agetty command in Linux with Examples - GeeksforGeeks (2024)

Ccat – Colorize Cat Command Output command in Linux with Examples

ccat is a command-line tool for Linux and OSX, which is similar to the cat command in Linux. But the difference between cat and ccat is that the ccat shows the content of the file with the syntax highlighted. Currently, ccat supports the following programming languages. JavaScriptJavaRubyPythonGoCJSONInstallation of Ccat First, we are going to see

How to Display Command History in Linux | history Command

The command-line interface in Linux provides powerful tools for users, and mastering command history is essential for efficient navigation and retrieval of previously executed commands. The history command is a valuable utility that allows users to view and search through their command history. In this comprehensive guide, we will explore the vario

select command in Linux with examples

select command in Linux is used to create a numbered menu from which a user can select an option. If the user enters a valid option then it executes the set of command written in select block and then ask again to enter a number, if a wrong option is entered it does nothing. If user enters nothing and simply press 'enter' the option menu gets print

atrm command in Linux with examples

atrm command is used to remove the specified jobs. To remove a job, its job number is passed in the command. A user can only delete jobs that belong to him. Only superuser can delete any job even if that belongs to another user. Syntax: atrm [-V] job [job...] Options: -V : Used to print the version number atrm -V job : Job number of the job which i

expand Command in LINUX with examples

Whenever you work with files in LINUX there can be a situation when you are stuck with a file containing many tabs and whatever you need to do with a file requires that file with no tabs but with spaces. In this situation, the task looks quite simple if you are dealing with a small file but what if the file you are dealing with is very big or you n

rcp Command in Linux with examples

There comes a time while using LINUX when there is a need to copy some information stored in a file to another computer. This can be done simply using rcp command line utility . Obviously there exists some other methods to complete the above mentioned task which are more secure (like scp or rsync) but this command lets you do this in the simple way

unexpand command in Linux with Examples

To convert the leading spaces and tabs into tabs, there exists a command line utility called unexpand command. The unexpand command by default convert each spaces into tabs writing the produced output to the standard output. Here's the syntax of unexpand command : Syntax : $unexpand [OPTION]... [FILE]... where, OPTION refers to the options compatib

uniq command in Linux with examples

The linux uniq command is basically used to remove all repeated lines in a file. This command is used when a line is repeated multiple times and replace these multiple lines with one line. This command is designed to work on sorted files. Purpose : Remove repetitious lines from the sorted 'input-file' and send unique lines to the 'output-file'. If

anacron command in linux with examples

anacron command is used to execute commands periodically with a frequency specified in days. Its main advantage over cron is that it can be used on a machine which is not running continuously. In cron if a machine is not running on time of a scheduled job then it will skip it, but anacron is a bit different as it first checks for timestamp of the j

for command in Linux with Examples

for command in Linux is used to repeatedly execute a set of command for every element present in the list. Syntax: for NAME [in WORDS ... ] ; do COMMANDS; done Example: Options: help for : It displays help information.

autoheader command in Linux with Examples

autoheader command in Linux is used to create a template file of C "#define" or any other template header for configure to use. If the user will give autoheader an argument, it reads the standard input instead of reading configure.ac and also writes the header file to the standard output. This command scans the configure.ac file and figures out whi

expect command in Linux with Examples

expect command or scripting language works with scripts that expect user inputs. It automates the task by providing inputs. // We can install expect command using following if not installed // On Ubuntu $sudo apt install expect // On Redhat based systems $ yum install expect First we write a script that will be needing inputs from users and then we

function command in Linux with examples

The function is a command in Linux that is used to create functions or methods. It is used to perform a specific task or a set of instructions. It allows users to create shortcuts for lengthy tasks making the command-line experience more efficient and convenient. The function can be created in the user's current shell session or saved in the shell

fg command in Linux with examples

fg command in linux used to put a background job in foreground. Syntax: fg [job_spec] job_spec may be: %n : Refer to job number n. %str : Refer to a job which was started by a command beginning with str. %?str : Refer to a job which was started by a command containing str. %% or %+ : Refer to the current job. fg and bg will operate on this job if n

bg command in Linux with Examples

bg command in linux is used to place foreground jobs in background. Syntax: bg [job_spec ...] job_spec may be: %n : Refer to job number n. %str : Refer to a job which was started by a command beginning with str. %?str : Refer to a job which was started by a command containing str. %% or %+ : Refer to the current job. fg and bg will operate on this

Clear Command in Linux with Examples

clear is a standard Unix computer operating system command that is used to clear the terminal screen. This command first looks for a terminal type in the environment and after that, it figures out the terminfo database for how to clear the screen. And this command will ignore any command-line parameters that may be present. Also, the clear command

Continue Command in Linux with examples

continue is a command which is used to skip the current iteration in for, while, and until loop. It is used in scripting languages and shell scripts to control the flow of executions. It takes one more parameter [N], if N is mentioned then it continues from the nth enclosing loop. The syntax for the `continue` command in Linuxcontinue or continue [

hostid command in Linux with examples

hostid is a command in Linux that is used to display the Host's ID in hexadecimal format. It provides a quick and straightforward way to retrieve the host ID, allowing administrators to associate it with software licenses or perform system-specific operations. Syntax of `hostid` command in Linuxhostid [OPTION] Options provided by hostedhostid --hel

Dirname Command in Linux with Examples

dirname is a command in Linux that is used to remove the trailing forward slashes "/" from the NAME and prints the remaining portion. If the argument NAME does not contain the forward slash "/" then it simply prints dot ".". In other words, we can say that the `dirname` command is a useful tool for extracting the directory portion from a given path

sdiff command in Linux with Examples

sdiff command in linux is used to compare two files and then writes the results to standard output in a side-by-side format. It displays each line of the two files with a series of spaces between them if the lines are identical. It displays greater than sign if the line only exists in the file specified by the File2 parameter, and a | (vertical bar

factor command in Linux with examples

The factor command in Linux is used to print the prime factors of the given numbers, either given from command line or read from standard input. The numbers given through standard input may be delimited by tabs, spaces or newlines. Syntax: factor [NUMBER] Factor 100 (non-prime number): We get the prime factors 2 and 5 that make up 100. Factor 13 (p

chpasswd command in Linux with examples

chpasswd command is used to change password although passwd command can also do same. But it changes the password of one user at a time so for multiple users chpasswd is used. Below figure shows the use of passwd command. Using passwd we are changing the password of the guest user. Here first you have to enter the password of the currently signed u

dir command in Linux with examples

dir command in Linux is used to list the contents of a directory. How is dir command different from ls? dir command differs from ls command in the format of listing contents that is in default listing options. By default, dir command lists the files and folders in columns, sorted vertically and special characters are represented by backslash escape

eval command in Linux with Examples

eval is a built-in Linux command which is used to execute arguments as a shell command. It combines arguments into a single string and uses it as an input to the shell and execute the commands. Syntax eval [arg ...] Example: In the below figure, you can see that cd Desktop command is stored in a variable "CD" as a shell command. Now you can use thi

lsmod command in Linux with Examples

lsmod command is used to display the status of modules in the Linux kernel. It results in a list of loaded modules. lsmod is a trivial program which nicely formats the contents of the /proc/modules, showing what kernel modules are currently loaded. Syntax: lsmod Example: Run lsmod at the command line to list all active kernel modules. lsmod Output:

emacs command in Linux with examples

Introduction to Emacs Editor in Linux/Unix Systems: The Emacs is referred to a family of editors, which means it has many versions or flavors or iterations. The most commonly used version of Emacs editor is GNU Emacs and was created by Richard Stallman. The main difference between text editors like vi, vim, nano, and the Emacs is that is faster, po

arch command in Linux with examples

arch command is used to print the computer architecture. Arch command prints things such as "i386, i486, i586, alpha, arm, m68k, mips, sparc, x86_64, etc. Syntax: arch [OPTION] Example: Options: arch --help : It displays help information. arch --version : It displays version information.

builtin command in Linux with examples

builtin command is used to run a shell builtin, passing it arguments(args), and also to get the exit status. The main use of this command is to define a shell function having the same name as the shell builtin by keeping the functionality of the builtin within the function. Syntax: builtin [shell-builtin [arg ..]] Example: Here, we are creating a f

dc command in Linux with examples

dc command in Linux is used to evaluate arithmetic expressions. It evaluates expressions in the form of a postfix expression. Entering a number pushes it into the stack and entering an operator evaluates an expression and pushes the result back into the stack. It can evaluate +, -, /, *, %, ^. Different commands can be used to manipulate stack. Syn