linux tail command tutorial: tail syntax and tail examples

linux tail command — output the last part of files.

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.

The linux tail command corresponds to the linux head command.

syntax

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

options

  • -c, –bytes=[+]NUM
    output the last NUM bytes; or use -c +NUM to output starting with byte NUM of each file
  • -f
    -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the input.
  • -n, –lines=[+]NUM
    output the last NUM lines.
  • –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

linux tail examples

Display the last 10 lines of the file

➜  ~ tail /var/log/dmesg

Display the last 3 lines of file content

➜  ~ tail -3 /var/log/dmesg

Tail skip first N lines

from line 20 to the end of the file:

➜  ~ tail +20 /var/log/dmesg

To monitor the write growth of log files

tail-f is usually used for system management to monitor logs

➜  ~ tail -f /var/log/dmesg

use tail with pipes(|)

Display the last 2 lines of the first 10 lines of the file dmesg

➜  ~ head -10 /var/log/dmesg | tail -2 

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