base64:tldr:56bcc

This command is used to encode the value of the variable plain_text as base64. Here's a breakdown of the command:

• echo: This command is used to output some text or value.
• -n: This option is used to omit the trailing newline. By default, echo adds a newline character at the end of the output. -n prevents this behavior.
• "${plain_text}": This is the variable being passed to echo. It represents the plain text value that you want to encode as base64.
• |: This is known as a pipe operator, and it is used to redirect the output of the preceding command to the input of the following command.
• base64: This is the command that encodes the input as base64. It takes the output of echo and encodes it using the base64 algorithm.

In summary, this command takes the value of the variable plain_text, removes the trailing newline, and then encodes it as base64. The encoded value will be printed in the console output.