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How do you round a floating point number in Perl?
...f perldoc -q round
Does Perl have a round() function? What about ceil() and floor()?
Trig functions?
Remember that int() merely truncates toward 0. For rounding to a certain number of digits, sprintf() or printf() is usually the easiest
route.
printf("%.3f", 3.1415926535); # prints 3...
SQL - Query to get server's IP address
...u the IP Address;
This will work for a remote client request to SQL 2008 and newer.
If you have Shared Memory connections allowed, then running above on the server itself will give you
"Shared Memory" as the value for 'net_transport', and
NULL for 'local_net_address', and
'<local machi...
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”. error
...ove error came after updating the m2e to version 1.1. By removing m2e 1.1 and rolling back to m2e 1.0 everything worked fine. I tried to repeat the problem in Windows and Ubuntu and it gave me the exact same error. Numerous configurations of the slf4j-api and logback were tested but none seem to w...
Unix command-line JSON parser? [closed]
...
You can use this command-line parser (which you could put into a bash alias if you like), using modules built into the Perl core:
perl -MData::Dumper -MJSON::PP=from_json -ne'print Dumper(from_json($_))'
...
How to run a shell script at startup
On an Amazon S3 Linux instance, I have two scripts called start_my_app and stop_my_app which start and stop forever (which in turn runs my Node.js application). I use these scripts to manually start and stop my Node.js application. So far so good.
...
可重入函数、不可重入函数及线程安全 - C/C++ - 清泛网 - 专注C/C++及内核技术
... fsync
pipe
sigaction
tcgetpgrp
cfgetospeed
ftruncate
poll
sigaddset
tcsendbreak
cfsetispeed
getegid
posix_trace_event
sigdelset
tcsetattr
cfsetospeed
geteuid
...
How can I measure the actual memory usage of an application or process?
...r example, Valgrind can give you insights about the amount of memory used, and, more importantly, about possible memory leaks in your program. The heap profiler tool of Valgrind is called 'massif':
Massif is a heap profiler. It performs detailed heap profiling by taking regular snapshots of a prog...
How using try catch for exception handling is best practice
...o the Database once it is available again. Your invalid
String-To-Number casting could be tried to parse again with
language-local interpretation on Exception, like as you try default
English language to Parse("1,5") fails and you try it with German
interpretation again which is completely f...
How to “hibernate” a process in Linux by storing its memory to disk and restoring it later?
... would to write all the memory used by a process to disk, free up the RAM. And then later on, I can 'resume the process', i.e, reading all the data from memory and put it back to RAM and I can continue with my process?
...
How do I create my own URL protocol? (e.g. so://…) [closed]
...ocol-name Protocol"
URL Protocol ""
shell/
open/
command/
(Default) PathToExecutable
Sources: https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml,
http://msdn.microsoft.com/en-us/library/aa767914(v=vs.85).aspx
...