How SSH Environment Variables works with shell script file?

Question

If I run the command bellow and my install.sh has the following section:

export S3_URL=$PRD_URL
export S3_ACCESS_KEY=$PRD_S3_ACCESS_KEY
export S3_SECRET_KEY=$PRD_S3_SECRET_KEY

cat install.sh | ssh $PRD_USER@$PRD_HOST

The $PRD_S3_ACCESS_KEY is going to be resolved from my host or the environment variables from the remote server?

Remote. Cat'ting doesn't evaluate the variables in the file. — tink
– tink, Commented Feb 16, 2020 at 20:45
If you rephrase your question above so it matches the comment @philippe's answer below does what you want ;) — tink
– tink, Commented Feb 16, 2020 at 22:29

Philippe · Accepted Answer · 2020-02-16 22:05:47Z

2

Assuming you have gettext installed (which contains envsubst), you can do

envsubst < install.sh | ssh $PRD_USER@$PRD_HOST

answered Feb 16, 2020 at 21:12

Philippe

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