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Difference between dispatch_async and dispatch_sync on serial queue?
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410
Yes. Using serial queue ensure the serial execution of tasks. The only difference is that dispa...
Run Cron job every N minutes plus offset
...-59/20 * * * *
Explanation
An * in the minute field is the same as 0-59/1 where 0-59 is the range and 1 is the step. The command will run at the first minute in the range (0), then at all successive minutes that are distant from the first by step (1), until the last (59).
Which is why */20 * * *...
Python module os.chmod(file, 664) does not change the permission to rw-rw-r— but -w--wx----
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130
Found this on a different forum
If you're wondering why that leading zero is important, it...
XPath: select text node
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187
Having the following XML:
<node>Text1<subnode/>text2</node>
How d...
How to use a custom comparison function in Python 3?
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edited Feb 6 '19 at 6:19
caot
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answered Mar 28 '10 ...
“Insert if not exists” statement in SQLite
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147
If you have a table called memos that has two columns id and text you should be able to do lik...
Using CSS how to change only the 2nd column of a table
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answered Mar 29 '10 at 0:04
Nick Craver♦Nick Craver
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How do I find the most recent git commit that modified a file?
... the one most recent commit, for example to use it in a script, use the -n 1 option:
git log -n 1 --pretty=format:%H -- my/file.c
--pretty=format:%h tells git log to show only the commit hash. The -- separater stops the file name from getting interpreted as a commit name, just in case it's ambigu...
Logging framework incompatibility
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112
You are mixing the 1.5.6 version of the jcl bridge with the 1.6.0 version of the slf4j-api; th...
What is the difference between class and instance attributes?
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Beyond performance considerations, there is a significant semantic difference. In the class a...