tail:tldr:48a53

This command has three options:

1. -n ${8}: Specifies the number of lines to display from the end of the file. The ${8} represents a placeholder for a variable, which should be replaced with the desired number of lines. For example, if ${8} is replaced with 10, the command will display the last 10 lines of the file.

2. -s ${10}: Sets the sleep interval between each iteration of reading the file. The ${10} represents another placeholder for a variable, which should be replaced with the desired sleep interval value in seconds. For example, if ${10} is replaced with 2, the command will wait for 2 seconds between each iteration of reading the file. This option is typically used with the -f option.

3. -f ${filename}: Specifies the file to be continuously monitored for new changes. The ${filename} represents a placeholder for the actual file name. For example, if ${filename} is replaced with mylogfile.txt, the command will continuously monitor the file mylogfile.txt for new changes and display them in real-time.

In summary, this command will display the specified number of lines from the end of the file and continuously monitor the file for any new changes, displaying them in real-time with a specified sleep interval between each iteration.