Linux Head Command

The head command is a command-line utility for outputting the first part of files given to it via standard input. It writes results to standard output. By default head returns the first ten lines of each file that it is given.

1. How do you use the head command?
2. How do I head a file in Linux?
3. What is head and tail command in Linux?
4. What does head do in Unix?
5. Is command in Linux?
6. How do I get top 100 lines in Linux?
7. How do you display the top 5 lines in Unix?
8. What is difference between comm and CMP command?
9. Which command is used to copy?
10. What is head in shell script?
11. How do I read a file in Linux?
12. What is PS EF command in Linux?

How do you use the head command?

How to Use the Head Command

1. Enter the head command, followed by the file of which you'd like to view: head /var/log/auth.log. ...
2. To change the number of lines displayed, use the -n option: head -n 50 /var/log/auth.log. ...
3. To show the beginning of a file up to a specific number of bytes, you may use the -c option: head -c 1000 /var/log/auth.log.

How do I head a file in Linux?

Manage Files Effectively using head, tail and cat Commands in...

1. head Command. The head command reads the first ten lines of a any given file name. The basic syntax of head command is: head [options] [file(s)] ...
2. tail Command. The tail command allows you to display last ten lines of any text file. ...
3. cat Command. The 'cat' command is most widely used, universal tool.

What is 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.

What does head do in Unix?

head is a program on Unix and Unix-like operating systems used to display the beginning of a text file or piped data.

Is command in Linux?

The Linux command is a utility of the Linux operating system. All basic and advanced tasks can be done by executing commands. The commands are executed on the Linux terminal. The terminal is a command-line interface to interact with the system, which is similar to the command prompt in the Windows OS.

How do I get top 100 lines in Linux?

Type the following head command to display first 10 lines of a file named “bar.txt”:

1. head -10 bar.txt.
2. head -20 bar.txt.
3. sed -n 1,10p /etc/group.
4. sed -n 1,20p /etc/group.
5. awk 'FNR <= 10' /etc/passwd.
6. awk 'FNR <= 20' /etc/passwd.
7. perl -ne'1..10 and print' /etc/passwd.
8. perl -ne'1..20 and print' /etc/passwd.

How do you display the top 5 lines in Unix?

head -15 /etc/passwd

To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file. Try using tail to look at the last five lines of your .

What is difference between comm and CMP command?

Different ways of comparing two files in Unix

#1) cmp: This command is used to compare two files character by character. Example: Add write permission for user, group and others for file1. #2) comm: This command is used to compare two sorted files.

Which command is used to copy?

The command copies computer files from one directory to another.
...
copy (command)

What is head in shell script?

It is the complementary of Tail command. The head command, as the name implies, print the top N number of data of the given input. By default, it prints the first 10 lines of the specified files. If more than one file name is provided then data from each file is preceded by its file name.

How do I read a file in Linux?

5 commands to view files in Linux

1. Cat. This is the simplest and perhaps the most popular command to view a file in Linux. ...
2. nl. The nl command is almost like the cat command. ...
3. Less. Less command views the file one page at a time. ...
4. Head. Head command is another way of viewing text file but with a slight difference. ...
5. Tail.

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.