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tail:tldr:48a53
This command has three options:
-
-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 with10
, the command will display the last 10 lines of the file. -
-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 with2
, the command will wait for 2 seconds between each iteration of reading the file. This option is typically used with the-f
option. -
-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 withmylogfile.txt
, the command will continuously monitor the filemylogfile.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.