将局部变量传递给远程shell bash脚本

Question

Trying to pass local variable to remote shell using bash script. Here is what I am trying. This is test.sh

#!/bin/bash

envi=$1

function samplefunction {
                        echo "Environment selected is $envi"
                        }

if [ "$envi" = "test" ]; then
   ssh user@remotehost <<EOF
   $(typeset -f samplefunction)
   samplefunction
EOF

else
 echo "Please pass correct parameter which is - test"
fi

When I try to execute "./test.sh test" the result I am getting is "Environment selected is". shell is not able to pass the variable to the remote system.

Answer 1

ssh does not (and can't) make such variables available on the remote side.

You can instead embed the definition just like you embedded your function:

ssh user@remotehost <<EOF
   $(declare -p envi)
   $(typeset -f samplefunction)
   samplefunction
EOF

You can also copy all known variables. In that case it helps to squash the errors about setting read-only values:

ssh user@remotehost <<EOF
   {
     $(declare -p)
   } 2> /dev/null
   $(typeset -f samplefunction)
   samplefunction
EOF

If you have a specific variable you frequently want to copy, you can choose to have ssh send it automatically by adding SendEnv envi to your ssh config. The variable must be exported for this to work.