() basestring()execfile()issubclass()print()super() bin()file()iter()property()tuple() bool()filter()len()range()type() bytearray()float()list()raw_input()unichr() callable()format()locals()reduce()unicode() chr()frozenset()long()reload()vars() classmethod()getattr()map()repr()xrange() cmp()globals()max()reversed()zip() compile()hasattr()memoryview()round()__import__() complex()hash()min()set()apply() delattr()help()next()setattr()buffer() dict()hex()object()slice()coerce() dir()id()oct()sorted()intern() The...

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Linux/Unix Shell scripting: Convert video file to gif image in Linux

This is a small script which will convert your video file into a gif file so that we can share it across Internet so that video player is not required to play it. The script is written in Linux Bash shell #!/bin/bash #Author: Surendra Anne(surendra@linuxnix.com) #Purpose: To convert any video file into a GIF image file. The script will take one video file from command line arguments and do the conversion using mplayer and convert. So please install these two software's before running this script. #Licence:...

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[SED]: Remove repeated/duplicate words from a file in Linux

In this post we will see how to delete repeated words. There is a human tendency to write fast and and when we try to review our writing we will find repeated words side by side. If you observe I written "and" two times. This is human mind tendency to process before we write actual word. Its hard to read entire file for duplicate words if the file is big enough to skim the text. This even cause to skip some words. A better procedure is to use some tools like SED and Perl/Python to do this with the help of Regular Expressions. I have a file...

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Vi editor: Delete matched search pattern from a file

1) How can I search for a word and delete that matched word in vi editor? This is bit tricky question. With SED its bit easy to do. In vi editor too we can search for a word and delete it with some trick. Delete matched search term from a file Step1: Go to command mode and search mode Step2: Now search for your term and replace it with nothing :%s/searchterm//g This will help you to delete all the occurrences of your search term. Let me explain above syntax :%s is for searching for entire file, if you want to search in a particular line...

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AWK Scripting: Learn AWK Built-in variables with examples

AWK inbuilt variables: FS, OFS, RS, ORS, NR, NF, FNR, FILENAME AWK is supplied with good number of built-in variables which come in handy when working with data files. We will see each AWK built-in variables with one or two examples to familiarize with them. Without these built-in variables it’s very much difficult to write simple AWK code. These variable are used to format output of an AWK command, as input field separator and even we can store current input file name in them for using them with in the script. Some of the AWK concepts...

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AWK Scripting: How to define awk variables

AWK variables: This is our ongoing tutorials on AWK scripting. As we mention earlier AWK is a full pledged language with all statements, arrays, control structures, functions etc. Today we will see how to define a variable in AWK and use it when it’s required. We already covered following AWK concepts AWK scripting: What is an AWK and how to use it? AWK scripting: 14 AWK print statment examples AWK scripting: 8 AWK printf statements examples AWK scripting: 10 BEGIN and END block examples What is a Variable? A variable is defined as storage location...

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