ssh執行命令

1. 執行一條命令

   • ssh user@ip command

2. 執行多條命令

   • ssh user@ip "command1;command2"    #分號隔開

3. 關於轉義

   • ssh user@ip 'echo $HOME'      #單引號，本機不轉義，到目標機器執行
     ssh user@ip "echo $HOME"      #雙引號，先在本機轉義，到目標ip執行

   • 　[root@ricky01 ~]# ssh ricky02@192.168.56.101 'echo $HOME' #單引號，先不轉義，到目標機器執行echo $HOME
       ricky02@192.168.56.101's password:
       /home/ricky02

       [root@ricky01 ~]# ssh ricky02@192.168.56.101 "echo $HOME" #雙引號，先把$HOME轉成/root，到目標機器執行echo /root
       ricky02@192.168.56.101's password:
       /root

4. 關於awk

   • ip a|grep 192.168*|awk '{ print $2 }'
     192.168.56.102/24      #本機可以正確執行

   • [root@ricky01 ~]# ssh 192.168.56.101 ip a|grep 192.168*|awk '{ print $2 }'   #單條命令，不加引號，可以執行
     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 }''  #加單引號，報錯
     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 }'"  #加雙引號，沒有執行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 }'"  #雙引號，$前加轉義符號\，正確執行
     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 }''  #單引號，$前加轉義符號\，報錯

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