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 I am sharing the tip, how to make rm -fr command to be interactive. As we know if you hit the command rm along with switch -fr ,it will remove the files and directory recursively. Sometimes because of human mistake any important file or directory can be removed. When you hit the…
In this tutorial we will learn about useful tail command with examples in Linux/Unix which will help you in linux and Unix system administration. Question: What the tail command do Answer: tail command helps to get output from last part of file. Question: When we generally use the tail command. Answer: => tail command is…
Force linux user to change password upon login In this tutorial we will learn how to force linux user to change the password upon login. There are two commands through which we can force user to change password upon first login or login.You can use any of the either command. Note: Login as root to…
In this post we will learn about how to lock and unlock user account in linux.With the help of two commands you can lock and unlock the user account in linux.We will also know, how to find the user account has lock and unlock status. To Lock the user account in Linux,use the given below…
Command to create and delete group in Red Hat and CentOS linux Question: How to create and delete the group in Linux (Red Hat or CentOS) by using command line Answer: To create and delete the group in linux,follow the given below steps. To create new group ,use given below command Syntax: groupadd groupname Example…
In this tutorial we will learn to give group ownership reference to file/dir from other file/dir in linux. Here we will take ownership and group reference from source file or directory and apply same ownership and group to target directory. Syntax: chown –reference source-file-dir target-file-dir example: chown –reference testfile sharad_testfile See the given below screenshot…
In this post we will learn to give permission reference to file/dir from other file/dir in linux. For example you have any file and directory and you want to give permission exactly same to other file and directory. Use the given below syntax: chmod –reference source-file-dir to target-file-dir eg. chmod –reference testfile sharad_testfile for more…
In this post we will learn safest method to remove softlink in linux. Softlink is also known as symbolic link which is special type of file provide the reference of file or directory with its absolute path.
To rename and move the directory and files in linux in linux we use single command called mv. The mv command is used for both purpose means renaming and moving the directory or file,it is system command which ships bydefault when you install any linux. The command is also applicable to all Unix based operating…
Learn tar command and know about its precaution Tar(Tap Archive) command is used in Unix like operating system for archiving the files. Archive is a file which has number of files and these files can be extracted to its original format with the help of extraction programmes. These archived files are called tarballs. If you…
In this post we will learn about how to set date and time as well as how to get date and time information with date command.Note: If you want to set date and time of system you must be login with superuser or root. Date command is one of the useful command in linux. At…
The tac command shows the output of cat command in reverse manner hence the name of this command is also in reverse form that is tac . As we know cat command is used to see the content of file,creating the new file and concatenating the two file also (If you do not know soon…
Long time ago one of my U.S system admin was very security conscious. He asked me to create id_rsa.pub key in server. I created the key with ssh-keygen -t rsa command. And send it him through encrypted email. Next day he wrote me ,what is the ssh key fingerprint ? First let’s have some introduction….
Today, we will walk you through how to insert and eject CD-ROM / DVD-ROM through command line in linux system. Yes! this is also true that you do not have to touch CD/DVD ROM eject switch. Basically eject command allows removable media to be ejected under software control. Here, software control is your operating system…