How does anacron work if it's not a daemon?
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I was reading about the differences between cron and anacron and I realized that anacron, unlike cron is not a daemon. So I'm wondering how does it work actually if it's not a daemon.
cron background-process anacron
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
asked Dec 15 '17 at 12:52
tgwtdt
36019
add a comment |Â
up vote
12
down vote
favorite
I was reading about the differences between cron and anacron and I realized that anacron, unlike cron is not a daemon. So I'm wondering how does it work actually if it's not a daemon.
cron background-process anacron
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
asked Dec 15 '17 at 12:52
tgwtdt
36019
add a comment |Â
up vote
12
down vote
favorite
up vote
12
down vote
favorite
I was reading about the differences between cron and anacron and I realized that anacron, unlike cron is not a daemon. So I'm wondering how does it work actually if it's not a daemon.
cron background-process anacron
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
asked Dec 15 '17 at 12:52
tgwtdt
36019
I was reading about the differences between cron and anacron and I realized that anacron, unlike cron is not a daemon. So I'm wondering how does it work actually if it's not a daemon.
cron background-process anacron
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
asked Dec 15 '17 at 12:52
tgwtdt
36019
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
edited Dec 15 '17 at 17:21
Stephen Kitt
143k22309372
143k22309372
asked Dec 15 '17 at 12:52
tgwtdt
36019
asked Dec 15 '17 at 12:52
tgwtdt
36019
asked Dec 15 '17 at 12:52
tgwtdt
36019
36019
add a comment |Â
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
17
down vote
accepted
It uses a variety of methods to run:
- if the system is running systemd, it uses a systemd timer (in the Debian package, you’ll see it in
/lib/systemd/system/anacron.timer); - if the system isn’t running systemd, it uses a system cron job (in
/etc/cron.d/anacron); - in all cases it runs daily, weekly and monthly cron jobs (in
/etc/cron.daily,weekly,monthly/0anacron); - it also runs at boot (from
/etc/init.d/anacronor its systemd unit).
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
I've seen thea,b,cnotation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the...replaced with any of the comma-separated things?
– Nic Hartley
Dec 15 '17 at 22:11
3
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
add a comment |Â
up vote
5
down vote
anacron is not a daemon, and therefore it needs to be run periodically by other means. Most often, this means executing it with a cron job once a day, and possibly on bootup as well.
This may look like the following in root's crontab, for example:
@reboot /usr/local/sbin/anacron -ds
@daily /usr/local/sbin/anacron -ds
Linux systems that uses systemd may do this differently, obviously, but still need to facilitate at least one run of anacron per 24 hour period.
Running anacron more than once every 24 hours is pointless as the shortest period one can schedule jobs through anacron is once a day.
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
17
down vote
accepted
It uses a variety of methods to run:
- if the system is running systemd, it uses a systemd timer (in the Debian package, you’ll see it in
/lib/systemd/system/anacron.timer); - if the system isn’t running systemd, it uses a system cron job (in
/etc/cron.d/anacron); - in all cases it runs daily, weekly and monthly cron jobs (in
/etc/cron.daily,weekly,monthly/0anacron); - it also runs at boot (from
/etc/init.d/anacronor its systemd unit).
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
I've seen thea,b,cnotation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the...replaced with any of the comma-separated things?
– Nic Hartley
Dec 15 '17 at 22:11
3
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
add a comment |Â
up vote
17
down vote
accepted
It uses a variety of methods to run:
- if the system is running systemd, it uses a systemd timer (in the Debian package, you’ll see it in
/lib/systemd/system/anacron.timer); - if the system isn’t running systemd, it uses a system cron job (in
/etc/cron.d/anacron); - in all cases it runs daily, weekly and monthly cron jobs (in
/etc/cron.daily,weekly,monthly/0anacron); - it also runs at boot (from
/etc/init.d/anacronor its systemd unit).
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
I've seen thea,b,cnotation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the...replaced with any of the comma-separated things?
– Nic Hartley
Dec 15 '17 at 22:11
3
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
add a comment |Â
up vote
17
down vote
accepted
up vote
17
down vote
accepted
It uses a variety of methods to run:
- if the system is running systemd, it uses a systemd timer (in the Debian package, you’ll see it in
/lib/systemd/system/anacron.timer); - if the system isn’t running systemd, it uses a system cron job (in
/etc/cron.d/anacron); - in all cases it runs daily, weekly and monthly cron jobs (in
/etc/cron.daily,weekly,monthly/0anacron); - it also runs at boot (from
/etc/init.d/anacronor its systemd unit).
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
It uses a variety of methods to run:
- if the system is running systemd, it uses a systemd timer (in the Debian package, you’ll see it in
/lib/systemd/system/anacron.timer); - if the system isn’t running systemd, it uses a system cron job (in
/etc/cron.d/anacron); - in all cases it runs daily, weekly and monthly cron jobs (in
/etc/cron.daily,weekly,monthly/0anacron); - it also runs at boot (from
/etc/init.d/anacronor its systemd unit).
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
answered Dec 15 '17 at 13:00
Stephen Kitt
143k22309372
143k22309372
I've seen thea,b,cnotation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the...replaced with any of the comma-separated things?
– Nic Hartley
Dec 15 '17 at 22:11
3
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
add a comment |Â
I've seen thea,b,cnotation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the...replaced with any of the comma-separated things?
– Nic Hartley
Dec 15 '17 at 22:11
3
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
I've seen the
a,b,c notation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the ... replaced with any of the comma-separated things?– Nic Hartley
Dec 15 '17 at 22:11
I've seen the
a,b,c notation around; can I use that in my shell? (I don't have access to it right now or I'd test.) Does it mean what it seems to -- that is, all files with the ... replaced with any of the comma-separated things?– Nic Hartley
Dec 15 '17 at 22:11
3
3
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
@QPaysTaxes - Bash (and a few other shells) expands braces in that way - see Bash Reference Manual: Brace Expansion
– shalomb
Dec 15 '17 at 22:14
add a comment |Â
up vote
5
down vote
anacron is not a daemon, and therefore it needs to be run periodically by other means. Most often, this means executing it with a cron job once a day, and possibly on bootup as well.
This may look like the following in root's crontab, for example:
@reboot /usr/local/sbin/anacron -ds
@daily /usr/local/sbin/anacron -ds
Linux systems that uses systemd may do this differently, obviously, but still need to facilitate at least one run of anacron per 24 hour period.
Running anacron more than once every 24 hours is pointless as the shortest period one can schedule jobs through anacron is once a day.
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
add a comment |Â
up vote
5
down vote
anacron is not a daemon, and therefore it needs to be run periodically by other means. Most often, this means executing it with a cron job once a day, and possibly on bootup as well.
This may look like the following in root's crontab, for example:
@reboot /usr/local/sbin/anacron -ds
@daily /usr/local/sbin/anacron -ds
Linux systems that uses systemd may do this differently, obviously, but still need to facilitate at least one run of anacron per 24 hour period.
Running anacron more than once every 24 hours is pointless as the shortest period one can schedule jobs through anacron is once a day.
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
add a comment |Â
up vote
5
down vote
up vote
5
down vote
anacron is not a daemon, and therefore it needs to be run periodically by other means. Most often, this means executing it with a cron job once a day, and possibly on bootup as well.
This may look like the following in root's crontab, for example:
@reboot /usr/local/sbin/anacron -ds
@daily /usr/local/sbin/anacron -ds
Linux systems that uses systemd may do this differently, obviously, but still need to facilitate at least one run of anacron per 24 hour period.
Running anacron more than once every 24 hours is pointless as the shortest period one can schedule jobs through anacron is once a day.
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
anacron is not a daemon, and therefore it needs to be run periodically by other means. Most often, this means executing it with a cron job once a day, and possibly on bootup as well.
This may look like the following in root's crontab, for example:
@reboot /usr/local/sbin/anacron -ds
@daily /usr/local/sbin/anacron -ds
Linux systems that uses systemd may do this differently, obviously, but still need to facilitate at least one run of anacron per 24 hour period.
Running anacron more than once every 24 hours is pointless as the shortest period one can schedule jobs through anacron is once a day.
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
edited Mar 8 at 19:02
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
answered Dec 15 '17 at 13:19
Kusalananda
104k14206324
104k14206324
add a comment |Â
add a comment |Â
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