zcat:tldr:a1b8b

The command zcat ${file-txt-gz} is used to display the contents of a compressed text file in the terminal without actually decompressing the file.

Here's how the command works:

• ${file-txt-gz} is a placeholder or variable that represents the name of the compressed text file you want to display.
• The zcat command is a utility that is used to concatenate and display the contents of compressed files. zcat is specifically designed for compressed files in gzip format (files with a .gz extension).
• When you run the command, it expands the variable ${file-txt-gz} to the actual file name and then passes it as an argument to zcat.
• zcat recognizes the file as a compressed text file in gzip format and automatically decompresses and displays the contents in the terminal.

Note: The ${} syntax indicates the use of variables in shell scripting, and it is assumed that the variable ${file-txt-gz} has been defined with the appropriate file name beforehand.