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Script parameters in Bash
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The arguments that you provide to a bashscript will appear in the variables $1 and $2 and $3 where the number refers to the argument. $0 is the command itself.
The arguments are seperated by spaces, so if you would provide the -from and -to in the com...
XPath to select multiple tags
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That is super. Where did you come up with that?
– Keith Tyler
Jan 10 '19 at 2:42
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How do I write good/correct package __init__.py files
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__all__ is very good - it helps guide import statements without automatically importing modules
http://docs.python.org/tutorial/modules.html#importing-from-a-package
using __all__ and import * is redundant, only __all__ is needed
I think one of the most pow...
Can a Windows batch file determine its own file name?
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p -- path
n -- file name
x -- extension
f -- full path
E.g., from inside c:\tmp\foo.bat, %~nx0 gives you "foo.bat", whilst %~dpnx0 gives "c:\tmp\foo.bat". Note the pieces are always assembled in canonical order, so if you get cute and try %~xnpd0, you still get "c:\tmp\foo.bat"
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Change old commit message on Git
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I did that, and then commits from other branches show up in my branch
– Reza
Jul 20 at 19:18
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How to use > in an xargs command?
... must always be a single completely separate argument to the command to avoid code injection bugs. What you need to do, is this:
xargs -I{} sh -c 'grep ABC "$1" > "$1.out"' -- {}
Applies to xargs as well as find.
By the way, never use xargs without the -0 option (unless for very rare and con...
How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly
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As an aside - you shouldn't be naming your anonymous (lambda) functions. Always use a def statement instead of an assignment statement that binds a lambda expression directly to an identifier.
– ron_g
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Mongoose populate after save
...k) {
book
.populate('_creator')
.populate('/* Some other ObjectID field */', function(err, book) {
// Do something
})
});
But don't be silly, like me, and try to do this:
book.save(function(err, book) {
book
.populate('_creator')
.populate('/* Some other ObjectID...
How to tell if JRE or JDK is installed
... @Pacerier You can edit / or make a entry if none found - inside your environmental variables.
– Maciej Cygan
Dec 11 '14 at 13:19
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How to pass a class type as a function parameter
... I'm making a button. In that button's code (it's SpriteKit, so inside touchesBegan) I want the button to call a Class function, so need a reference to that class. So in the Button Class I have created a variable to hold a reference to the Class. But I can't get it to hold a Class, or the Ty...