5-4 Schedule Tasks Using at and cron

Question 1

at

Answer 1

Execute command at a later time

Question 2

/etc/at.allow

Answer 2

Configure users permitted to use at command

Question 3

/etc/at.deny

Answer 3

Configure users not permitted to use at command
» Accepts following time/date formats:
- hh:mm
- midnight
- noon
- teatime (16:00)
- am/pm
- Full dates
- now + time

Question 4

atrm

Answer 4

Remove pending at task

Question 5

anacron

• f • Force execution, ignoring timestamps
• u • Upload timestamps of all jobs; does not run jobs
• n • Run jobs immediately, ignoring delays
• t • Use speci ed configuration file, instead of default
• h • Show help

Only root and superusers can use acacron

Answer 5

Execute commands periodically

Question 6

/etc/anacrontab

Answer 6

Configuration file

Question 7

/var/spool/anacron

Answer 7

Shows all timestamps for jobs