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How to "inject" lines into a redirect here doc?

I have a BASH function execute

that establishes a SSH connection to a machine and runs a bunch of commands provided here by redirecting the doc. This works great. Is there a way to insert some commands into the redirect? I would like to always run prepare_something

before eg do_something

.

function execute() {
    ssh user@host /bin/bash
}

execute << EOF
    do_something
EOF
+3


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1 answer


You can use a subshell to combine echo with cat

that consumes stdin functions. Then the subshell output will become the input of your ssh command.



function execute() {
    ( echo prepare_something ; cat ) | ssh user@host /bin/bash
}
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