大约有 40,000 项符合查询结果（耗时：0.0477秒） [XML]
Run cron job only if it isn't already running
...on job as a sort of watchdog for a daemon that I've created. If the daemon errors out and fails, I want the cron job to periodically restart it... I'm not sure how possible this is, but I read through a couple of cron tutorials and couldn't find anything that would do what I'm looking for...
...
Count occurrences of a char in a string using Bash
...
you can for example remove all other chars and count the whats remains, like:
var="text,text,text,text"
res="${var//[^,]}"
echo "$res"
echo "${#res}"
will print
,,,
3
or
tr -dc ',' <<<"$var" | awk '{ print length; }'
or
tr -dc ',' &l...
Cron and virtualenv
...ll
It's tricky to spot why this fails as /var/log/syslog doesn't log the error details. Best to alias yourself to root so you get emailed with any cron errors. Simply add yourself to /etc/aliases and run sendmail -bi.
More info here:
http://codeinthehole.com/archives/43-Running-django-cronjobs-...
What is the difference between public, protected, package-private and private in Java?
...e MyClass and I'm doing AnotherClass extends MyClass I will have access to all protected and public methods and properties from within AnotherClass. If I do MyClass myClass = new MyClass(); in AnotherClass somewhere - let's say the constructor - I will only have access to the public methods if it is...
How to find common elements from multiple vectors?
...
@GioraSimchoni how could you get c(1,1,3), if that is really what you want?
– StatsSorceress
Aug 25 '18 at 18:01
...
How do you clear the SQL Server transaction log?
... In the shrink process, the files were getting bigger, and an Out of Space error was thrown. Result: I lost the database. Luckly was a log database which had lose tolerance.
– Cesar
Jun 29 '19 at 20:01
...
AngularJS : Factory and Service? [duplicate]
...ating between controllers like sharing data.
Can use other dependencies
Usually used when the service instance requires complex creation logic
Cannot be injected in .config() function.
Used for non configurable services
If you're using an object, you could use the factory provider.
Syntax: module...
How to debug .htaccess RewriteRule not working
...isit your URL. If it is working, you should get a
500 Internal Server Error
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request....
I suggest you to put it soon after RewriteEngine on.
Since you are on your ma...
how to calculate binary search complexity
...
Two answers - First one here: Even if there is no error in the math, we can see that 2.43 average is still better than 3.5 average for linear, and this is at a low value. Once you get into the 100s of entries, log2() is much much better than linear. I think you see this ...
MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
...昨天晚上主动2个机器都迁移了，然后今天才把主动重新连接上，但是从库的偏移量是从今天当前时刻开始的，也就是说虽然现在主...情况时这样的：
昨天晚上主动2个机器都迁移了，然后今天才把主动重新连接上，但是从库的...