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How to upgrade PostgreSQL from version 9.6 to version 10.1 without losing data?
I'm using the PostgreSQL database for my Ruby on Rails application (on Mac OS X 10.9).
15 Answers
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Only get hash value using md5sum (without filename)
...he - indicates the source as stdin). – You must tell bash to capture those words into a string, using Command Substitution: $( command ). – The ( brackets ) produce a bash array with 2 elements. However, you must assign that array construct ( … ) to an variable name; hence, using md5 as the...
How to determine the Boost version on a system?
Is there a quick way to determine the version of the Boost C++ libraries on a system?
11 Answers
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Reload Flask app when template file changes
...ment to Flask().run(), a collection of filenames to watch: any change on those files will trigger the reloader.
Example:
from os import path, walk
extra_dirs = ['directory/to/watch',]
extra_files = extra_dirs[:]
for extra_dir in extra_dirs:
for dirname, dirs, files in walk(extra_dir):
...
How to Batch Rename Files in a macOS Terminal?
...se you can use the following bash command (bash is the default shell on macOS):
for f in *.png; do echo mv "$f" "${f/_*_/_}"; done
Note: If there's a chance that your filenames start with -, place -- before them[1]:
mv -- "$f" "${f/_*_/_}"
Note: echo is prepended to mv so as to perform a dry ru...
Failed to build gem native extension (installing Compass)
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This fixes the error on Ubuntu, but it seems OP is using OSX.
– mhnagaoka
Oct 8 '14 at 5:33
1
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lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...大大降低系统的维护成本。下面对lua和c/c++的交互调用做一个实例分析：
lua提供了API用于在c/c++中构造lua的运行环境，相关接口如下：
//创建lua运行上下文
lua_State* luaL_newstate(void) ;
//加载lua脚本文件
int luaL_loadfile(lua_State *L, co...
Running a command in a Grunt Task
...cts) in my project. I've created a custom tag and I am wondering if it is possible to run a command into it.
6 Answers
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How to call a method after a delay in Android
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Kotlin
Handler(Looper.getMainLooper()).postDelayed({
//Do something after 100ms
}, 100)
Java
final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
@Override
public void run() {
//Do...
Why do I get a SyntaxError for a Unicode escape in my file path?
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why triple `\`? Editing typo? Ok now I see post history and someone fixed formatting not carefully enough, so I've fixed that. Please familiarize yourself it with SO features.
– Marek R
Jan 20 at 11:17
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