Linux Commands section is for learning the linux commands with examples.We will include basic to advance commands which is generally required for system administration task.
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…
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…
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…
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…
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 $…
With the help of cat, sed and awk command you can read or display the file contents. Learn about the method in this article.
In this tutorial we will learn, how to use awk command to print columns from file. This tip is often used by Unix/Linux System Administrator. AWK Command Awk is one of the awesome tool for processing the rows and columns.It also has feature to search keywords/strings . Awk command is widely used by Unix/Linux users…
In rare cases, you will find sometimes we need to list users above or below particular user id. Such requirement mostly come when you are playing around users related troubleshooting. For an example, we want to list the users which are above userid 500 in Linux System. The user related information like username and user…
In this tutorial we will learn, awk command to search keyword or strings in file . We will search single as well as multiple keyword with awk Command. This is a commonly used tips by most of the System Admin. Whereas the same result you can also find by using grep command. Introduction of AWK…
This post explains about grep command to find multiple strings or keyword from file. In Linux or Unix like operating system, the grep command utility is widely used. Grep is a command-line utility for searching plain-text data sets for lines matching a regular expression. Grep was originally developed for the Unix operating system, but is…
Learn how to compress and optimize JPEG JPG files. We will install JPEG compression tool in Linux operating system.
The post is about how to install libxml2 and libxslt packages on CentOS 6.5 . The method is applicable to Red Hat based distro . libxml2 is a software library for parsing XML documents. It is also the basis for the libxslt library which processes XSLT-1.0 stylesheets. (Reference : Wikipedia) libxslt is the XSLT C…
Question: How may I rsync the files to remote server which has custom ssh port number ? Answer: To rsync the files and directories with ssh to remote server we use the option -e . And to define the custom port number with ssh option within rsync command,we use the option -p. Syntax: rsync -avz…
In this tutorial, we will learn the basic use of head command in Linux / Unix system. Head command is widely used for System Administration. As the name suggest, it shows the head part means show output of the first part of files . Introduction Of Head Command Head command in Linux / Unix system,…
In this tutorial we will learn about whoami command in Linux / Unix system. We will also read about its use and advantage. Its best use is in shell like sh,ash and ksh where username is not seen in command prompt. Introduction Of whoami Command The whoami command print the user name associated with user…