tail.1

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)tail.1	2.5	8/18/87
.TH tail 1 
.SH Name
tail \- print lines from file
.SH Syntax
.B tail
[ \(+-[\fInumber\fP][\fBlbcr\fR] ]
[ \fIfile\fP ]
.PP
.B tail
[ \(+-[\fInumber\fP][\fBlbcf\fR] ]
[ \fIfile\fP ]
.SH Description
.NXR "tail command"
.NXR "file" "copying portions"
The
.PN tail
command copies the named file to the standard output beginning
at a designated place.
If no file is named, the standard input is used.
.PP
Copying begins at distance
.I +number
from the beginning, or
.I \-number
from the end of the input.
The
.I number
is counted in units of lines, blocks or characters,
according to the appended option
.B l,
.B b
or
.B c.
When no units are specified, counting is by lines.
.PP
Specifying
.B r
causes 
.PN tail
to print lines from the end of the file in reverse order.
The default for
.B r
is to print the entire file this way.
Specifying
.B f
causes
.PN tail
not to quit at end of 
.I file , 
but rather to reread the file repeatedly.
.SH Restrictions
The results of the 
.PN tail 
command are unpredictable
with character special files.
.SH See Also
dd(1)