basename and dirname

basename

basename is a command used to get the filename or the leaf directory name from a path given. basically it will select the last string which is prefixed by /.

For example:

>basename /x/y/z/abc.txt
abc.txt

The above command will bring output as abc.txt

>basename /x/y/z/
z

It will bring z as output

Please note , inside a script if we use basename $0 , it will bring the name of the script. It has many uses.

dirname

dirname will bring the path of the directory. ie the prefix for / for a leave directory name or file.

For example:

>dirname /x/y/z/abc.txt
/x/y/z

The above command will bring output as /x/y/z

>dirname /x/y/z/
/x/y

It will bring /x/y as output

Comments

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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