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add crontab support as alarm clock
2023-10-25 05:09:25 +00:00
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="../style.css" type="text/css" />
<title>cron</title>
<script type="text/javascript">
function findLang(){
let href = location.href;
for(let i=href.length-1;i>0;i--){
if('/'==href.charAt(i) && '/'==href.charAt(i-3))
return i;
}
return 0;
}
function nav2(page){
let i = findLang();
location.href = location.href.substring(0,i+1)+page;
}
function nav2Lang(lang){
let i = findLang();
let href = location.href;
location.href = location.href.substring(0,i-2)+lang+location.href.substring(i);
}
</script>
</head>
<body>
<header class='header'>
<a class="logo" href="javascript:void(0)" onclick="return nav2('index.html')">Home</a> <a class="logo" href="javascript:void(0)" onclick="return nav2('tags/index.html')">Tags</a>
<a class="logo" href="javascript:void(0)" onclick="return nav2Lang('zh')">简体中文</a>
<nav>
</nav>
</header>
<br />
<div class="container">
<h1 class="title">cron
<br>
<span class="subtitle"></span>
</h1>
<ul class="tags">
</ul>
internal links as sixth field in crontab
2023-10-25 23:37:29 +00:00
<h4 id="crontab-with-enhanced-semantics">crontab (with enhanced semantics)</h4>
add crontab support as alarm clock
2023-10-25 05:09:25 +00:00
<p>For performance, the file &quot;crontab&quot; uses single space as field separator. Letters are not suppored currently. So use &quot;1&quot; for &quot;January&quot; and 2 for &quot;Tuesday&quot; etc.</p>
internal links as sixth field in crontab
2023-10-25 23:37:29 +00:00
<p>The sixth field in crontab file has the format of <a href="../links/index.html">internal links</a>. Specifically, &quot;c:&quot; to execute the following commands in termux and &quot;!&quot; to execute commands directly.</p>
<p>To make crontab more powerful, we changed the semantics as follows:<br>
The day of a command's execution can be specified by two fields — day of month, and day of week. The command will be run when <span style="color:red">both</span> fields matche the current time.</p>
<p>Note (the original crantab semantics):<br>
The day of a command's execution can be specified by two fields — day of month, and day of week. If both fields are restricted (i.e., aren't *), the command will be run when either field matches the current time. For example, ``30 4 1,15 * 5'' would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.</p>
add crontab support as alarm clock
2023-10-25 05:09:25 +00:00
<h4 id="tcron">tcron</h4>
<p>With the option &quot;custom file handling&quot; enabled, &quot;default.rc&quot; runs as shell script at uweb launching time and &quot;default.rc2&quot; runs whenever uweb becomes foreground.</p>
<p>Use tcron (<a href="i:0bhttps://fastly.jsdelivr.net/gh/torappinfo/uwebjs/bin/tcron.tgz">Click to install</a>) with &quot;default.rc&quot; or &quot;default.rc2&quot;.</p>
<p>usage: tcron logfile command hours [timezone delay_sec elsecommand]<br>
execute &quot;command&quot; during time interval once.<br>
where logfile modification time must be updated if &quot;command&quot; runs successfully.</p>
<p>hours: If positive, then each day is divided into multiple intervals (unit: hour), and in each interval, the &quot;command&quot; runs only once.<br>
If negative, then the unit is minute.<br>
hours could be also in &quot;hh:mm-hh:mm,...&quot; format. Ex. &quot;6:00-8:30,11:00-13:00,5:30-6:30&quot;.<br>
timezone: an integer, default to be &quot;8&quot; for Beijing China (UTC+8). &quot;0&quot; for Greenwich UK (UTC+0).<br>
delay_sec: execute &quot;command&quot; after &quot;delay_sec&quot; seconds.<br>
elsecommand: executed whenever &quot;command&quot; not run.</p>
<p>ex:<br>
set PATH=/system/bin:/data/data/info.torapp.uweb/files/bin<br>
#Empty the folder &quot;baidu&quot; every 30 days.<br>
tcron /sdcard/b &quot;rm -rf /sdcard/baidu/*;toybox touch /sdcard/b&quot; 720</p>
<p><a target="_self" href="i:0hdefault.rc:../searchurl/txt/default.rc">Install example default.rc file for termux</a></p>
</div>
<p>Last Modified: 25 October 2023<br>
internal links as sixth field in crontab
2023-10-25 23:37:29 +00:00
crontab support<br>
add crontab support as alarm clock
2023-10-25 05:09:25 +00:00
<pre></pre>
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