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What are the special dollar sign shell variables?
...shell (not subshell).
$_ most recent parameter (or the abs path of the command to start the current shell immediately after startup).
$IFS is the (input) field separator.
$? is the most recent foreground pipeline exit status.
$! is the PID of the most recent background command.
$0 is the name of the...
Using npm behind corporate proxy .pac
...pm config set proxy "http://domain%5Cusername:password@servername:port/"
and with this the proxy access was fixed.
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为维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...
...运算的调整后的峰值速度。
本技术说明涉及的缩写：
n “数字计算机”中的处理器数量
I 处理器编号（1，……，n）
ti 处理器时钟周期（ti=1/Fi）
Fi 处理器频率
Ri 峰值浮点运算速度
Wi 体系结构调整因子
APP用加权万亿次浮...
Format a date using the new date time API
...e. Use a LocalDateTime instead, assuming you want to represent both a date and time.
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How can I hash a password in Java?
... good algorithm to use for password hashing.
byte[] salt = new byte[16];
random.nextBytes(salt);
KeySpec spec = new PBEKeySpec("password".toCharArray(), salt, 65536, 128);
SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
byte[] hash = f.generateSecret(spec).getEncoded();
Bas...
How to open every file in a folder?
...have a python script parse.py, which in the script open a file, say file1, and then do something maybe print out the total number of characters.
...
What is “lifting” in Haskell?
I don't understand what "lifting" is. Should I first understand monads before understanding what a "lift" is? (I'm completely ignorant about monads, too :) Or can someone explain it to me with simple words?
...
How to merge 2 JSON objects from 2 files using jq?
...Here we are merging two json files. Is it possible to have 1 json variable and other json file. I tried but it seems not working for me!
– Jayesh Dhandha
Apr 4 '18 at 9:25
...
What's the point of OOP?
...e of the countless millions or billions spent on OOP education, languages, and tools, OOP has not improved developer productivity or software reliability, nor has it reduced development costs. Few people use OOP in any rigorous sense (few people adhere to or understand principles such as LSP); there...
C# switch statement limitations - why?
...t the same
thing as a big if-else statement.
Each case must be unique and evaluated
statically. The switch statement does
a constant time branch regardless of
how many cases you have. The if-else
statement evaluates each condition
until it finds one that is true.
In fact, the C#...