The Linux Juggernaut

This a small how-to on getting block size of a file system in your Linux machine. To go in to that info we have to learn bit information about file-system.

What is a file-system?

In simple, its a way we write data on to Disks is called as file-system. There are many File-systems supported by Linux.

What is  block size in Linux?

A block is a sequence of bit or Bytes with a fixed length … Continue Reading

GREP is a command line search utility or tool  to filter the input given to it. Grep got its name from ed editor as g/re/p (global / regular expression / print).

In this post we will see how to use grep in detail and next post with the help of regular expressions.

GREP command syntax

grep options searchterm filename

or

command | grep options searchterm 

For searching a word in file

 grep 'ada' filename

For … Continue Reading

Interval Regular expressions: These are used to mention no of character/character set reputation info. Note that interval regular expression and extended reg require -E option with grep

Note:In order to use this set of regular expressions you have to us -E with grep command and -r option with sed commands

{n} --n occurrence of previous character
{1,3} - 1 to 3 times occurrence of previous character
{5, } --5 or more occurrence of previous … Continue Reading

Regular expressions (Regexp)is one of the advanced concept we require for writing efficient shell scripts. We divided regular expressions in to 3 types for better understanding.

1)Basic Regular expressions
2)Interval Regular expressions
3)Extended Regular expressions(Use option -E for grep and -r for sed)

Basic regular expressions: The set includes very basic set of regular expressions which do not require any options to execute.

Which commands support regular expressions?
tr, grep, sed, awk etc.… Continue Reading