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Ero sivun ”Crontab/en” versioiden välillä
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(Ak: Uusi sivu: Crontab) |
(Ak: Uusi sivu: http://forum.ubuntu-fi.org/index.php?topic=8541 (Finnish)) |
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| (18 välissä olevaa versiota samalta käyttäjältä ei näytetä) | |||
| Rivi 1: | Rivi 1: | ||
<languages/> | <languages/> | ||
| − | Crontab | + | Crontab is a useful tool to schedule tasks in Linux. |
| − | == | + | == Scheduling == |
| − | + | Scheduling tasks with crontab is pretty simple: | |
| − | * * * * * | + | * * * * * command to be run |
┬ ┬ ┬ ┬ ┬ | ┬ ┬ ┬ ┬ ┬ | ||
│ │ │ │ │ | │ │ │ │ │ | ||
| − | │ │ │ │ └───── | + | │ │ │ │ └───── weekday (0 - 7) (0 or 7 = sunday) |
| − | │ │ │ └────────── | + | │ │ │ └────────── month (1 - 12) |
| − | │ │ └─────────────── | + | │ │ └─────────────── day (1 - 31) |
| − | │ └──────────────────── | + | │ └──────────────────── hour (0 - 23) |
| − | └───────────────────────── | + | └───────────────────────── minute (0 - 59) |
| − | + | The crontab configuration file is | |
/etc/crontab | /etc/crontab | ||
| − | == | + | == Scheduling examples == |
| − | + | Print something every minute | |
| − | */1 * * * * echo " | + | */1 * * * * echo "This prints every minute." |
| − | + | Print something every hour | |
| − | 0 1 * * * * root echo" | + | 0 1 * * * * root echo"This prints something every hour." |
| − | + | Run a sh script every hour | |
0 1 * * * * root sh /root/backup.sh | 0 1 * * * * root sh /root/backup.sh | ||
| − | + | Update dynamic DNS every Friday and Monday at 3:45 | |
45 3 * * 1,5 root curl -D - --user useraccount:password http://www.dy.fi/nic/update?hostname=hostname.dy.fi | 45 3 * * 1,5 root curl -D - --user useraccount:password http://www.dy.fi/nic/update?hostname=hostname.dy.fi | ||
| − | == | + | == Disable e-mail notifications == |
| − | + | Add the following line to the /etc/crontab file | |
MAILTO="" | MAILTO="" | ||
| − | == | + | == Related info == |
[[Backup]] | [[Backup]] | ||
| Rivi 51: | Rivi 51: | ||
[[Dynaaminen dns päivitys dy.fi]] | [[Dynaaminen dns päivitys dy.fi]] | ||
| − | == | + | == Sources == |
| − | http://linux.fi/wiki/Komentojen_ajastaminen | + | http://linux.fi/wiki/Komentojen_ajastaminen (Finnish) |
| − | http://forum.ubuntu-fi.org/index.php?topic=8541 | + | http://forum.ubuntu-fi.org/index.php?topic=8541 (Finnish) |
Nykyinen versio 12. elokuuta 2015 kello 10.00
Crontab is a useful tool to schedule tasks in Linux.
Sisällysluettelo
Scheduling
Scheduling tasks with crontab is pretty simple:
* * * * * command to be run ┬ ┬ ┬ ┬ ┬ │ │ │ │ │ │ │ │ │ └───── weekday (0 - 7) (0 or 7 = sunday) │ │ │ └────────── month (1 - 12) │ │ └─────────────── day (1 - 31) │ └──────────────────── hour (0 - 23) └───────────────────────── minute (0 - 59)
The crontab configuration file is
/etc/crontab
Scheduling examples
Print something every minute
*/1 * * * * echo "This prints every minute."
Print something every hour
0 1 * * * * root echo"This prints something every hour."
Run a sh script every hour
0 1 * * * * root sh /root/backup.sh
Update dynamic DNS every Friday and Monday at 3:45
45 3 * * 1,5 root curl -D - --user useraccount:password http://www.dy.fi/nic/update?hostname=hostname.dy.fi
Disable e-mail notifications
Add the following line to the /etc/crontab file
MAILTO=""
Related info
Sources
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