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NAME | SYNOPSIS | DESCRIPTION | AUTHOR | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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TAIL(1) User Commands TAIL(1)
tail - output the last part of files
tail [OPTION]... [FILE]...
Print the last 10 lines of each FILE to standard output. With
more than one FILE, precede each with a header giving the file
name.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short
options too.
-c, --bytes=[+]NUM
output the last NUM bytes; or use -c +NUM to output
starting with byte NUM of each file
-f, --follow[={name|descriptor}]
output appended data as the file grows;
an absent option argument means 'descriptor'
-F same as --follow=name --retry
-n, --lines=[+]NUM
output the last NUM lines, instead of the last 10; or use
-n +NUM to skip NUM-1 lines at the start
--max-unchanged-stats=N
with --follow=name, reopen a FILE which has not
changed size after N (default 5) iterations to see if it
has been unlinked or renamed (this is the usual case of
rotated log files); with inotify, this option is rarely
useful
--pid=PID
with -f, terminate after process ID, PID dies; can be
repeated to watch multiple processes
-q, --quiet, --silent
never output headers giving file names
--retry
keep trying to open a file if it is inaccessible
-s, --sleep-interval=N
with -f, sleep for approximately N seconds (default 1.0)
between iterations; with inotify and --pid=P, check
process P at least once every N seconds
-v, --verbose
always output headers giving file names
-z, --zero-terminated
line delimiter is NUL, not newline
--help display this help and exit
--version
output version information and exit
NUM may have a multiplier suffix: b 512, kB 1000, K 1024, MB
1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and
so on for T, P, E, Z, Y, R, Q. Binary prefixes can be used, too:
KiB=K, MiB=M, and so on.
With --follow (-f), tail defaults to following the file
descriptor, which means that even if a tail'ed file is renamed,
tail will continue to track its end. This default behavior is
not desirable when you really want to track the actual name of
the file, not the file descriptor (e.g., log rotation). Use
--follow=name in that case. That causes tail to track the named
file in a way that accommodates renaming, removal and creation.
Written by Paul Rubin, David MacKenzie, Ian Lance Taylor, and Jim
Meyering.
GNU coreutils online help:
<https://www.gnu.org/software/coreutils/>
Report any translation bugs to
<https://translationproject.org/team/>
Copyright © 2024 Free Software Foundation, Inc. License GPLv3+:
GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute
it. There is NO WARRANTY, to the extent permitted by law.
head(1)
Full documentation <https://www.gnu.org/software/coreutils/tail>
or available locally via: info '(coreutils) tail invocation'
This page is part of the coreutils (basic file, shell and text
manipulation utilities) project. Information about the project
can be found at ⟨http://www.gnu.org/software/coreutils/⟩. If you
have a bug report for this manual page, see
⟨http://www.gnu.org/software/coreutils/⟩. This page was obtained
from the tarball coreutils-9.5.tar.xz fetched from
⟨http://ftp.gnu.org/gnu/coreutils/⟩ on 2024-06-14. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
GNU coreutils 9.5 March 2024 TAIL(1)
Pages that refer to this page: head(1), pmcd(1), pmdalogger(1), pmdasystemd(1), pmdaweblog(1), pon(1)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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