#Bash 的 head 命令

head [OPTION]... [FILE]...

功能

查看文件的开头。

类型

可执行文件（/usr/bin/head），属于 coreutils。

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

#示例

$ 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>.

#相关命令

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

#推荐阅读

#手册

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)