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String replacement in java, similar to a velocity template
...o the pattern at the appropriate places.
Object[] params = new Object[]{"hello", "!"};
String msg = MessageFormat.format("{0} world {1}", params);
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Syntax for a single-line Bash infinite while loop
...n a single line, correctly punctuated.
$ while true
> do
> echo "hello"
> sleep 2
> done
hello
hello
hello
^C
$ <arrow up> while true; do echo "hello"; sleep 2; done
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How to extract numbers from a string in Python?
...'d use a regexp :
>>> import re
>>> re.findall(r'\d+', 'hello 42 I\'m a 32 string 30')
['42', '32', '30']
This would also match 42 from bla42bla. If you only want numbers delimited by word boundaries (space, period, comma), you can use \b :
>>> re.findall(r'\b\d+\b', '...
Perl build, unit testing, code coverage: A complete working example
...reate a "lib" directory and a "t" directory under your project directory:
HelloPerlBuildWorld
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|----------> lib
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|----------> t
In the "lib" directory, create a text file named "HelloPerlBuildWorld.pm". This file is your Perl module that you will be buildi...
Combining “LIKE” and “IN” for SQL Server [duplicate]
... statements
SELECT * FROM table
WHERE column LIKE 'Text%' OR column LIKE 'Hello%' OR column LIKE 'That%'
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Getting an “ambiguous redirect” error
... all return different error messages for basically the same error:
$ echo hello >
bash: syntax error near unexpected token `newline`
$ echo hello > ${NONEXISTENT}
bash: ${NONEXISTENT}: ambiguous redirect
$ echo hello > "${NONEXISTENT}"
bash: : No such file or directory
Adding quotes ar...
Get nth character of a string in Swift programming language
...s opposed to refactoring the entire project. Make your choice.
let str = "Hello, world!"
let index = str.index(str.startIndex, offsetBy: 4)
str[index] // returns Character 'o'
let endIndex = str.index(str.endIndex, offsetBy:-2)
str[index ..< endIndex] // returns String "o, worl"
String(str.suf...
What is the difference between char array and char pointer in C?
... a pointer, so if you try to pass an array to it like this:
char s[10] = "hello";
printSomething(s);
The compiler pretends that you wrote this:
char s[10] = "hello";
printSomething(&s[0]);
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Abort makefile if variable not set
...
If you need a custom error message, add it after the ?:
$ cat Makefile
hello:
echo "hello $${name:?please tell me who you are via \$$name}"
$ make hello
echo "hello ${name:?please tell me who you are via \$name}"
/bin/sh: name: please tell me who you are via $name
make: *** [hello] Erro...
JUnit test for System.out.println()
...rr);
}
sample test cases:
@Test
public void out() {
System.out.print("hello");
assertEquals("hello", outContent.toString());
}
@Test
public void err() {
System.err.print("hello again");
assertEquals("hello again", errContent.toString());
}
I used this code to test the command line...