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Get current directory name (without full path) in a Bash script
...ell input
# ...useful to make hidden characters readable.
Note that if you're applying this technique in other circumstances (not PWD, but some other variable holding a directory name), you might need to trim any trailing slashes. The below uses bash's extglob support ...
Python memoising/deferred lookup property decorator
...be deferred, ie. not be initialised in the constructor but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. Hence they can also be cached after they've been r...
How to ignore certain files in Git
...ly make my point more clear, the index initially (that is, right after git read-tree) "contains" all the files from the tree-ish which had just been read in. Hence making Git "turn a blind eye" to an index entry does not equal actually removing it.
– Xman Classical
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Why is iterating through a large Django QuerySet consuming massive amounts of memory?
...you have everything in memory, and the results come spilling out.
From my reading of the docs, iterator() does nothing more than bypass QuerySet's internal caching mechanisms. I think it might make sense for it to a do a one-by-one thing, but that would conversely require ten-million individual hi...
Explanation of BASE terminology
...
The CAP "theorem" is dissected mathematically (but very readably) and discussed in a uniquely intelligent way by Mark Burgess, whose article I'm in progress reading. (I was linked there in the first place by Wikipedia.)
– Wildcard
Mar 28 '16...
write a shell script to ssh to a remote machine and execute commands
...currently:
pssh -i -h hosts.txt -p 100 -t 0 sleep 10000
Options:
-I: Read input and sends to each ssh process.
-P: Tells pssh to display output as it arrives.
-h: Reads the host's file.
-H : [user@]host[:port] for single-host.
-i: Display standard output and standard error as each host...
Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
Boost.Asio的简单使用(Timer,Thread,Io_service类)2. 同步Timer本章介绍asio如何在定时器上进行阻塞等待(blocking wait).实现,我们包含必要的头文件.所有的asio类可以简单的通过include "...目录：
1. 同步Timer
2. 异步Timer
3. 回调函数的参数
4. 成...
Redis strings vs Redis hashes to represent JSON: efficiency?
...ification of the JSON payload is expected (a classic problem of non-atomic read-modify-write).
– Samveen
Aug 23 '16 at 13:16
1
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Lambda capture as const reference?
...XXX";
[&better_string](string s) {
better_string = s; // error: read-only area.
}
lambda function is const(can't change value in its scope), so when you capture variable by value, the variable can not be changed, but the reference is not in the lambda scope.
...
When should I use jQuery's document.ready function?
I was told to use document.ready when I first started to use Javascript/jQuery but I never really learned why.
8 Answers
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