src/usr.bin/tail/tail.1 - diff

Return to tail.1 CVS log

Up to [local] / src / usr.bin / tail

Diff for /src/usr.bin/tail/tail.1 between version 1.9 and 1.10

version 1.9, 2000/03/11 21:40:04

version 1.10, 2000/10/07 14:32:15

Line 49

.Oo

.Fl b Ar number |

.Fl c Ar number |

.Fl n Ar number

.Fl n Ar number |

.Fl Ns Ar number

.Oc

.Op Ar file ...

.Sh DESCRIPTION

Line 59

Line 60

.Ar file

or, by default, its standard input, to the standard output.

.Pp

The display begins at a byte, line or 512-byte block location in the

The display begins at a byte, line, or 512-byte block location in the

input.

Numbers having a leading plus

.Pq Ql +

Line 87

Line 88

The location is

.Ar number

bytes.

.It Xo Fl n Ar number No |\

.Fl Ns Ar number

.Xc

The location is

.Ar number

lines.

.It Fl f

The

Do not stop when end-of-file is reached, but rather to wait for additional

.Fl f

option causes

.Nm

to not stop when end-of-file is reached, but rather to wait for additional

data to be appended to the input.

If the file is replaced (i.e., the inode number changes),

.Nm

will reopen the file and continue.

If the file is truncated,

.Nm

will reset its position back to the beginning.

will reset its position to the beginning.

This makes

.Nm

more useful for watching log files that may get rotated.

The

.Fl f

option is ignored if the standard input is a pipe, but not if it is a FIFO.

.It Fl n Ar number

The location is

.Ar number

lines.

.It Fl r

The

.Fl r

option causes the input to be displayed in reverse order, by line.

Additionally, this option changes the meaning of the

.Fl b ,

.Fl c

.Fl c ,

and

.Fl n

options.

When the

.Fl 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

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

.Fl r

Line 140

Line 139

The

.Nm

utility exits 0 on success or >0 if an error occurred.

.Sh EXAMPLES

To display the last 500 lines of the file

.Ar foo :

.Pp

.Dl $ tail -500 foo

.Pp

Keep

.Pa /var/log/messages

open, displaying to the standard output anything appended to the file:

.Pp

.Dl $ tail -f /var/log/messages

.Sh SEE ALSO

.Xr cat 1 ,

.Xr head 1 ,