ssh执行命令

1. 执行一条命令

   • ssh user@ip command

2. 执行多条命令

   • ssh user@ip "command1;command2"    #分号隔开

3. 关于转义

   • ssh user@ip 'echo $HOME'      #单引号，本机不转义，到目标机器执行
     ssh user@ip "echo $HOME"      #双引号，先在本机转义，到目标ip执行

   • 　[root@ricky01 ~]# ssh ricky02@192.168.56.101 'echo $HOME' #单引号，先不转义，到目标机器执行echo $HOME
       ricky02@192.168.56.101's password:
       /home/ricky02

     [root@ricky01 ~]# ssh ricky02@192.168.56.101 "echo $HOME" #双引号，先把$HOME转成/root，到目标机器执行echo /root
       ricky02@192.168.56.101's password:
       /root

4. 关于awk

   • ip a|grep 192.168*|awk '{ print $2 }'
     192.168.56.102/24      #本机可以正确执行

   • [root@ricky01 ~]# ssh 192.168.56.101 ip a|grep 192.168*|awk '{ print $2 }'   #单条命令，不加引号，可以执行
     root@192.168.56.101's password:
     192.168.56.101/24
     

   • [root@ricky01 ~]# ssh 192.168.56.101 'ip a|grep 192.168*|awk '{ print $2 }''  #加单引号，报错
     root@192.168.56.101's password:
     awk: cmd. line:1: {
     awk: cmd. line:1:  ^ unexpected newline or end of string

   • [root@ricky01 ~]# ssh 192.168.56.101 "ip a|grep 192.168*|awk '{ print $2 }'"  #加双引号，没有执行awk
     root@192.168.56.101's password:
         inet 192.168.56.101/24 brd 192.168.56.255 scope global dynamic enp0s8

   • [root@ricky01 ~]# ssh 192.168.56.101 "ip a|grep 192.168*|awk '{ print \$2 }'"  #双引号，$前加转义符号\，正确执行
     root@192.168.56.101's password:
     192.168.56.101/24

   • [root@ricky01 ~]# ssh 192.168.56.101 'ip a|grep 192.168*|awk '{ print \$2 }''  #单引号，$前加转义符号\，报错

     root@192.168.56.101's password:  awk: cmd. line:1: { awk: cmd. line:1: ^ unexpected newline or end of string