The Linux command is a utility of the Linux operating system. All basic and advanced tasks can be done by executing commands. Linux is fun, at the end you will believe that Linux is a fun box.

1} sl command → SL means Steam Locomotive, used to run a train in terminal.

2} cowsay command → An ASCII cow in the terminal will say whatever you want.

In Linux, espeak-ng is a software speech synthesizer for English, and some other languages. It contain tons of options and its synopsis is as follows,

espeak-ng [options] [words]

Available options in “espeak-ng” ::

To Speak a sentence in English(by default) Voice :: espeak-ng “Test”

To make system speak in different language :: -v <voice_name>
Ex, for Afrikaans ::

Zenity is a program/command in Linux which will create simple dialogs that interact graphically with user. Zenity contains tons of options and its synopsis is as follows,

zenity [options]

Dialog Options in Zenity ::

To display calendar :: --calendar

To display text dialog :: --entry