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Crontabs (view source)

Revision as of 14:06, 19 April 2018

2 bytes removed ,  14:06, 19 April 2018
→‎Crontab syntax and editing overview
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For the sake of example, I've added a Ping Reboot rule to the router's configuration. In the figure above you can see that creating such a rule also generates an entry (encapsulated in green) in the crontab list. Let's examine this entry:
 
For the sake of example, I've added a Ping Reboot rule to the router's configuration. In the figure above you can see that creating such a rule also generates an entry (encapsulated in green) in the crontab list. Let's examine this entry:
   −
* The '''/sbin/ping_reboot 1 8.8.8.8 NULL 2 56 5 1 0 cfg02c21d''' part indicates the action that is to be taken. In this case it is the ''/sbin/ping_reboot'' command with the options ''1 8.8.8.8 NULL 2 56 5 1 0 cfg02c21d'' that go with it
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* The '''/sbin/ping_reboot 1 8.8.8.8 NULL 2 56 5 1 0 cfg02c21d''' part indicates the action that is to be taken. In this case it is the ''/sbin/ping_reboot'' command with the options ''1 8.8.8.8 NULL 2 56 5 1 0 cfg02c21d''
 
* The '''*/5 * * * *''' part indicates the frequency at which the action is executed. It consists out of five segments: '''minute''', '''hour''', '''day of month''', '''month''' and '''day of week''' in that order. A table of examples on how to specify this frequency is presented below:
 
* The '''*/5 * * * *''' part indicates the frequency at which the action is executed. It consists out of five segments: '''minute''', '''hour''', '''day of month''', '''month''' and '''day of week''' in that order. A table of examples on how to specify this frequency is presented below:
    
{| class="wikitable"
 
{| class="wikitable"
 
|+
 
|+
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! style="width: 130px; text-align: left;" | Segment
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! style="width: 130px; text-align: left;" | Segment
 
| style="width: 100px; text-align: center; | '''minute'''
 
| style="width: 100px; text-align: center; | '''minute'''
 
| style="width: 100px; text-align: center; | '''hour'''
 
| style="width: 100px; text-align: center; | '''hour'''
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| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
−
| style="text-align: left; vertical-align: top;" | every 5 minutes
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| style="text-align: left; vertical-align: top;"   | every 5 minutes
 
|-
 
|-
 
| style="text-align: center; vertical-align: top;" | 12
 
| style="text-align: center; vertical-align: top;" | 12
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| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
−
| style="text-align: left; vertical-align: top;" | every 3 hours at 12 minutes
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| style="text-align: left; vertical-align: top;"   | every 3 hours at 12 minutes
 
|-
 
|-
 
| style="text-align: center; vertical-align: top;" | 57
 
| style="text-align: center; vertical-align: top;" | 57
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| style="text-align: center; vertical-align: top;" | 1/6/12
 
| style="text-align: center; vertical-align: top;" | 1/6/12
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
−
| style="text-align: left; vertical-align: top;" | At 11:57 Hrs on 15th of Jan, June & Dec.
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| style="text-align: left; vertical-align: top;"   | At 11:57 Hrs on 15th of Jan, June & Dec.
 
|-
 
|-
 
| style="text-align: center; vertical-align: top;" | 25
 
| style="text-align: center; vertical-align: top;" | 25
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| style="text-align: center; vertical-align: top;" | 1
 
| style="text-align: center; vertical-align: top;" | 1
 
| style="text-align: center; vertical-align: top;" | 5
 
| style="text-align: center; vertical-align: top;" | 5
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| style="text-align: left; vertical-align: top;" | At 6:25 AM every weekday (Mon-Fri)
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| style="text-align: left; vertical-align: top;"   | At 6:25 AM every weekday (Mon-Fri)
 
|-
 
|-
 
| style="text-align: center; vertical-align: top;" | 0
 
| style="text-align: center; vertical-align: top;" | 0
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| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
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| style="text-align: left; vertical-align: top;" | At midnight on 4th, 12th and 26th of every month
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| style="text-align: left; vertical-align: top;"   | At midnight on 4th, 12th and 26th of every month
 
|-
 
|-
 
| style="text-align: center; vertical-align: top;" | 5.10
 
| style="text-align: center; vertical-align: top;" | 5.10
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| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | *
 
| style="text-align: center; vertical-align: top;" | 0,4
 
| style="text-align: center; vertical-align: top;" | 0,4
−
| style="text-align: left; vertical-align: top;" | At 9:05AM, 9:10AM, 2:05PM and 2:10PM every Sunday and Thursday
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| style="text-align: left; vertical-align: top;"   | At 9:05AM, 9:10AM, 2:05PM and 2:10PM every Sunday and Thursday
 
|-
 
|-
 
|}
 
|}
 +
 
==External links==
 
==External links==
    
https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html - PuTTY downloads page link
 
https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html - PuTTY downloads page link
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