Here are some examples:
Example1: You want to run job on even/odd minute:
0-59/2 * * * * /path/to/evenjob.sh
1-59/2 * * * * /path/to/oddjob.sh
Example2: You want to run job in 10th minutie of every even/odd hour:
10 0-23/2 * * * /path/to/evenjob.sh
10 1-23/2 * * * /path/to/oddjob.sh
Example3: You want to run job at 5pm every even/odd date
0 17 2-31/2 * * /path/to/evenjob.sh
0 17 1-31/2 * * /path/to/oddjob.sh
If you dont clearly remember the positions of the minutes/hours/days you can find them in this man page:
man 5 crontab
here is a snippet from it:
| field | allowed values |
| minute | 0-59 |
| hour | 0-23 |
| day of month | 1-31 |
| month | 1-12 (or names, see below) |
| day of week | 0-7 (0 or 7 is Sun, or use names) |
