Crontab

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- weekday (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  *  user command to be executed
10 * * * * /bin/sh backup.sh    # every hour at 10"

Cron crontab

# Adding tasks easily
echo "@reboot echo hi" | crontab

# Open in editor
crontab -e

# List tasks
crontab -l [-u user]

Source: devhints.io

*/1 in crontab

*/1 means exactly the same as *

Crontab

*/15 * * * * YOUR COMMAND >/dev/null 2>&1

*/5 in crontab

*/5 * * * *  means Execute a cron job every 5 minutes

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