Last Day of Month Cron

Example:

0 0 * * * [ $(date -d tomorrow +\%d) -eq 1 ] && /script.sh

Cron has no native "last day of month" syntax. Use a script wrapper that checks: [ $(date -d tomorrow +%d) -eq 1 ] && /your/script.sh

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FAQs

Why no native last-day syntax?

Month lengths vary (28-31 days), so cron cannot hardcode it. Use a conditional check.