Here in this post,we will learn very useful alias command with examples.In linux and Unix like operating system,mainly we use the alias command to shorten the long command.It is something like instead of writing long command in terminal,you type a few letters on terminal and your desired command get run. To understand the meaning of…
In this tutorial we will learn,how to install libjpegtran by using yum command in CentOS 6.x. The libjpegtran is mainly used for optimizing the jpeg and jpg format files.This utility compress an image without losing the quality of file. If you are running a website which has lots of jpeg/jpg file, which may take time…
Manual pages are software documentation found in Unix like Operating system and man linux distro. To get the information about package and command, we use the syntax yum install Package_name-Command_name.The abbreviation of Manual Page is man page . When you work in Unix like operating system,we generally need help and information about the package and…
In this tutorial we will learn about how to set user password by using encrypted password in command line.We assume you already know about how to simply set/reset password of user by using command (passwd username). In this tutorial,first we will encrypt the password in python interpreter then we use the output in one liner…
In this tutorial we will learn about linux command to find last modified and access date of a file/dir and filesystem.The command is very useful for troubleshooting purpose. Here we will use the stat command which display file or file system status. To find the last modified and access date of a file/dir/filesystem in linux,we…
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…
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…