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.
In this post, you will learn about how to search keyword or string in Man Page like we do in vi/vim file editor. It basically searching keyword within same man page of the command. Question: How may I search a keyword in man page like we search in vi /vim editor ? Answer: To search…
In this tutorial we will learn, simple method to find the keyword in all available man pages in Linux / Unix system. First we have to be confirm that man command is installed. man page Abbreviation of man page is manual page. It is a software documentation in Unix like operating system. Generally in many…
When we work in terminal or command line, sometime we want to know in which current directory we are working. And sometimes we also want to know in which previous directory I worked.These requirement are simple but are very important for system administration. Information of working directory is also required in scripting. When system administrator…
In Linux and Unix Systems, cd command is one the basic,essential and frequently use command.Abbreviation of cd is “Change Directory” . For Linux/Unix System Administrator, it is important to know by how many ways cd command can be used. In this post, I have listed 6 examples which will help you in your daily system…
Learn how to configure or set motd on Linux Operating Systems. The motd abbreviation is “Message Of The Day”. The motd is widely used in Linux servers.
In this post we are explaining about type command with examples. In Linux system, type command is used for displaying information about command types. It displays if command is an alias,shell function, shell builtin, disk file, or shell reserved word. You can use type command with other command names also. With the help of type…
When we execute any command or script,it returns an exit status. The exit status is also called as return code or exit code. It is important to know the exit status of command which we execute. The method which we are going to describe become more helpful with script also. Exit status must be an…
Learn more about which command with examples to find the path of Linux command and executable files in Linux and Unix operating system.
In this tutorial we will learn about, how to use df command to check the mounted filesystem on linux. As a Linux System administrator, this command is basic and very important.The df command shows the usage of mounted filesystem.It is notable that the filesystems which are not mounted on system,we can not get its information…
The post is about to show account aging information.To get details of user account password expiration ,we use the command chage. With chage command use the option -l or –list. The chage program requires a shadow password file to be available.The absolute path of shadow file is /etc/shadow.It is notable that /etc/shadow file has password…
Today,in this post we will learn, How to show line numbers with less command in Linux.In our previous post we have described about how to show line number with cat command. Less command is similar to more command but it has more features.As the name suggest, it read less output rather than reading the entire…
In this tutorial we will know, how to test rpm package before installation .You may have seen while installing the rpm package file by using rpm -i command, some problem may occur. It can be issue with dependency,GPG signature or corrupt rpm package etc. As a Linux System Engineer,this command is very useful and should…
In this post,we will know the linux command to find installation date and time of rpm package. As a Linux System Administrator,we take part in IT auditing activity. Sometimes for cross check we require the exact date and time of rpm file installed in Red Hat based Operating System (RHEL/CentOS/Scientific Linux). Hence,for auditing purpose,it is…
In this tutorial we will learn,how to allow only members of Wheel group to use su command.Means only members of wheel group can switch to another user by using su command.As we know that in Red Hat based operating system, wheel group is a special administrative group. To allow only Wheel group’s member to use…
In this post we will know,how to create a system account below uid 500 on Red Hat based operating system.In Red Hat based operating system,the system account are below UID 500. The UID below 500 are reserved for system use ,it should not be assigned to other users. We can easily check the system user…