ifconfig

  • 查看本机ip地址

    1. [root@hadoop1 桌面]# ifconfig
    2. eth0      Link encap:Ethernet  HWaddr 00:0C:29:9C:8A:27  
    3.         inet addr:192.168.58.128  Bcast:192.168.58.255  Mask:255.255.255.0

    关机重启

  • shutdown

    • shutdown -h now：立即关机
    • shutdown -h 1：1分钟后关机
    • shutdown -r now：立即重启
  • halt：关机
  • reboot：重启

  • sync：将内存数据同步到磁盘，关机或者重启前都应该执行一下这个命令

    man

  • man 要查询的指令

    [root@hadoop1 /]# man ls
LS(1)                            User Commands                           LS(1)
NAME
     ls - list directory contents
SYNOPSIS
     ls [OPTION]... [FILE]...
DESCRIPTION
     List information about the FILEs (the current directory by default).  Sort entries alphabetically if none of -cftuvSUX nor --sort.
     Mandatory arguments to long options are mandatory for short options too.
     -a, --all
            do not ignore entries starting with .
     -A, --almost-all
            do not list implied . and ..
     --author
            with -l, print the author of each file

    help

  • help 要查询的指令

    [root@hadoop1 /]# help cd
cd: cd [-L|-P] [dir]
  Change the shell working directory.

  Change the current directory to DIR.  The default DIR is the value of the
  HOME shell variable.

  The variable CDPATH defines the search path for the directory containing
  DIR.  Alternative directory names in CDPATH are separated by a colon (:).
  A null directory name is the same as the current directory.  If DIR begins
  with a slash (/), then CDPATH is not used.

  If the directory is not found, and the shell option `cdable_vars' is set,
  the word is assumed to be  a variable name.  If that variable has a value,
  its value is used for DIR.

  Options:
      -L    force symbolic links to be followed
      -P    use the physical directory structure without following symbolic
      links

  The default is to follow symbolic links, as if `-L' were specified.

  Exit Status:
  Returns 0 if the directory is changed; non-zero otherwise.

    cal

  • 日历

    [root@hadoop1 zsf]# cal
    一月 2021     
日 一 二 三 四 五 六
              1  2
3  4  5  6  7  8  9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31