Getting a line of a file by number

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LEARN ABOUT FREEBSD

tail

TAIL(1) 						    BSD General Commands Manual 						   TAIL(1)

NAME

     tail -- display the last part of a file

SYNOPSIS

     tail [-F | -f | -r] [-q] [-b number | -c number | -n number] [file ...]

DESCRIPTION

     The tail utility displays the contents of file or, by default, its standard input, to the standard output.

     The display begins at a byte, line or 512-byte block location in the input.  Numbers having a leading plus ('+') sign are relative to the
     beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input.  Numbers having a leading minus ('-') sign
     or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input.	The default start-
     ing location is ``-n 10'', or the last 10 lines of the input.

     The options are as follows:

     -b number
	     The location is number 512-byte blocks.

     -c number
	     The location is number bytes.

     -f      The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
	     input.  The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.

     -F      The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated.  The
	     file is closed and reopened when tail detects that the filename being read from has a new inode number.

	     If the file being followed does not (yet) exist or if it is removed, tail will keep looking and will display the file from the begin-
	     ning if and when it is created.

	     The -F option is the same as the -f option if reading from standard input rather than a file.

     -n number
	     The location is number lines.

     -q      Suppresses printing of headers when multiple files are being examined.

     -r      The -r option causes the input to be displayed in reverse order, by line.	Additionally, this option changes the meaning of the -b,
	     -c and -n options.  When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
	     instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display.  The default for the -r
	     option is to display all of the input.

     If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where XXX is the name of
     the file unless -q flag is specified.

EXIT STATUS

     The tail utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     To display the last 500 lines of the file foo:

	   $ tail -n 500 foo

     Keep /var/log/messages open, displaying to the standard output anything appended to the file:

	   $ tail -f /var/log/messages

SEE ALSO

     cat(1), head(1), sed(1)

STANDARDS

     The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification.  In particular, the -F, -b and -r
     options are extensions to that standard.

     The historic command line syntax of tail is supported by this implementation.  The only difference between this implementation and historic
     versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e., ``-r
     -c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
     ignore the -c option and display the last 4 lines of the input.

HISTORY

     A tail command appeared in PWB UNIX.

BSD
								  March 16, 2013							       BSD

Shell Programming and Scripting