How unset a lot of environment variables

Question

Have any way to unset different variables using a one command?

unset HTTP_PROXY
unset HTTPS_PROXY
unset FTP_PROXY
unset ALL_PROXY
unset NO_PROXY

Solution 1

unset takes multiple variables:

unset HTTP_PROXY HTTPS_PROXY FTP_PROXY ALL_PROXY NO_PROXY

Solution 2

A little bit late, but anyway. Depending on your variable pattern you can shorten your unset:

1. List your variables. For example, depending on your scope you can do it with env or compgen -v.
2. Filter for desired variables. For example with grep or sed.
3. Pass the variables to unset.

For example in your case it can be:

unset $(compgen -v | grep "_PROXY$")

It's not exactly one command, but it imitates unset *_PROXY, as you requested in your comment.

Solution 3

Using babashka:

bb -o '(->> (System/getenv)
            keys
            (filter #(str/ends-with? % "_PROXY"))
            (map #(str "unset " %)))' | 
  source /dev/stdin

Comments

[Bruno Wego]

It should be the only way. Thanks!

[Rufus]

For some reason, this does not work if the variables you want to unset is stored in a variable itself, e.g. unset "$UNSET_VARS" does not work..

[that other guy]

That passes them all as a single parameter. You need each variable as a separate argument, e.g. by not quoting it, or preferably by using an array in the first place