bashshellsshdash-shell

dash script, send yes for a command

I want to call a command with a script using dash. here is my code:

#!/bin/sh
ip='172.45.0.219'
cmd1='yes yes'
cmd2="./ssh foo@$ip"
eval $cmd1 | $cmd2

when I run my script this is my output:

Pseudo-terminal will not be allocated because stdin is not a terminal.
The authenticity of host '172.45.0.219 (172.45.0.219)' can't be established.
ECDSA key fingerprint is SHA256:PpEShWXU3zQhkyAsy4Zd1Jddb2lW0ULautIdPMr8yxA.
Are you sure you want to continue connecting (yes/no)?

and waiting for a 'yes/no'. I want this script get 'yes' automatically.

I try some other ways like this:

eval echo yes | $cmd2

and get the same result. Thanks for any help.

Solution

  • In this case, the user must be authenticated and the solution is:

    #!/bin/sh
ip='172.45.0.219'
cmd="ssh-keyscan -H $ip >> ~/.ssh/known_hosts"
eval $cmd

    However, this is not the real answer of this question.