In this post, you will learn to: State the two types of type casting. Describe implicit type casting. Describe explicit type casting Type Casting In any application, there may be situations where one data type may need to be converted into another data type. The typecasting feature in Java helps in such conversion. Type conversion […]
How to Use Comments in Java
Single-line Comments Comments help easy understanding of code. A single-line comment is used to document the functionality of a single line of code. The code below shows the Java program documented with single-line comments. There are two ways of using single-line comments: 1. Beginning-of-line comment – This type of comment can be placed before the […]
rpm Command Examples in Linux
The rpm command is used to manage RPM packages on Red Hat-derived distributions. It includes many different options, some of which are described in the following table. Option Used To -i {package name} Install the specified software. -e {package name} Erase (uninstall) the package. -v Enable verbose mode, providing more detail. -h Print hash marks […]
lsof Command Examples in Linux
The lsof command prints a list of all files that are currently opened to all active processes. This can include everything from a text file to a device file—any object that the system can parse as a file. You may be prevented from modifying a file if it is opened in another process. By using […]
grep Command Examples in Linux
The grep command, in its most basic form, is a search tool. Unlike find or locate, it is not limited to finding file names; it is most often used to search the contents of a file for a particular string of text. As output, grep displays each full line of the file that your search […]
ls Command Examples in Linux
At some point in time, you must have used the ls command if you use UNIX/Linux systems. ls is the most commonly used command by users of UNIX/Linux and in this post, we will discuss some of the examples of the Linux command. Suppose I want to list the files in a directory. I could […]
chattr Command Examples in Linux
The chattr command is used to change the attributes of a file or directory. The below table describes some of the options of the chattr command. Option Used To -R Recursiveli list attributes of directories and their contents -v {version} Set version number of file +i Make file as immutable -i Remove immutable attribute Syntax […]
chmod Command Examples in Linux
The chmod command enables you to modify the permissions of a file or directory. Only the owner of the file or directory or the system administrator can change the permissions of the object. Syntax The syntax of the chmod command is: # chmod [options] {mode} {file/directory name} chmod Command Options The chmod command supports different […]
Understanding user profile files in Linux – .bashrc, .bash_profile, /etc/profile, /etc/bashrc
User profiles Individual users have personal habits and preferences for their Linux work environment, and so a variety of profile file configurations are available to help them customize their experience. These customizations are referred to as profiles. An initial profile is created when the user account is created. There are many files and directories from […]
How to set and change Special Permissions In Linux
Special permissions on files and directories in linux are : SetUID, SetGID and Sticky bit. With the help of “chmod” command we can implement the special permissions on file and directories. SUID / Set User ID A program is executed with the file owner’s permissions (rather than with the permissions of the user who executes […]