Learn about Centmin Mod LEMP Stack today
Register Now

Crontab first value

Discussion in 'System Administration' started by pamamolf, Nov 9, 2014.

  1. pamamolf

    pamamolf Premium Member Premium Member

    3,861
    379
    83
    May 31, 2014
    Ratings:
    +731
    Local Time:
    6:42 PM
    Nginx-1.17.x
    MariaDB 10.3.x
    Hi

    On crontab i know that the first value (*) is minutes and it can be set from 0-59

    But i don't know what it does if used as:

    1) */1
    2) /1

    Can you please let me know what it will do in case 1 and what in case 2 ?

    Thank you !
     
  2. rdan

    rdan Well-Known Member

    4,993
    1,191
    113
    May 25, 2014
    Ratings:
    +1,813
    Local Time:
    12:42 AM
    Mainline
    10.2
  3. pamamolf

    pamamolf Premium Member Premium Member

    3,861
    379
    83
    May 31, 2014
    Ratings:
    +731
    Local Time:
    6:42 PM
    Nginx-1.17.x
    MariaDB 10.3.x
    Thanks for the link RoldanLT :)

    But i just want to know for those two scenarios only :)
     
  4. eva2000

    eva2000 Administrator Staff Member

    45,468
    10,319
    113
    May 24, 2014
    Brisbane, Australia
    Ratings:
    +16,005
    Local Time:
    2:42 AM
    Nginx 1.19.x
    MariaDB 5.5/10.x
    read crontab(5): tables for driving cron - Linux man page and CronChecker

    quick google 35.1.1. Configuring Cron Tasks

     
  5. pamamolf

    pamamolf Premium Member Premium Member

    3,861
    379
    83
    May 31, 2014
    Ratings:
    +731
    Local Time:
    6:42 PM
    Nginx-1.17.x
    MariaDB 10.3.x
    Thanks George so if i add in the first value in minutes this:

    */1

    It will run every minute or every fist minute of the hour?
     
  6. eva2000

    eva2000 Administrator Staff Member

    45,468
    10,319
    113
    May 24, 2014
    Brisbane, Australia
    Ratings:
    +16,005
    Local Time:
    2:42 AM
    Nginx 1.19.x
    MariaDB 5.5/10.x
    * = */1 both the same for minutes
     
  7. pamamolf

    pamamolf Premium Member Premium Member

    3,861
    379
    83
    May 31, 2014
    Ratings:
    +731
    Local Time:
    6:42 PM
    Nginx-1.17.x
    MariaDB 10.3.x
    yes ok both are the same but does this run every minute?
     
  8. eva2000

    eva2000 Administrator Staff Member

    45,468
    10,319
    113
    May 24, 2014
    Brisbane, Australia
    Ratings:
    +16,005
    Local Time:
    2:42 AM
    Nginx 1.19.x
    MariaDB 5.5/10.x
    read the linked manual/info as to what * means ;)
     
  9. pamamolf

    pamamolf Premium Member Premium Member

    3,861
    379
    83
    May 31, 2014
    Ratings:
    +731
    Local Time:
    6:42 PM
    Nginx-1.17.x
    MariaDB 10.3.x
    Ok got it thanks :)