关于SSH 远程执行命令你要知道的二三事

...
# Copy script to remote host
spawn scp -o "StrictHostKeyChecking no" shell_script.sh username@hostname:~/
expect "*assword*"
send "passwordn"
expect "*100%*"
expect eof

# Execute the shell script at remote host
spawn ssh -o "StrictHostKeyChecking no" username@hostname
expect "*assword*"
send "passwordn"
expect "*$*"
send "sh shell_script.shn"
......

支持执行 sudo 命令

有些命令需要 sudo 权限才能执行，但是我们不希望重复的输入密码，我们可以把每条命令修改为如下：

cmd ---> 'echo password | sudo -S cmd'

例如：

$ sshpass -p password ssh -o "StrictHostKeyChecking no" username@password "echo password | sudo -S mkdir /newdir"

对于如 echo, dd 等部分命令，有时会出现如下失败场景：

$ sshpass -p password ssh -o "StrictHostKeyChecking no" username@password 'echo password | sudo -S echo hello > /newdir/newfile'
bash: /newdir/newfile: 权限不够

解决办法如下：

cmd ---> 'echo password | sudo -S sh -c "cmd"'

# For example
$ sshpass -p password ssh -o "StrictHostKeyChecking no" username@password 'echo WSfdl097018= | sudo -S sh -c "echo hello > /newdir/newfile"'

如果采用 expect，需要把脚本拷贝到远程主机，然后在远程主机采用 sudo 执行该脚本，相对 sshpass 更简便和健壮：

...
# Copy script to remote host
spawn scp -o "StrictHostKeyChecking no" shell_script.sh username@hostname:~/
expect "*assword*"
send "passwordn"
expect "*100%*"
expect eof

# Execute the shell script at remote host
spawn ssh -o "StrictHostKeyChecking no" username@hostname
expect "*assword*"
send "passwordn"
expect "*$*"
send "sudo sh shell_script.shn"
expect "*assword*"
send "passwordn"
......

总结

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