How To use Linux tail command with examples

The tail command is a command-line utility for outputting the last part of files given to it via standard input. It writes results to standard output. By default tail returns the last ten lines of each file that it is given. It may also be used to follow a file in real-time and watch as new lines are written to it.

1. How do you use the tail command?
2. What does tail do in Linux?
3. Which command in Linux with examples?
4. How do you use head and tail command in Linux?
5. How do you grep in tail command?
6. How do you continuously tail a file in Linux?
7. What is PS EF command in Linux?
8. How do you stop the tail command in Linux?
9. How do I grep last 10 lines in Linux?
10. What is a Linux command?
11. What does R mean in Linux?
12. How do I learn Linux commands?

How do you use the tail command?

How to Use the Tail Command

1. Enter the tail command, followed by the file you'd like to view: tail /var/log/auth.log. ...
2. To change the number of lines displayed, use the -n option: tail -n 50 /var/log/auth.log. ...
3. To show a real-time, streaming output of a changing file, use the -f or --follow options: tail -f /var/log/auth.log.

What does tail do in Linux?

The tail command, as the name implies, print the last N number of data of the given input. By default it prints the last 10 lines of the specified files. If more than one file name is provided then data from each file is precedes by its file name.

Which command in Linux with examples?

which command in Linux is a command which is used to locate the executable file associated with the given command by searching it in the path environment variable. It has 3 return status as follows: 0 : If all specified commands are found and executable.

How do you use head and tail command in Linux?

They are, by default, installed in all Linux distributions. As their names imply, the head command will output the first part of the file, while the tail command will print the last part of the file. Both commands write the result to standard output.

How do you grep in tail command?

1. try to do one pipe by one pipe, change the sequence, do tail -f file|grep -v "Y" . if the output is ok then proceed to append grep "X" . – Aizuddin Zali Oct 13 '15 at 13:16.
2. How to 'grep' a continuous stream? – phuclv Jan 18 '18 at 8:07.

How do you continuously tail a file in Linux?

The tail command is fast and simple. But if you want more than just following a file (e.g., scrolling and searching), then less may be the command for you. Press Shift-F. This will take you to the end of the file, and continuously display new contents.

What is PS EF command in Linux?

This command is used to find the PID (Process ID, Unique number of the process) of the process. Each process will have the unique number which is called as PID of the process.

How do you stop the tail command in Linux?

In less , you can press Ctrl-C to end forward mode and scroll through the file, then press F to go back to forward mode again. Note that less +F is advocated by many as a better alternative to tail -f .

How do I grep last 10 lines in Linux?

The tail command displays, by default, the last 10 lines of a text file in Linux. This command can be very useful when examining recent activity in log files. In the picture above you can see that the last 10 lines of the /var/log/messages file were displayed. Another option that you will find handy is the -f option.

What is a Linux command?

Linux is a Unix-Like operating system. All the Linux/Unix commands are run in the terminal provided by the Linux system. This terminal is just like the command prompt of Windows OS. Linux/Unix commands are case-sensitive. The terminal can be used to accomplish all Administrative tasks.

What does R mean in Linux?

-r, --recursive Read all files under each directory, recursively, following symbolic links only if they are on the command line. This is equivalent to the -d recurse option.

How do I learn Linux commands?

Linux Commands

1. ls — Use the "ls" command to know what files are in the directory you are in. ...
2. cd — Use the "cd" command to go to a directory. ...
3. mkdir & rmdir — Use the mkdir command when you need to create a folder or a directory. ...
4. rm - Use the rm command to delete files and directories.