TAIL(C) UNIX System V
Name
tail - displays the last part of a file
Syntax
tail [ +[number][lbc] [ -f ] ] [ file ]
Description
tail copies the named file to the standard output beginning
at a designated place. If no file is named, the standard
input is used.
Copying begins at distance +number from the beginning, or
-number from the end of the input (if number is null, the
value 10 is assumed). Number is counted in units of lines,
blocks, or characters, according to the appended option l,
b, or c. When no units are specified, counting is by lines.
With the -f (``follow'') option, if the input file is not a
pipe, the program will not terminate after the line of the
input file has been copied, but will enter an endless loop,
wherein it sleeps for a second and then attempts to read and
copy further records from the input file. Thus it may be
used to monitor the growth of a file that is being written
by some other process. For example, the command:
tail -f file
will print the last ten lines of file, followed by any lines
that are appended to file between the time tail is initiated
and killed.
See Also
dd(C)
Notes
Tails relative to the end of the file are kept in a buffer,
and thus are limited to approximately 300 lines.
Unpredictable results can occur if character special files
are ``tailed''.
Standards Conformance
tail is conformant with:
AT&T SVID Issue 2, Select Code 307-127;
and The X/Open Portability Guide II of January 1987.
(printed 8/24/89) TAIL(C)