The ~ (tilde) can have different meanings: it can be an operator, performing a bitwise negation on a binary number - all 1 bits are set to 0 and all 0 bits are set to 1. It can also simply be the tilde character itself, as used in Windows for shortening long path names.
Questions tagged [tilde]
171 questions
0
votes
2 answers
Cannot create directory with tilde
Given this script
# cat foo.sh
echo $HOME
set -x
mkdir ~
I am getting this result
# ./foo.sh
/home/Steven Penny
++ mkdir ''
mkdir: cannot create directory `': No such file or directory
If I run mkdir "$HOME" I have no problem. I think the issue is…
Zombo
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votes
1 answer
How to get real file name without tilde substitution
I use dirent.h library for fetching name of file. While most of them are correct, this one:
1Zdjęcie główne.JPG_38ba97e477158efb3563274f5bd39af7.jpg_cda6829b61253f64b44a5c7f15e00b45 - Copy.jpg
is read as
1ZDJCI~2.JPG
What can I do to…
Arko Jarko
- 39
- 2
0
votes
1 answer
Bit manipulation tilde
I understand that tilde flips every bits, but if I do int num = ~0
Why the result is num = -1 , neither max value of int or unsigned int?
DoReMi
- 221
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- 6
0
votes
2 answers
What is the tight bound for big O?
When referring to big o, what is considered the tight bound?
For example, in the function, f(n) = 10c7n^3 + 10c4nlog(n)) // This function represents the number of operations in terms of n //
according to this example, the tight bound for big O…
Night Owl
- 55
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- 5
0
votes
1 answer
Remap hotkey without losing native hotkey functionality
I want the keyboard shortcut ctrl+tab to perform two functions:
ctrl+tab (its normal function, e.g., to switch tabs in a web browser)
ctrl+F6 (which can be used to switch between Microsoft Word documents, for example)
It doesn't need to be…
Anthony Vella
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- 1
0
votes
2 answers
Any advantage to using variable with tilde in javascript vs. -1?
Other than a slight performance gain, is there an advantage to using !~x as true vs. checking to see if ~-1 ?
user2441849
- 25
- 1
0
votes
2 answers
Multiple checkboxes on a single page
Can anyone help me out with my ratingsystem? I'm trying to duplicate my section with the class of container(Entire progressbar), but whenever I do so the ratingbar only works for either one of the progressbars. I've kept in mind to change the id's…
Stephan-v
- 19,255
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0
votes
1 answer
Microsoft MVC4 ~ Expansion is inconsistent
In MVC, the ~ at the top of a server side directory reference should be converted to the root of the website.
I have the following lines at the top of my cshtml file:
Glenn Gordon
- 1,266
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- 24
0
votes
2 answers
(.htaccess) how to mod_rewrite a tilde user site to subfolder within same site
I have been working this issue for several nights with no luck. I'm trying to Rewrite web requests using (.htaccess)
from: cobweb.seas.gwu.edu/~mpnl
to: cobweb.seas.gwu.edu/~mpnl/joomla
My latest (.htaccess) file is below:
# turn on…
Kirk Woellert
- 13
- 5
0
votes
1 answer
Groovy Regex: What does a tilde in a character class do?
I've got this Regex that comes out of a groovy code:
(?:[^\p{Alnum}äöü**~D~V~\~_**]|^)
(?:sometext|s\.t\.)
(?:[^\p{Alnum}äöü**~D~V~\~_**]|$$)
The only thing I do not understand is this part:
**~D~V~\~_**
What doas the tilde do in there? Is that…
barigorokarl
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- 4
-1
votes
1 answer
Batch: Sequentially write the last modification time of a file into a variable
Within a FOR loop over all files from a folder, I try to set the file time into a variable, but the variable keeps displaying the same value for all files.
Here is the .bat file content:
@echo off
for /f %%a in ('dir /b .\*.*') do (
echo a :…
Javier Perez
- 1
- 2
-1
votes
1 answer
Python Bitwise ~ Operator
Several previously asked questions such as this and this mention only why this happens i.e. 2's compliment.
I need help with how to convert this :
print("if ~(0b11011111) is "+str(bin(~(0b1101111))) +" not 0b00100000")
print("and ~(0b00100000) is "…
Just doin Gods work
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- 4
-1
votes
1 answer
tilde key not working in Fedora Linux on Macbook Air
I am pretty much brand new to Linux and command line. I am trying to learn the commands and I got to a section that needed the ~ key. When I am using Fedora, the ~` key types ><. I have tried searching for this and I cannot find the answer. I have…
Andy
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- 5
-1
votes
1 answer
how to parse/read a tilde delimited table in a .txt file in JAVA and write methods for relational algebra / SQL
trying to write a java class named Algebra that will have static methods representing the relational algebra and one additional method which displays the contents of a tilde table and works with any tilde table.
table will have the following…
Roger Feddering
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- 9
-1
votes
1 answer
Appearance of a tilde(~) in mac OSX terminal in the path
I am new to the Mac OSX environment, and was programming in C using the terminal. To change the current directory, I used the command cd .. to go one level up. However, this had a weird effect on the terminal. A clear screen on my mac terminal…
Manish Giri
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