Well, a webserver is free to use any character after the leading URI part for whatever purpose it wants. That being said, the use of ~ generally hearkens back to the early days of the web, when just about every web server ran on Unix. In the Unix world, systems supported multiple users, each with … Read more
~ is the destructor Destructors are invoked automatically, and cannot be invoked explicitly. Destructors cannot be overloaded. Thus, a class can have, at most, one destructor. Destructors are not inherited. Thus, a class has no destructors other than the one, which may be declared in it. Destructors cannot be used with structs. They are only … Read more
As per the map help documentation, map needs a function but it also accepts a formula, character vector, numeric vector, or list, the latter of which are converted to functions. The ~ operator in R creates formula. So ~ lm(mpg ~ wt, data = .) is a formula. Formulas are useful in R because they … Read more
If the variable var is input by the user, eval should not be used to expand the tilde using eval var=$var # Do not use this! The reason is: the user could by accident (or by purpose) type for example var=”$(rm -rf $HOME/)” with possible disastrous consequences. A better (and safer) way is to use … Read more
For the sake of completeness … Just path is a file or directory named path in the current directory. ./path is a file or directory named path in the current directory, with the directory spelled out. The dot directory . represents the current directory, and path is the name of the file or directory within … Read more