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.
tail [OPTION]... [FILE]...
- -c, –bytes=[+]NUM
output the last NUM bytes; or use -c +NUM to output starting with byte NUM of each file
-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.
with -f, terminate after process ID, PID dies
- -q, –quiet, –silent
never output headers giving file names
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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