zoukankan      html  css  js  c++  java
  • 【Linux】head命令

    用途

    它是用来显示开头或结尾某个数量的文字区块


    全称

    head的全称即为head


    参数

    -q :隐藏文件名

    -v :显示文件名

    -c :<字节>显示字节数

    -n :<行数>显示的行数


    案例


    案例一:显示文件/etc/man_db.conf 的前5行

    [root@bigdata ~]# head -n 5 /etc/man_db.conf
    #
    #
    # This file is used by the man-db package to configure the man and cat paths.
    # It is also used to provide a manpath for those without one by examining
    # their PATH environment variable. For details see the manpath(5) man page.


    案例二:显示文件/etc/man_db.conf 除了最后5行所有的内容

    [root@bigdata ~]# head -n -5 /etc/man_db.conf
    #
    #
    # This file is used by the man-db package to configure the man and cat paths.
    # It is also used to provide a manpath for those without one by examining
    # their PATH environment variable. For details see the manpath(5) man page.
    #

    …..

    案例三:显示文件/etc/man_db.conf 前100个字节

    [root@bigdata ~]# head -c 100 /etc/man_db.conf
    #
    #
    # This file is used by the man-db package to configure the man and cat paths.


    案例二:显示文件/etc/man_db.conf 除了最后100个字节外所有的内容

    [root@bigdata ~]# head -c -100 /etc/man_db.conf
    #
    #
    # This file is used by the man-db package to configure the man and cat paths.
    # It is also used to provide a manpath for those without one by examining
    # their PATH environment variable. For details see the manpath(5) man page.
    #
    # Lines beginning with `#' are comments and are ignored. Any combination of
    # tabs or spaces may be used as `whitespace' separators.
    #
    # There are three mappings allowed in this file:

    ……

  • 相关阅读:
    高并发下缓存失效问题及解决方案
    行为型设计模式
    Redisson
    行为型设计模式
    Docker 安装 Elasticsearch 和 Kibana
    行为型设计模式
    C# 使用 WebBrowser 实现 HTML 转图片功能
    .NET 程序下锐浪报表 (Grid++ Report) 的绿色发布指南
    .NET 程序员的 Playground :LINQPad
    Windows 服务器上的 WordPress 站点优化笔记
  • 原文地址:https://www.cnblogs.com/OliverQin/p/9474360.html
Copyright © 2011-2022 走看看