About
tail is a filter program that prints the last ten lines of a standard input stream or a file. (Handy when viewing log files for diagnostic).
tail file.txt
The inverse program is the head program that prints the first lines.
It's part of the gnu utility package.
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Monitoring a file
Use the -f option:
tail -f file.txt
you get to see the end of the file peridocially (logfiles are good candidate)