sed is stream line editor utility in unix operating systems.sed is a line-oriented text processing utility: it reads text, line by line, from an input stream or file, into an internal buffer called the pattern space. Each line read starts a cycle. To the pattern space, sed applies one or more operations which have been … Read more
In this post I am sharing the trick to edit file without opening it. To achieve this task we will use vi editor. vi is very well known,popular,ultimate and awesome editor and by default available in all Unix/Linux operating system. Syntax: vi -c ‘COMMAND|wq’ /path/of/file Example: We will replace a keyword with new keyword in … Read more
SSH, the abbreviation is Secure Shell. It is a software program use the secure shell protocol to accept connection from remote computers.SSH is TCP based protocol. By default the ssh protocol listen at port no. 22 . You can also customize the port number but always remember while changing the ssh port no. it should … Read more
FAQ : How to set root password on Ubuntu / Debian / Linux Mint Operating system ? How may I also check , the root password is working ? Answer: Ubuntu is Debian based operating system. Whereas Linux Mint is based on Ubuntu and Debian both. Set / reset root password on Ubuntu / Debian … Read more
In this post we will learn how to use grep command to remove commented lines. We can also use egrep command which is extended form of grep command. As a Linux System Engineer, I mostly use some of the command. Most of the time when I am busy in playing on system, I generally meet … Read more
FAQ : How to use grep command to remove blank lines from file Answer: To remove the blank lines from file, use the given below syntax grep -v ‘^$’ /path/of/file-name In above command, -v = Invert the sense of matching, to select non-matching lines ^$ = It is regex. ^ means start with and $ … Read more