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How to do a recursive find/replace of a string with awk or sed?
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Note: Do not run this command on a folder including a git repo - changes to .git could corrupt your git index.
find /home/www/ -type f -exec \
sed -i 's/subdomainA\.example\.com/subdomainB.example.com/g' {} +
Compared to other answers here, this is simpler tha...
Why doesn't Python have a sign function?
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EDIT:
Indeed there was a patch which included sign() in math, but it wasn't accepted, because they didn't agree on what it should return in all the edge cases (+/-0, +/-nan, etc)
So they decided to implement only copysign, which (although more verbose) can be u...
How to disable a link using only CSS?
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This now works in all modern browsers including IE 11. If you need support for IE 10 and below, you can use a JavaScript polyfill such as this one.
– Keavon
Jul 31 '14 at 5:13
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Can JSON start with “[”?
.../rfc4627.txt
A JSON text is a sequence of tokens.
The set of tokens includes six
structural characters, strings,
numbers, and three literal names.
A JSON text is a serialized object or array.
Update (2014)
As of March 2014, there is a new JSON RFC (7159) that modifies the definiti...
Check if string contains only digits
... every() method to test whether all elements (characters) in the array are included in the string of digits '0123456789':
const digits_only = string => [...string].every(c => '0123456789'.includes(c));
console.log(digits_only('123')); // true
console.log(digits_only('+123')); // false...
SQL injection that gets around mysql_real_escape_string()
...S"');
As documented under String Literals:
There are several ways to include quote characters within a string:
A “'” inside a string quoted with “'” may be written as “''”.
A “"” inside a string quoted with “"” may be written as “""”.
Precede the quote chara...
Java: function for arrays like PHP's join()?
...it. This solution uses the built in Android libs, rather than these silly "include a huge lib to perform one action" solutions.
– LukeStoneHm
Aug 26 '15 at 14:57
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The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path [duplicate]
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Include servlet-api-3.1.jar in your dependencies.
Maven
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>...
Loop backwards using indices in Python?
...to step backwards.
for i in range(100, -1, -1):
print(i)
NOTE: This includes 100 & 0 in the output.
There are multiple ways.
Better Way
For pythonic way, check PEP 0322.
This is Python3 pythonic example to print from 100 to 0 (including 100 & 0).
for i in reversed(range(101)):
...
How do I use the CONCAT function in SQL Server 2008 R2?
...link you gave makes this clear, it is not a function on Previous Versions, including 2008 R2.
That it is part of SQL Server 2012 can be seen in the document tree:
SQL Server 2012
Product Documentation
Books Online for SQL Server 2012
Database Engine
Transact-SQL Reference (Database Engin...