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Month: July 2011

How to find block size in Linux and Unix

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, it’s 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 ie 512 bytes, 4kB, 8kB, 16kB, 32kB etc. blockdev --getbsz partition Example # blockdev --getbsz /dev/sda1 4096 So the block size of this file...

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18+ grep command examples in Linux/Unix

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). Grep command can improve a command output by filtering out the required information. Grep will become a killer command when we combined it with regular expressions. In this post, we will see how to use grep command in a basic way and then move on some advanced and rarely used options. In our next couple of posts, we will see what grep can do with the help of regular...

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Regular expressions in Linux -II

Regular Expression in Linux/Unix Part 2 This is our second part on Regular Expressions in Linux. Please have a look at our first part here. 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 the previous character {n,m} – n to m times occurrence of the previous character {m, } –m or...

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My name is Surendra Kumar Anne. I hail from Vijayawada which is cultural capital of south Indian state of Andhra Pradesh. I am a Linux evangelist who believes in Hard work, A down to earth person, Likes to share knowledge with others, Loves dogs, Likes photography. At present I work at Bank of America as Sr. Analyst Systems and Administration. You can contact me at surendra (@) linuxnix dot com.