One Linux command per day (--tail) command

The tail command writes the file to standard output starting at the specified point. With the-f option of the tail command, you can easily see the log files that are being changed, TAIL-F filename will display the most up-to-date content on the screen, and constantly refresh, you are seeing the latest file content. can be used as monitoring or viewing status and so on.

1. Command format:

tail [Required Parameters] [select parameters] [file]

2. Command function:

Used to display the content at the end of the specified file, and is processed as input when the file is not specified. Common view log files.

3. Command parameters:

-F Loop Read

-Q does not display processing information

-V displays detailed processing information

Number of-c< > bytes displayed

-n< lines > Display rows

--pid=pid and-F, which means it ends after the process id,pid dead.

-S--sleep-interval=s is combined with-F to indicate sleep s seconds at each repetition interval

-Q--quiet--silent never output the header of the file name

4. Usage examples:

Example 1: Displaying the end of a file

Command:

Tail-n 5 Log.txt Display the last 5 lines of the file

Example 2: Looping through the contents of a file

Command:

Tail-f Log.txt

Ping 192.168.0.1 > Ping.log &//Ping remote host in background and output to file Ping.log; This technique can be used for more than one profile monitoring. Use CTRL + C to terminate.

Example 3: Displaying a file starting from line 5th

Command:

Tail-n +5 Log.txt

<end>

The end of the first learning task: The file directory Operations command. Just today Saturday, hey, tonight is going to have a good meal.

One Linux command per day (--tail) command