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[pdutils] / utils / tail / tail.1

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-.TH TAIL 1 "2008-1.01" "pdcore utilities" "User Commands"
-.SH NAME
-tail \- copy the last part of a file
-.SH SYNOPSIS
-.B tail
-[-f] [-c number | -n number] [file]
-.SH DESCRIPTION
-Copy the input file to standard output, starting from a specified location.
-.SH OPTIONS
-.TP
--f
-Follow the file; keep updating tail's output as the input file grows. Note that
-this option is only available for regular files and FIFOs that are named as
-the 'file' operand, and will be ignored for other inputs (such as unnamed
-pipes).
-.TP
--c number
-Byte offset of the input file at which output will commence.
-.TP
--n number
-Line offset of the input file at which output will commence.
-.P
-Byte and line offsets commence at the value 1. If 'number' includes a
-leading '+', the offset is from the start of the input file. If 'number'
-includes a leading '-' or has no prefix, it indicates that the desired
-offset is backwards from the end of the input file.
-.P
-For example, '-n +3' will output the contents of the input file commencing from
-the third line; '-c 20' or '-c -20' starts output twenty bytes prior to the end
-of the input file.
-.P
-For byte offsets, a 'number' value of zero is not permitted. For line offsets,
-the POSIX standard states that the option '-n 0' is valid, but outputs nothing,
-whilst '-n +0' is invalid.
-.P
-Options '-c' and '-n' are mutually exclusive. If neither is specified,
-the default behaviour of tail is to output the last ten lines of the input
-file, as if it had been invoked with the option '-n 10'.
-.SH OPERANDS
-.TP
-file
-Input file. If none provided, or the filename '-' is passed to tail,
-standard input will be used.
-.SH "AUTHORITATIVE DOCUMENTATION"
-<http://www.opengroup.org/onlinepubs/9699919799/utilities/tail.html>
-.SH VERSION AND COMPLIANCE
-Utility version 1.01
-.P
-Functional compliance with POSIX:2008 (IEEE Std 1003.1-2008;
-Shell and Utilities, Base Specifications Issue 7).
-.SH UNLICENSE
-This is free and unencumbered software released into the public domain,
-provided "as is", without warranty of any kind, express or implied. See the
-file UNLICENSE and the website <http://unlicense.org> for further details.