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plan9-tail

Langue: en

Version: 332660 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME

tail - deliver the last part of a file

SYNOPSIS

tail [ +-number[lbc][rf] ] [ file ]

tail [ -fr ] [ -n nlines ] [ -c nbytes ] [ 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 copied.

Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or bytes, according to the appended flag or Default is -10l (ten ell).

The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears.

The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed.

EXAMPLES

tail file
Print the last 10 lines of a file.
tail +0f file
Print a file, and continue to watch data accumulate as it grows.
sed 10q file
Print the first 10 lines of a file.

SOURCE

/src/cmd/tail.c

BUGS

Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length.

According to custom, option +number counts lines from 1, and counts blocks and bytes from 0.

Tail is ignorant of UTF.

Car nous devons soit admettre qu'il a une certaine étendue en dehors de
la matière, soit que Dieu ne pouvait pas créer une matière finie ; en
effet, nous ne pouvons pas concevoir une matière finie si ce n'est comme
entourée par une certaine étendue infinie.
-+- Henry More, Enchiridium metaphysicum,
part. I, chap. VI, 1671 -+-