Shulou(Shulou.com)06/02 Report--

Today, I will talk to you about how to use the head command in Linux. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.

The head command prints the first 10 lines of each file to standard output. For multiple files, precede each file with a header that gives the file name. If there is no file, or if the file is -, the standard input is read.

Use the head command

Use head to display the first ten lines of / etc/passwd:

[root@localhost ~] # head / etc/passwdroot:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/sbin/nologinsync:x:5:0:sync:/sbin:/bin/syncshutdown:x:6:0 : shutdown:/sbin:/sbin/shutdownhalt:x:7:0:halt:/sbin:/sbin/haltmail:x:8:12:mail:/var/spool/mail:/sbin/nologinoperator:x:11:0:operator:/root:/sbin/nologin

How to display the specified number of rows

Use the-n command to display the specified number of lines, or you can omit the letter n and use only-and numbers (there is no space between the numbers and -).

For example, use the-n parameter to display the first five lines of / etc/passwd:

[root@localhost] # head-n 5 / etc/passwdroot:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

View multiple files

If multiple files are provided as input to the head command, it displays the first ten lines of each file. The following example uses the head command to display the first two lines of the / etc/passwd and / etc/shadow files:

[root@localhost ~] # head-n 2 / etc/passwd / etc/shadow== > / etc/passwd / etc/shadow

What is Linux system Linux is a free-to-use and free-spread UNIX-like operating system, is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

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