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  • Hmmm, if I have to make a modification like this to crontab, I might as well just create a file called ~/.zshrc-java since I have a lot of dotfiles, organized by functionality (~/.zshrc-git, ~/.zshrc-p4, ~/.zshrc-work, ~/.zshrc-home). Commented Mar 23, 2021 at 22:01
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    ... or add JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre/ at the top of your crontab, instead of setting it for each job. The point of this answer is to avoid duplicating the definition of a variable (since you asked about "sharing") and, given that there is no profile/initialization file that both sh and zsh read by default, a clean way to do that is by letting zsh define the environment for the cron job. Commented Mar 23, 2021 at 22:10
  • I didn't realize you could do that. That's the simplest solution, though I need to use that sparingly. Self-contained single lines are easier to debug. Commented Mar 23, 2021 at 22:44
  • I'll mark this answer correct though I'll just add an extra line to your answer. Hope you don't mind. Commented Mar 23, 2021 at 22:45
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    I removed the numbered list to make clear that the three paragraphs correspond to three distinct solutions. I'd guess the "best" approach is ultimately a matter of taste. Commented Mar 23, 2021 at 22:56