Home » mariadb on ubuntu » UNIX/LINUX Command – tail

UNIX/LINUX Command – tail

NAME

tail—Output the last part of files

SYNOPSIS

tail [-c [+]N[bkm]] [-n [+]N] [-fqv] [–bytes=[+]N[bkm]] [–lines=[+]N] [–follow] [–quiet] [–silent] [–verbose] [–help] [–version] [file…]
tail [{-,+}Nbcfklmqv] [file…]

DESCRIPTION

This manual page documents the GNU version of tail. tail prints the last part (10 lines by default) of each given file; it reads from standard input if no files are given or when a filename of – is encountered. If more than one file is given, it prints a header consisting of the file’s name enclosed in ==> and <== before the output for each file.

The GNU tail can output any amount of data, unlike the UNIX version, which uses a fixed size buffer. It has no -r option (print in reverse). Reversing a file is really a different job from printing the end of a file; the BSD tail can only reverse files that are at most as large as its buffer, which is typically 32KB. A reliable and more versatile way to reverse files is the GNU tac command.

OPTIONS

tail accepts two option formats: the new one, in which numbers are arguments to the option letters, and the old one, in which a + or – and optional number precede any option letters.

If a number (N) starts with a +, tail begins printing with the Nth item from the start of each file, instead of from the end.

Options Description
-c N, –bytes N Tail by N bytes. N is a non-zero integer, optionally followed by one of the following characters to specify a different unit.Tail by N bytes. N is a non-zero integer, optionally followed by one of the following characters to specify a different unit.
b        512-byte blocks
k        1-kilobyte blocks
m       1-megabyte blocks
-f, –follow Loop forever, trying to read more characters at the end of the file, on the assumption that the file is growing. Ignored if reading from a pipe. If more than one file is given, tail prints a header whenever it gets output from a different file, to indicate which file that output is from.
-l, -n N, –lines N Tail by N lines. -l is only recognized using the old option format.
-q, –quiet, –silent Never print filename headers.
-v, –verbose Always print filename headers.
–help Print a usage message and exit with a non-zero status.
–version Print version information on standard output then exit.

Related Posts

UNIX/LINUX Command – rsync

UNIX/LINUX Command – rsync

NAME rsync – a fast, versatile, remote (and local) file-copying tool rsync Command SYNOPSIS Local: rsync [OPTION…] SRC… [DEST] Access via remote shell:Pull: rsync [OPTION…] [USER@]HOST:SRC… [DEST]Push: rsync [OPTION…] SRC… [USER@]HOST:DEST Access via rsync...

UNIX/LINUX Command – strip

UNIX/LINUX Command – strip

NAME strip—Discard symbols from object files. SYNOPSIS strip [ -Fbfdname|–target=bfdname ] [ -Ibfdname|–input-target=bfdname ] [ -Obfdname|–output-target=bfdname ] [-Rsectionname|–remove-section=sectionname ] [ -s|–strip-all ] [-S|-g|–strip-debug ][-x|–discard-all...

UNIX/LINUX Command – expand

UNIX/LINUX Command – expand

NAME expand—Convert tabs to spaces SYNOPSIS expand [–tab1[,tab2[,…]]] [–t tab1[,tab2[,…]]] [–i] [—tabs=tab1[,tab2[,…]]] [–initial] [–help] [–version] [file…] DESCRIPTION This manual page documents the GNU version of expand. expand writes the contents of each given...

UNIX/LINUX Command – uuencode

UNIX/LINUX Command – uuencode

NAME uuencode—Encode a binary fileuudecode—Decode a file created by uuencode SYNOPSIS uuencode [-m] [ file ] nameuudecode [-o outfile] [ file ]… DESCRIPTION uuencode and uudecode are used to transmit binary files over transmission mediums that do not support other...

Follow Us

Our Communities

The Ultimate Managed Hosting Platform
Load WordPress Sites in as fast as 37ms!

0 Comments

0 Comments

Submit a Comment

Your email address will not be published. Required fields are marked *

2 × 2 =

Shares