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I believe you have a namespace problem.

You define a docker() function that does all strange things.

Then inside docker() you call $(docker network ls), that just calls the same function recursively, or inside status you call $(docker ps -aq | wc -l).

There is only one namespace - after you define a function named docker docker() {} anywhere you call $(docker) it will call that function.

You can use command, ex. echo() { printf "I AM NOT ECHO\n"; }; echo 123; command echo 123 - the first echo 123 will execute the function if it exists, the second one will however try to find echo executable in PATH and execute it.

However I better suggest to just use a unique namespace that will not interfere with anything. Declaring your functions docker hides the real command.