What does * * * * * (five asterisks) in a cron file mean? [duplicate]

Every minute of every day of every week of every month, that command runs.

man 5 crontab has the documentation of this. If you just type man crontab, you get the documentation for the crontab command. What you want is section 5 of the manual pages which covers system configuration files including the /etc/crontab file. For future reference, the sections are described in man man:

   1   Executable programs or shell commands
   2   System calls (functions provided by the kernel)
   3   Library calls (functions within program libraries)
   4   Special files (usually found in /dev)
   5   File formats and conventions eg /etc/passwd
   6   Games
   7   Miscellaneous  (including  macro  packages and conven‐
       tions), e.g. man(7), groff(7)
   8   System administration commands (usually only for root)
   9   Kernel routines [Non standard]

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