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How can I check if a file exists in Perl?
...mething exists at given path using the -e file-test operator.
print "$base_path exists!\n" if -e $base_path;
However, this test is probably broader than you intend. The code above will generate output if a plain file exists at that path, but it will also fire for a directory, a named pipe, a syml...
Swift: Pass array by reference?
...For Swift versions 3-4 (XCode 8-9), use
var arr = [1, 2, 3]
func addItem(_ localArr: inout [Int]) {
localArr.append(4)
}
addItem(&arr)
print(arr)
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std::wstring VS std::string
...
string? wstring?
std::string is a basic_string templated on a char, and std::wstring on a wchar_t.
char vs. wchar_t
char is supposed to hold a character, usually an 8-bit character.
wchar_t is supposed to hold a wide character, and then, things get tricky:
On Li...
What is the difference between DSA and RSA?
.../web.archive.org/web/20140212143556/http://courses.cs.tamu.edu:80/pooch/665_spring2008/Australian-sec-2006/less19.html
RSA
RSA encryption and decryption are commutative
hence it may be used directly as a digital signature scheme
given an RSA scheme {(e,R), (d,p,q)}
to sign a message M, compute:
...
How to create a .NET DateTime from ISO 8601 format
... Z actually stands for Zulu time or UTC. en.wikipedia.org/wiki/ISO_8601#UTC
– Peter Stephens
Jun 22 '11 at 19:22
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Can you make valid Makefiles without tab characters?
...
I just found gnu.org/software/make/manual/html_node/Special-Variables.html (see .RECIPEPREFIX). One of the answers below also mentions that, and should be marked as "correct" instead of mine. stackoverflow.com/a/21920142
– Alok Singhal
...
ruby 1.9: invalid byte sequence in UTF-8
...1.8 (iconv) and 1.9 (String#encode) :
require 'iconv' unless String.method_defined?(:encode)
if String.method_defined?(:encode)
file_contents.encode!('UTF-8', 'UTF-8', :invalid => :replace)
else
ic = Iconv.new('UTF-8', 'UTF-8//IGNORE')
file_contents = ic.iconv(file_contents)
end
or if yo...
Error pushing to GitHub - insufficient permission for adding an object to repository database
...ound. Try @Syvex's answer instead (with setgid)
– 4wk_
Jul 9 '15 at 16:02
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Difference between Eclipse Europa, Helios, Galileo
...ing version number go to this website.
http://en.wikipedia.org/wiki/Eclipse_%28software%29#Release
Release Date Platform version
Juno ?? June 2012 4.2?
Indigo 22 June 2011 3.7
Helios 23 June 2010 3.6
Galileo 24 June 2009 3.5
Ganymede 25 June 2008 3.4...
Mac OS X Terminal: Map option+delete to “backward delete word”
...if you don't have checked use option as meta key)
meta+delete will treat / _ as word delimiter where ^W will consider space as delimiter.
e.g.
using ESC+Bakcspace on (cursor at the end)
rm /dira/dirb/file1
gives
rm /dira/dirb/
while ^W on the same will give
rm
So it is better to use \033\1...