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lang-bash
MYNEWVARIABLE=Ubuntuand executeprintenvit doesn't show there. Why is that, and how do those others show up?export MYNEWVARIABLE=Ubuntuand it will work as you expect.set, it lists the variable created by you as well. Or doset | grep myvarprintenvis an external command, so it only knows about (and prints) exported environment variables.setis an internal bash command, so it shows all the "shell variables" (unexported environment variables) as well as the exported environment variables.unset MYNEWVARIABLE; MYNEWVARIABLE=Ubuntu; printenv | grep MYNEW, but this willunset MYNEWVARIABLE; export MYNEWVARIABLE=Ubuntu; printenv | grep MYNEW, and this willunset MYNEWVARIABLE; MYNEWVARIABLE=Ubuntu printenv | grep MYNEW. Using export says "the variable I'm setting should be part of the environment that gets passed to processes, not just a variable in this shell." My third example says "the variable should be part of the environment that gets passed to THIS process, but not stick around afterward."