head:tldr:27370

The command "head -n ${count} ${filename}" is a shell command used to display the first N lines of a file. Here's a breakdown of the components:

• "head" is the command itself, which is used to display the beginning part of a file.
• "-n" is an option for the "head" command, specifying the number of lines to display.
• "${count}" is a variable placeholder that should be replaced with a specific number denoting the desired count of lines to be displayed. For example, if you want to display the first 10 lines of a file, you would replace "${count}" with "10".
• "${filename}" is another variable placeholder that should be replaced with the actual name of the file you want to examine. For instance, if the file you want to view is called "example.txt", you would replace "${filename}" with "example.txt".

So, when you substitute the placeholders with real values, the command would look like "head -n 10 example.txt", which means display the first 10 lines of the file "example.txt".