在Bash脚本中使用expect

Your Bash script is passing the Expect commands on the standard input of expect. That is what the here-document <<EOD does. However, expect... expects its commands to be provided in a file, or as the argument of a -c, per the man page. Three options are below. Caveat emptor; none have been tested.

1. Process substitution with here-document:

   expect <(cat <<'EOD'
   spawn ... (your script here)
   EOD
   )
   

   The EOD ends the here-document, and then the whole thing is wrapped in a <( ) process substitution block. The result is that expect will see a temporary filename including the contents of your here-document.

   As @Aserre noted, the quotes in <<'EOD' mean that everything in your here-document will be treated literally. Leave them off to expand Bash variables and the like inside the script, if that's what you want.

2. Edit Variable+here-document:

   IFS= read -r -d '' expect_commands <<'EOD'
   spawn ... (your script here)
   interact
   EOD
   
   expect -c "${expect_commands//
   /;}"
   

   Yes, that is a real newline after // - it's not obvious to me how to escape it. That turns newlines into semicolons, which the man page says is required.

   Thanks to this answer for the read+heredoc combo.

3. Shell variable

   expect_commands='
   spawn ... (your script here)
   interact'
   expect -c "${expect_commands//
   /;}"
   

   Note that any ' in the expect commands (e.g., after id_rsa) will need to be replaced with '\'' to leave the single-quote block, add a literal apostrophe, and then re-enter the single-quote block. The newline after // is the same as in the previous option.