tail - output the last part of files
[-c [+]N[bkm]] [-n [+]N] [-fqv] [--bytes=[+]N[bkm]] [--lines=[+]N]
[--follow] [--quiet] [--silent] [--verbose] [--help] [--version]
This manual page
documents the GNU version of
prints the last part (10 lines by default) of each given file; it
reads from standard input if no files are given or when a filename of
`-' is encountered. If more than one file is given, it prints a
header consisting of the file's name enclosed in `==>' and `<=='
before the output for each file.
can output any amount of data, unlike the Unix version, which uses a
fixed size buffer. It has no
option (print in reverse). Reversing a file is really a different job
from printing the end of a file; the BSD
can only reverse files that are at most as large as its buffer, which
is typically 32k. A reliable and more versatile way to reverse files is
accepts two option formats: the new one, in which numbers are
arguments to the option letters, and the old one, in which a `+' or
`-' and optional number precede any option letters.
If a number (`N') starts with a `+',
begins printing with the Nth item from the start of each file, instead
of from the end.
-c N, --bytes N
Tail by N bytes. N is a nonzero integer, optionally followed by one
of the following characters to specify a different unit.
Loop forever trying to read more characters at the end of the file, on
the assumption that the file is growing. Ignored if reading from a
pipe. If more than one file is given,
prints a header whenever it gets output from a different file, to indicate
which file that output is from.
-l, -n N, --lines N
Tail by N lines.
is only recognized using the old option format.
-q, --quiet, --silent
Never print filename headers.
Always print filename headers.
Print a usage message and exit with a status code indicating success.
Print version information on standard output then exit.