大约有 47,000 项符合查询结果（耗时：0.0612秒） [XML]
find first sequence item that matches a criterion [duplicate]
...ndly.
– Tomasz Gandor
Mar 18 '16 at 11:38
4
True. If it bugs you enough you could always do def f...
How to print struct variables in console?
... @fnr If you have a JSON document, you would need to unmarshall it, before being able to print its field.
– VonC
Jul 1 '14 at 14:16
...
Easiest way to check for an index or a key in an array?
... associative array)
[ ${array[key]+abc} ] && echo "exists"
Basically what ${array[key]+abc} does is
if array[key] is set, return abc
if array[key] is not set, return nothing
References:
See Parameter Expansion in Bash manual and the little note
if the colon is omitted, the ope...
SSH Key - Still asking for password and passphrase
...ought I set it up. Is the ssh-agent something outside of git I need to install? Thanks
– HelloWorld
Jan 13 '14 at 15:50
2
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MySQL high CPU usage [closed]
...query cache and innodb_buffer_pool_size (if you're using innodb tables) as all of these memory allocations can have an affect on query performance which can cause MySQL to eat up CPU.
You'll also probably want to give the following a read over as they contain some good information.
How MySQL Uses...
What does the ??!??! operator do in C?
...
Trigraphs originally were needed in case you keyboard didn't have eg a '|' symbol. Here it's either the programmer deliberately being annoying or some bizarre editor 'feature'
– Martin Beckett
Oct 19 '1...
Using openssl to get the certificate from a server
...client -showcerts -connect example.com:443) -scq > file.crt
To return all certificates from the chain, just add g (global) like:
ex +'g/BEGIN CERTIFICATE/,/END CERTIFICATE/p' <(echo | openssl s_client -showcerts -connect example.com:443) -scq
Then you can simply import your certificate fi...
Is it safe to use -1 to set all bits to true?
...s one:
unsigned long a = ~0u;
It won't necessarily store a pattern with all bits 1 into a. But it will first create a pattern with all bits 1 in an unsigned int, and then assign it to a. What happens when unsigned long has more bits is that not all of those are 1.
And consider this one, which wi...
An example of how to use getopts in bash
I want to call myscript file in this way:
7 Answers
7
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No connection could be made because the target machine actively refused it?
...
If this happens always, it literally means that the machine exists but that it has no services listening on the specified port, or there is a firewall stopping you.
If it happens occasionally - you used the word "sometimes" - and retrying succeeds, it is l...