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echo:tldr:04010
The command echo "${Hello World}"
is used to display the text "Hello World" on the command line or console.
In this command, echo
is a command to output/display text. The text to be displayed is specified within quotes. The ${}
syntax is used for variables in many programming languages, but in this case, it doesn't represent a variable.
So, the double quotes " "
in this command simply prevent the shell from interpreting the space between "Hello" and "World" as a separator between two different arguments. It treats everything between the quotes as a single argument, which is then displayed by the echo
command.
Note that if you remove the double quotes, the command would be interpreted as echo Hello World
, where Hello
and World
would be treated as two separate arguments to the echo
command, and it would display them separately.