Crontab Day of the Week syntax

Question

In crontab does the Day of the Week field run from 0 - 6 or 1 -7   I am seeing conflicting information on this   wikipedia states 0-6 and other sites I have seen are 1-7   Also what would be the implication or either using 0 or 7 incorrectly   i e  would the cron still run

User · Answer

You can also use day names like Mon for Monday  Tue for Tuesday  etc  It s more human friendly

User · Answer

-  Sunday         0  - gt   Sun                               Monday         1  - gt   Mon        Tuesday         2  - gt   Tue      Wednesday         3  - gt   Wed       Thursday         4  - gt   Thu         Friday         5  - gt   Fri       Saturday         6  - gt   Sat                            -  Sunday         7  - gt   Sun   As you can see above  and as said before  the numbers 0 and 7 are both assigned to Sunday  There are also the English abbreviated days of the week listed  which can also be used in the crontab   Examples of Number or Abbreviation Use  15 09     5 6 0             command 15 09     5 6 7             command 15 09     5-7               command 15 09     Fri Sat Sun       command   The four examples do all the same and execute a command every Friday  Saturday  and Sunday at 9 15 o clock   In Detail  Having two numbers 0 and 7 for Sunday can be useful for writing weekday ranges starting with 0 or ending with 7  So you can write ranges starting with Sunday or ending with it  like 0-2 or 5-7 for example  ranges must start with the lower number and must end with the higher   The abbreviations cannot be used to define a weekday range

User · Answer

0 and 7 both stand for Sunday  you can use the one you want  so writing 0-6 or 1-7 has the same result   Also  as suggested by  Henrik  it is possible to replace numbers by shortened name of days  such as MON  THU  etc   0 - Sun      Sunday 1 - Mon      Monday 2 - Tue      Tuesday 3 - Wed      Wednesday 4 - Thu      Thursday 5 - Fri      Friday 6 - Sat      Saturday 7 - Sun      Sunday   Graphically     ---------- minute  0 - 59       -------- hour  0 - 23          ------ day of month  1 - 31             ---- month  1 - 12                -- day of week  0 - 6   gt  Sunday - Saturday  or                                1 - 7   gt  Monday - Sunday                        command to be executed   Finally  if you want to specify day by day  you can separate days with commas  for example SUN MON THU will exectute the command only on sundays  mondays on thursdays   You can read further details in Wikipedia s article about Cron

[linux] Crontab Day of the Week syntax

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