Pipe command output inside other command

Question

I'm trying to pipe the output of the first command into the quotation marks at the end of the second command.

kubectl --context foo -n foo get secret postgres.foo-db.credentials -o jsonpath={.data.password}

---

kubectl --context foo -n foo patch secret postgres.foo-db.credentials -p '{"data":{"password":"    Output from command 1    "}}'

I've already tried this: piping output into middle of bash command, but I get the following error with this command:

kubectl --context foo -n foo patch secret postgres.foo-db.credentials -p '{"data":{"`password":"kubectl --context foo -n foo get secret postgres.foo-db.credentials -o jsonpath={.data.password}`"}}'

---

The request is invalid: patch: Invalid value: "map[data:map[`password:kubectl --context foo  -n foo  get secret postgres.foo-db.credentials -o jsonpath={.data.password}`]]": error decoding from json: illegal base64 data at input byte 7

Answer 1

You can split the command in two to make it easier to understand and let the bash shell expand the variable pgsecret in the second line:

pgsecret="$(kubectl --context foo -n foo get secret \
  postgres.foo-db.credentials -o jsonpath={.data.password})"
kubectl \
  --context foo -n foo patch secret \
  postgres.foo-db.credentials -p '{"data":{"password":"'$pgsecret'"}}'