UNIX : How to create many files quickly

Its easy to create many file quickly with touch command

 >touch file{1..100}.txt

The touch command is used to create file or change last access timestamp of the existing file to current time of the day.In the above example 100 files with .txt will be created in current directory with 0 bytes.You can change the value of 100 to any number you like. Another variations

 >touch {1.txt,2.txt,3.txt}

It will create 3 files as specified

 >touch {A..Z}.txt

It will create files with name as alphabets from A to Z

>touch {A..Z}_{1..10}.txt

It will create files with name as alphabets from A to Z suffix with 1 to 10

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UNIX : How to ignore lines with certain names

Sometimes we need to ignore multiple lines with certain words and get the list out of the file. usually it will be a log file to read . The below grep command can be used to ignore multiple words present in a text file. Lets say the file contain $ cat list.txt apple orange apple banana papaya Now we need to ignore line with orange , banana and papaya . So we can use the below grep command. $ cat list.txt | grep -Ev "orange|banana|papaya" apple apple It will ignore lines with the words in -v part of grep.

Scala

Scala is a object oriented functional type programing language. All variables declared in scala is considered as objects.

Python : How to create your own module in python

Python modules are easy to create and imported in to your python program. How to create a module? The python program itself can be called as a python module. All the function which you find that can be grouped together can be put into the file. Here a simple example to print the text on display is used and called as techinfotalks. #!/usr/bin/python # Python Module def func_hi(): print "Welcome to the module" #End How to use the module in program? You just import the module created by calling the import.After that directly call the function which ever you need.The module named techinfotalks is imported as named as ti. #!/usr/bin/python import techinfotalks as ti print "Calling funcion in module" ti.func_hi() #End of program

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