head [OPTION]... [FILE]...
!subtitle:功能
查看文件的开头。
!subtitle:类型
可执行文件（/usr/bin/head），属于 coreutils。
!subtitle:参数
OPTION 选项：
-c, --bytes=[-]NUM - 查看文件开头的 NUM 字节，如果使用负号，则表示查看最后 NUM 字节之前的内容
-n, --lines=[-]NUM - 查看文件开头的 NUM 行，如果使用负号，则表示查看最后 NUM 行之前的内容
-q, --quiet, --silent - 不打印包含文件名在内的头部信息
-v, --verbose - 打印包含文件名在内的头部信息
-z, --zero-terminated - 以空字符（\0）作为行的结尾，而不是换行符（\n）
--help - 显示帮助
--version - 显示版本
FILE - 文件列表，如果没有这个参数或指定为 -，则读取标准输入
$ man head | head -n 5 # 显示前 5 行
HEAD(1) User Commands HEAD(1)
NAME
head - output the first part of files
$ man head | head -n -10 # 显示除了后 10 行以外的内容
HEAD(1) User Commands HEAD(1)
NAME
head - output the first part of files
...
COPYRIGHT
Copyright © 2023 Free Software Foundation, Inc. License GPLv3+: GNU
GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
| 命令 | 说明 |
|---|---|
| tail | 查看文件末尾 |
| more | 分页查看文件内容 |
| less | 增强版文件分页阅读命令 |
HEAD(1) User Commands HEAD(1)
NAME
head - output the first part of files
SYNOPSIS
head [OPTION]... [FILE]...
DESCRIPTION
Print the first 10 lines of each FILE to standard output. With more
than one FILE, precede each with a header giving the file name.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options
too.
-c, --bytes=[-]NUM
print the first NUM bytes of each file; with the leading '-',
print all but the last NUM bytes of each file
-n, --lines=[-]NUM
print the first NUM lines instead of the first 10; with the
leading '-', print all but the last NUM lines of each file
-q, --quiet, --silent
never print headers giving file names
-v, --verbose
always print headers giving file names
-z, --zero-terminated
line delimiter is NUL, not newline
--help display this help and exit
--version
output version information and exit
NUM may have a multiplier suffix: b 512, kB 1000, K 1024, MB 1000*1000,
M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P,
E, Z, Y, R, Q. Binary prefixes can be used, too: KiB=K, MiB=M, and so
on.
AUTHOR
Written by David MacKenzie and Jim Meyering.
REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
COPYRIGHT
Copyright © 2023 Free Software Foundation, Inc. License GPLv3+: GNU
GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
tail(1)
Full documentation <https://www.gnu.org/software/coreutils/head>
or available locally via: info '(coreutils) head invocation'
GNU coreutils 9.4 April 2024 HEAD(1)