Linux文本处理命令-tail指令的帮助文档

TAIL(1)                                 User Commands                                TAIL(1)

NAME
       tail - output the last part of files

SYNOPSIS
       tail [OPTION]... [FILE]...

DESCRIPTION
       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 output
              starting with line NUM

       --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 op‐
              tion is rarely useful

       --pid=PID
              with -f, terminate after process ID, PID dies

       -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.   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.

AUTHOR
       Written by Paul Rubin, David MacKenzie, Ian Lance Taylor, and Jim Meyering.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright ? 2020 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 WAR‐
       RANTY, to the extent permitted by law.

SEE ALSO
       head(1)

       Full documentation <https://www.gnu.org/software/coreutils/tail>
       or available locally via: info '(coreutils) tail invocation'

GNU coreutils 8.32                      January 2023                                 TAIL(1)