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...义变量时，变量名不加美元符号（$），如：
your_name="qinjx"
注意，变量名和等号之间不能有空格，这可能和你熟悉的所有编程语言都不一样。
除了显式地直接赋值，还可以用语句给变量赋值，如：
for file in `ls /etc`
使用变...
Windows batch: formatted date into variable
... Variables that will be set: Year, Month, Day, Hour, Minute, Second, Quarter, WeekInMonth, DayOfWeek
– user
Dec 29 '15 at 13:31
2
...
Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
...I found another one excellent and detailed explanation - stackoverflow.com/questions/3601515/…
– valentt
May 11 '17 at 13:17
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What is an xs:NCName type and when should it be used?
...
NCName is non-colonized name e.g. "name". Compared to QName which is qualified name e.g. "ns:name". If your names are not supposed to be qualified by different namespaces, then they are NCNames.
xs:string puts no restrictions on your names at all, but xs:NCName basically disall...
How to Deep clone in javascript
...deep copy function. The function below deep copies objects, and does not require a 3rd party library (jQuery, LoDash, etc).
function copy(aObject) {
if (!aObject) {
return aObject;
}
let v;
let bObject = Array.isArray(aObject) ? [] : {};
for (const k in aObject) {
v = aObject[k]...
How do I create a random alpha-numeric string in C++?
...atic const char alphanum[] =
"0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";
srand( (unsigned) time(NULL) * getpid());
for (int i = 0; i < len; ++i)
tmp_s += alphanum[rand() % (sizeof(alphanum) - 1)];
return ...
How to get a specific output iterating a hash in Ruby?
...gt; [2, 3, 4]
# [:a, :e] => 5
# [:f] => 6
Here is example from the question itself:
hash = {
1 => ["a", "b"],
2 => ["c"],
3 => ["a", "d", "f", "g"],
4 => ["q"]
}
hash.each(recursive=false) do |key, value|
puts "#{key} => #{value}"
end
# 1 =...
Get Android .apk file VersionName or VersionCode WITHOUT installing apk
...information, aapt is in build-tools/XX in the sdk.
– Quentin Klein
Oct 29 '14 at 11:01
8
I found ...
How do I migrate an SVN repository with history to a new Git repository?
I read the Git manual, FAQ, Git - SVN crash course, etc. and they all explain this and that, but nowhere can you find a simple instruction like:
...
What are the most-used vim commands/keypresses?
... file to disk
:w name write file to disk as name
ZZ write file to disk and quit
:n edit a new file; :n! edit a new file without saving current changes
:q quit editing a file; :q! quit editing without saving changes
:e edit same file again (if changed outside vim)
:e . directory explorer
Windows
...