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    UNIX Scheduling with cron

    IT Discussion
    linux unix sam linux administration cron cron job crontab bsd solaris
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    • JaredBusch
      JaredBusch last edited by

      Thanks,
      I always have to look this up again because i never do it often enough to have ti 100% in memory.

      scottalanmiller 1 Reply Last reply Reply Quote 1
      • scottalanmiller
        scottalanmiller @JaredBusch last edited by

        @JaredBusch said in UNIX Scheduling with cron:

        Thanks,
        I always have to look this up again because i never do it often enough to have ti 100% in memory.

        Definitely check it out and let me know if anything is unclear or missing. Cron is always just a little confusing and I wanted to balance making it easy but having the needed info.

        1 Reply Last reply Reply Quote 0
        • JaredBusch
          JaredBusch @scottalanmiller last edited by JaredBusch

          @scottalanmiller said in UNIX Scheduling with cron:

          The fields can be in these forms:

          • Single Number: 5
          • List of Numbers: 0,15,30,45
          • Range of Numbers: 1-5
          • All: *

          From memory here, not bothering to check Google at the moment, but can you not also mix a list and range?

          0,8-17,22
          

          So that would send at midnight, and every hour 8-17 and then 22?

          scottalanmiller 1 Reply Last reply Reply Quote 2
          • stacksofplates
            stacksofplates last edited by

            Just to point out, there are some other strings you can use also.

            @yearly
            @weekly
            @daily
            

            You can also use /

            0-30/5 * * * *
            

            Is every 5 minutes for the first 30 minutes.

            coliver 1 Reply Last reply Reply Quote 2
            • scottalanmiller
              scottalanmiller @JaredBusch last edited by

              @JaredBusch said in UNIX Scheduling with cron:

              @scottalanmiller said in UNIX Scheduling with cron:

              The fields can be in these forms:

              • Single Number: 5
              • List of Numbers: 0,15,30,45
              • Range of Numbers: 1-5
              • All: *

              From memory here, not bothering to check Google at the moment, but can you not also mix a list and range?

              0,8-17,22
              

              So that would send at midnight, and every hour 8-17 and then 22?

              Yes, I'm pretty sure that that is correct.

              1 Reply Last reply Reply Quote 0
              • tonyshowoff
                tonyshowoff last edited by

                I've been dealing with cron for... 22 years I guess, and it still irritates the hell out of me. Anyway, great work.

                scottalanmiller 1 Reply Last reply Reply Quote 2
                • coliver
                  coliver @stacksofplates last edited by

                  @johnhooks said in UNIX Scheduling with cron:

                  Just to point out, there are some other strings you can use also.

                  @yearly
                  @weekly
                  @daily
                  

                  You can also use /

                  0-30/5 * * * *
                  

                  Is every 5 minutes for the first 30 minutes.

                  I didn't know about the '/' That's really good to know.

                  scottalanmiller 1 Reply Last reply Reply Quote 1
                  • scottalanmiller
                    scottalanmiller @tonyshowoff last edited by

                    @tonyshowoff said in UNIX Scheduling with cron:

                    I've been dealing with cron for... 22 years I guess, and it still irritates the hell out of me. Anyway, great work.

                    Thanks.

                    1 Reply Last reply Reply Quote 0
                    • scottalanmiller
                      scottalanmiller @coliver last edited by

                      @coliver said in UNIX Scheduling with cron:

                      I didn't know about the '/' That's really good to know.

                      I tacked it on in the advanced section at the end. This one I've seen used in real life. Never seen anyone use @monthly, for example. I know that it exists, but just have never seen it get used.

                      tonyshowoff 1 Reply Last reply Reply Quote 0
                      • tonyshowoff
                        tonyshowoff @scottalanmiller last edited by

                        @scottalanmiller said in UNIX Scheduling with cron:

                        @coliver said in UNIX Scheduling with cron:

                        I didn't know about the '/' That's really good to know.

                        I tacked it on in the advanced section at the end. This one I've seen used in real life. Never seen anyone use @monthly, for example. I know that it exists, but just have never seen it get used.

                        I do, for expiring old user sessions.

                        1 Reply Last reply Reply Quote 1
                        • travisdh1
                          travisdh1 last edited by

                          I was going to say that it's another handy reference to the time formatting for cron, but I normally just use the man page.

                          1 Reply Last reply Reply Quote 0
                          • A
                            Alex Sage last edited by Alex Sage

                            6:03 AM

                            03 6 * * * <command>

                            or

                            3 6 * * * <command>

                            ???

                            JaredBusch 1 Reply Last reply Reply Quote 0
                            • JaredBusch
                              JaredBusch @Alex Sage last edited by

                              @aaronstuder said in UNIX Scheduling with cron:

                              6:03 AM

                              03 6 * * * <command>

                              or

                              3 6 * * * <command>

                              ???

                              The latter.

                              1 Reply Last reply Reply Quote 1
                              • A
                                Alex Sage last edited by

                                Thanks!

                                1 Reply Last reply Reply Quote 0
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