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https://issues.apache.org/jira/browse/MNG-7270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422074#comment-17422074
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Michael Osipov commented on MNG-7270:
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Indeed, {{which}} is not a shell builtin.
> maven shell script wrapper (init) calls "which", which might not be installed
> -----------------------------------------------------------------------------
>
> Key: MNG-7270
> URL: https://issues.apache.org/jira/browse/MNG-7270
> Project: Maven
> Issue Type: Bug
> Components: Command Line
> Affects Versions: 3.8.2
> Environment: UNIX/POSIX, Linux
> Reporter: Jonathan Dowland
> Priority: Minor
>
> The "init" shell wrapper script, that often ends up as /usr/bin/mvn in
> downstream distributions, calls the program "which" in the situation where
> JAVA_HOME is not defined.
> "which" is a separate binary program that may or may not be installed.
> Increasingly it may not be in environments which are trying to reduce their
> install footprint e.g. containers.
> A portable alternative is to use `command -v` with some defensive commands
> prior (unalias, unset: see
> [https://pubs.opengroup.org/onlinepubs/009695399/utilities/command.html).]--
> I've got a PR ready to go.
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