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update scheduled activity (cron and at)
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docs/help.md
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docs/help.md
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@ -190,8 +190,12 @@ to your .bashrc .
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to get your timezone you can use `date`.
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to get your timezone you can use `date`.
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## # cron/crontab
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## # scheduled activity
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with cron you can run specific tasks at a specific time.
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the linux utilities `cron` and `at` are related commands. you might use crontab, for example, to perform a task each morning at 2 a.m., and use at to remind yourself of an appointment later in the day.
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### cron/crontab
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the cron utility allows you to schedule a repetitive task to take place at any regular interval desired.<br />
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for more information see the manual pages of crontab(5) and cron(8)
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display current crontabs:<br />
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display current crontabs:<br />
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`crontab -l`
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`crontab -l`
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@ -202,11 +206,27 @@ add/edit crontabs:<br />
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example: - backup your mysql db once per day
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example: - backup your mysql db once per day
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```bash
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```bash
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..
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..
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# NOTE: * To disable email notifications use:
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# - for single cronjobs use after the cmd: >/dev/null 2>&1
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# - comment out to disable all email alerts in the crontab:
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#MAILTO=""
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# m h dom mon dow command
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# m h dom mon dow command
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0 0 * * * /usr/local/bin/envs_mysql.sh backup
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0 0 * * * /usr/local/bin/envs_mysql.sh backup
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```
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```
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for more information see the manual pages of crontab(5) and cron(8)
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### at
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the at command lets you specify a one-time action to take place at some desired time.<br />
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for more information see the manual page of at.
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example:<br />
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`echo 'my test in one minute' | at now + 1 min`
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view your at queue:<br />
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`at -l` or `atq`<br />
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`2 Sun Dec 29 14:03:00 2019 a creme`
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delete at job id 2:<br />
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`at -r 2` or `atrm 2`
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## # daemonize processes
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## # daemonize processes
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so you've got a process that you want to keep running. you might have it in a<br />
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so you've got a process that you want to keep running. you might have it in a<br />
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