tail 命令

常用示例

说明

tail outputs the last part of files. By default, it shows the last 10 lines. It's commonly used to view log files and monitor file changes in real-time. The -f (follow) option is particularly useful for monitoring log files. Tail continues reading as new lines are appended, displaying them immediately. Using -n +N outputs starting from line N rather than the last N lines. This is useful for skipping headers or combining with head for extracting specific ranges. Multiple files can be specified; tail shows headers indicating which file output comes from.

参数

-n _N_, --lines=_N_

Output last N lines (or +N for starting from line N)

-c _N_, --bytes=_N_

Output last N bytes (or +N for starting from byte N)

-f, --follow

Output appended data as file grows

-F

Same as --follow=name --retry

--retry

Keep trying to open file if inaccessible

-s _N_, --sleep-interval=_N_

Sleep N seconds between iterations with -f

--pid=_PID_

With -f, terminate after process PID dies

-q, --quiet

Never output headers with file names

-v, --verbose

Always output headers with file names