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How to convert a string from uppercase to lowercase in Bash? [duplicate]
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If you are using bash 4 you can use the following approach:
x="HELLO"
echo $x # HELLO
y=${x,,}
echo $y # hello
z=${y^^}
echo $z # HELLO
Use only one , or ^ to make the first letter lowercase or uppercase.
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sprintf like functionality in Python
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Python has a % operator for this.
>>> a = 5
>>> b = "hello"
>>> buf = "A = %d\n , B = %s\n" % (a, b)
>>> print buf
A = 5
, B = hello
>>> c = 10
>>> buf = "C = %d\n" % c
>>> print buf
C = 10
See this reference for all supported fo...
Concatenating null strings in Java [duplicate]
...at the bytecode! The compiler takes your code:
String s = null;
s = s + "hello";
System.out.println(s); // prints "nullhello"
and compiles it into bytecode as if you had instead written this:
String s = null;
s = new StringBuilder(String.valueOf(s)).append("hello").toString();
System.out.printl...
How to ignore certain files in Git
I have a repository with a file, Hello.java . When I compile it, an additional Hello.class file is generated.
21 Answers...
Convert object string to JSON
...ou could use eval then JSON.stringify the result. Like this:
var str = "{ hello: 'world', places: ['Africa', 'America', 'Asia', 'Australia'] }";
var json = JSON.stringify(eval("(" + str + ")"));
Note that when you eval an object literal, it has to be wrapped in parentheses, otherwise the braces a...
How to get the number of characters in a std::string?
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If you're using a std::string, call length():
std::string str = "hello";
std::cout << str << ":" << str.length();
// Outputs "hello:5"
If you're using a c-string, call strlen().
const char *str = "hello";
std::cout << str << ":" << strlen(str);
// Out...
How does the compilation/linking process work?
...compiles a C/C++ program into executable in 4 steps.
For example, gcc -o hello hello.c is carried out as follows:
1. Pre-processing
Preprocessing via the GNU C Preprocessor (cpp.exe), which includes
the headers (#include) and expands the macros (#define).
cpp hello.c > hello.i
The re...
What is the difference between print and puts?
...ne after the final argument, while print does not.
2.1.3 :001 > print 'hello', 'world'
helloworld => nil
2.1.3 :002 > puts 'hello', 'world'
hello
world
=> nil
2.1.3 :003 > $, = 'fanodd'
=> "fanodd"
2.1.3 :004 > print 'hello', 'world'
hellofanoddworld => nil
2.1.3 :005 &...
Convert HashBytes to VarChar
...se where:
SELECT SUBSTRING(master.dbo.fn_varbintohexstr(HashBytes('MD5', 'HelloWorld')), 3, 32)
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Recommendations of Python REST (web services) framework? [closed]
... if not name:
name = 'world'
return {'message': 'Hello, ' + name + '!'}
if __name__ == "__main__":
app.run()
The service's logic is implemented only once, and the correct representation selection (Accept header) + dispatch to the proper render function (or template) ...