1. Version A.01 H3064S Module 14 Slides
Scheduling cron Jobs
Version A.01
H3064S Module 14 Slides

2. The cron Daemon Executes commands at specified dates and times
Automates routine tasks
Examples:
Trimming system log files
Performing system backups
Generating weekly reports
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3. cronfile cronfile contains one line for each schedule job. Example:
# min
# 0-59
hour
0-23 * 6 5
date
1-31 *
1,15
month
1-12 *
day
0-6 *
1-5
command
must redirect output!
/usr/bin/date >/dev/console
>/var/adm/btmp
/usr/bin/who | /usr/bin/lp
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4. Managing cronfile with crontab
Edit and submit a cronfile:
crontab -e
View your cronfile:
crontab -l
Remove all your scheduled cron jobs:
crontab -r
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5. What Happens When a Job is Scheduled?
/var
spool
adm
cron
cron
crontabs
cron.allow
cron.deny
user1
user2
root
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