UNIX : unpack and pack using tar

Tarball or tar is a utility in linux to unpack or pack the files.

Lets say we have a file name hello.tar.gz which is packed and compressed.

To unpack the file use the below command

> tar xvzf hello.tar.gz

This is unpack the compressed tarball file to the directory hello in current location.

To pack a list of files to a compressed tarball file , we can follow the below steps.

Let say we have the following list of files in Hello directory.

> cd Hello

> ls
helloworld.py
README.txt

Move back to parent directory and give the below command.

> cd ..

> tar zcvf hello.tar.gz Hello

This will create the compressed tar file in the current location

Comments

UNIX : How to get record count from zipped file

Sometimes we may need to get records count from file . For that we can use wc -l , command with file name. In some situation the file will be in compressed format . wc -l will not directly work with zipped files . In this case we can do zcat the file and pipe the word count command with it. Example : Let say we have a file cricketData.dat.gz To get word count from the file use : zcat cricketData.dat.gz | wc -l This will give the record count.

Excel : How to pad zeros

Today I got a requirement to format the number in excel cell - to left pad number with zeros.i find the following function very useful to do it. In case one to make the number left padded with "0" s give the formula =TEXT(A1,"0000") In case two even more enhanced form to make it left padded with "0" and add two decimal places give the formula as =TEXT(A2,"0000.00")

Scala

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

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