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Skip download if files exist in wget?
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The answer I was looking for is at https://unix.stackexchange.com/a/9557/114862.
Using the -c flag when the local file is of greater or equal size to the server version will avoid re-downloading.
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The cause of “bad magic number” error when loading a workspace and how to avoid it?
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The magic number comes from UNIX-type systems where the first few bytes of a file held a marker indicating the file type.
This error indicates you are trying to load a non-valid file type into R. For some reason, R no longer recognizes this file as an ...
Group by month and year in MySQL
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Further on this, FROM_UNIXTIME is needed if you have a UNIX timestamp in your DB DATE_FORMAT( FROM_UNIXTIME(t.summaryDateTime), '%Y-%m' )
– Duncanmoo
Jul 12 '12 at 12:21
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Regex Last occurrence?
...lude the backslash, but only the text after it, try this: ([^\\]+)$ or for unix: ([^\/]+)$
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Is there a difference between authentication and authorization?
... you are authorized to do. For example, you are allowed to login into your Unix server via ssh client, but you are not authorized to browser /data2 or any other file system. Authorization occurs after successful authentication........
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Issue with virtualenv - cannot activate
...e venv your virtualenv directory
by cd venv.
Then on Windows, type dir (on unix, type ls).
You will get 5 folders include, Lib, Scripts, tcl and 60
Now type .\Scripts\activate to activate your virtualenv venv.
Your prompt will change to indicate that you are now operating within the virtual envi...
Add number of days to a date
...ntaining a US English date format and will try to parse that format into a Unix timestamp (the number of seconds since January 1 1970 00:00:00 UTC), relative to the timestamp given in now, or the current time if now is not supplied.
while date
Returns a string formatted according to the given...
Gradle store on local file system
...R_HOME environment variable value.
By default, it is $USER_HOME/.gradle on Unix-OS based and %userprofile%.\gradle on Windows.
But if you set this variable, the cache directory would be located from this path.
And whatever the case, you should dig into caches\modules-2\files-2.1 to find the depende...
Using scp to copy a file to Amazon EC2 instance?
...ser@mec2-50-17-16-67.compute-1.amazonaws.com:~/.
See Connecting to Linux/UNIX Instances Using SSH.
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Converting Epoch time into the datetime
...me.gmtime(1347517119))
'2012-09-12 23:18:39'
Also in MySQL, you can FROM_UNIXTIME like:
INSERT INTO tblname VALUES (FROM_UNIXTIME(1347517119))
For your 2nd question, it is probably because getbbb_class.end_time is a string. You can convert it to numeric like: float(getbbb_class.end_time)
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