[SOLVED]Linux schedule example

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###12:08 PM 15/12/2014##
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#* * * * * <script>
#| | | | |    \-Scrip duoc su dung khi cron kich hoat
#| | | | \Ngay trong tuan: 0-6: 1-T2 | 2-T3 | 3-T4 | 4-T5 | 5-T6 | 6-T7 | 0-CN
#| | | \Thang trong nam: 1-12 : 1-Jan | 2-Feb | 3-Mar | 4-Apr | 5-May | 6-Jun | 7-Jul | 8-Aug | 9-Sep | 10-Oct | 11-Nov | 12-Dec
#| | \Ngay trong thang: 1-31
#| \Gio trong ngay: 0-23
#\Phut trong gio: 0-59
#Script nay duoc day vao "crontab -e"##########################################################
#*     *     *   *    *        command to be executed
#-     -     -   -    -
#|     |     |   |    |
#|     |     |   |    +----- day of week (0 - 6) (Sunday=0)
#|     |     |   +------- month (1 - 12)
#|     |     +--------- day of        month (1 - 31)
#|     +----------- hour (0 - 23)
#+------------- min (0 - 59)
##########################################################
#Starting backup daily, at 2h15
15 2 * * * /opt/script/bk-script-gluster-storage

#Every 1 mins:
* * * * * CMD

#Every 5 mins:
*/5 * * * * /home/ramesh/backup.sh

#Every 5 hours:
0 */5 * * * /home/ramesh/backup.sh

#Every 5 secs:
Create a shell script every-5-seconds.sh using bash while loop as shown below.$ cat every-5-seconds.sh
    #!/bin/bash
    while true
    do
     /home/ramesh/backup.sh
     sleep 5
    done
  
#Every 1 sec:
* * * * * dostuff.sh
#dostuff.sh:begin
    i=0
    while [ $i -lt 60 ]; do
      /opt/script/get-date-1s &
      sleep 1
      i=$(( i + 1 ))
    done
#dostuff.sh:end

#Ex:
#####Scheduling a job for a specific time:
30 08 10 06 * /home/ramesh/full-backup
30: 30th minute
08: 08 AM
10: 10th day
06: 6th month (June)
* : Every day of week

#####Schedule a Job For More Than One Instance (e.g. Twice a Day):
00 11,16 * * * /home/ramesh/bin/incremental-backup
This example executes the specified incremental backup shell script (incremental-backup) at 11:00 and 16:00 on every day.
The comma separated value in a field specifies that the command needs to be executed in all the mentioned time.

#####Schedule a Job for Specific Range of Time (e.g. Only on Weekdays):
########Cron Job everyday during working hours:
00 09-18 * * * /home/ramesh/bin/check-db-status
This example checks the status of the database everyday (including weekends) during the working hours 9 a.m – 6 p.m
00        : 0th Minute (Top of the hour)
09-18    : 9 am, 10 am, 11 am, 12 am, 1 pm, 2 pm, 3 pm, 4 pm, 5 pm, 6 pm
*        : Every day
*        : Every month
*        : Every day of the week

#####Cron Job every weekday during working hours
00 09-18 * * 1-5 /home/ramesh/bin/check-db-status
This example checks the status of the database every weekday (i.e excluding Sat and Sun) during the working hours 9 a.m – 6 p.m.
00        : 0th Minute (Top of the hour)
09-18    : 9 am, 10 am,11 am, 12 am, 1 pm, 2 pm, 3 pm, 4 pm, 5 pm, 6 pm
*        : Every day
*        : Every month
1-5        : Mon, Tue, Wed, Thu and Fri (Every Weekday)
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View Current Logged-In User’s Crontab entries
To view your crontab entries type crontab -l from your unix account as shown below.

ramesh@dev-db$ crontab -l
@yearly /home/ramesh/annual-maintenance
*/10 * * * * /home/ramesh/check-disk-space
[Note: This displays crontab of the current logged in user]

#####Edit Root Crontab entries:
root@dev-db# crontab -e

#####Edit Other Linux User’s Crontab File entries
root@dev-db# crontab -u sathiya -e