tail:tldr:3a9c7

The command you provided is used to display the last part of a file. Here's how it works:

• tail is the command itself.
• --lines is an option used to specify the number of lines to display.
• ${count} is the variable placeholder, where you would provide the number of lines you want to display starting from the end of the file.
• ${filename} is another variable placeholder, where you would provide the name or path of the file you want to display.

For example, if you want to display the last 10 lines of a file named "example.txt", you would replace ${count} with 10 and ${filename} with "example.txt". The command would look like this:

tail --lines +10 example.txt

This would show the last 10 lines of the "example.txt" file. The + sign before the number indicates that it starts counting from that line number.

If you omit the + sign and only provide the count, like tail -n 10 example.txt, it would display the last 10 lines without including the line number specified.