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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...收到广播包时，协议栈将向上层（也就是应用层，用户可编程）传递广播包。主动扫描，主动扫描除了完成被动扫描的动作外，还会向从机发送一个扫描请求，从机收到该请求时，会再次发送一个称作扫描回应的广播包。
所以...
echo that outputs to stderr
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In the nearly 40 years that I've been using Unix-like systems it has never occurred to me that you could put the redirect anywhere but at the end. Putting it up front like this makes it much more obvious (or "facilitates reading" as @MarcoAurelio says). +1 for teaching...
Accurate way to measure execution times of php scripts
...unction for this. From the documentation:
microtime — Return current Unix timestamp with microseconds
If get_as_float is set to TRUE, then microtime() returns a float, which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond.
Example us...
Running a Python script from PHP
...anual:
Just a quick reminder for those trying to use shell_exec on a
unix-type platform and can't seem to get it to work. PHP executes as
the web user on the system (generally www for Apache), so you need to
make sure that the web user has rights to whatever files or
directories that you...
Replace whitespaces with tabs in linux
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So cool that these are standard. I love the UNIX philosophy. Would be nice if it could do in place though.
– Matthew Flaschen
Nov 14 '13 at 3:26
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reformat in vim for a nice column layout
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If you're on some kind of UNIX (Linux, etc), you can cheat and filter it through the column(1) command.
:%!column -t
The above will parse on delimiters inside string literals which is wrong, so you will likely need pre-processing steps and specifyi...
More elegant “ps aux | grep -v grep”
...inal, which egrep '[t]erminal' does not! It also works on many flavours of Unix.
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Equivalent of *Nix 'which' command in PowerShell?
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If you want the Unix-style behavior of giving you the path you'll need to pipe the output of get-command to select -expandproperty Path.
– Casey
Jul 29 '15 at 12:37
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Ruby off the rails
... from single input files
Build Support
scripts to generate Makefiles for unix from Visual Studio Project Files
scripts for building projects and formatting the output for Cruise Control
scripts for running our unit tests and formatting the output for Cruise Control
scripts for manipulating Visual ...
Find a class somewhere inside dozens of JAR files?
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Unix
On Linux, other Unix variants, Git Bash on Windows, or Cygwin, use the jar (or unzip -v), grep, and find commands.
The following lists all class files that match a given name:
for i in *.jar; do jar -tvf "$i" | grep -...