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What does .class mean in Java?
...the class Print on runtime. It is the same object that is returned by the getClass() method of any (direct) instance of Print.
Print myPrint = new Print();
System.out.println(Print.class.getName());
System.out.println(myPrint.getClass().getName());
...
How do I get the parent directory in Python?
...h Pathlib.
Navigating inside a directory tree:
>>> p = Path('/etc')
>>> q = p / 'init.d' / 'reboot'
>>> q
PosixPath('/etc/init.d/reboot')
>>> q.resolve()
PosixPath('/etc/rc.d/init.d/halt')
Querying path properties:
>>> q.exists()
True
>>>...
Concatenate text files with Windows command line, dropping leading lines
...ch means it's listed at the end of the files in the loaction (alphabetical order), then windows seems to concatenate twice! I ended up using a filename of 1filename.csv to not have the problem. I guess concatting into a different folder should work also...
– SebK
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How can I debug a .BAT script?
... , which calls a lot of other scripts, and I would like to see what is the order in which they are called, so that I may know where exactly I have to go about and add my modifications.
...
How to store standard error in a variable
...up a couple of extra file descriptors to manage the redirections needed in order to do this.
#!/bin/bash
exec 3>&1 4>&2 #set up extra file descriptors
error=$( { ./useless.sh | sed 's/Output/Useless/' 2>&4 1>&3; } 2>&1 )
echo "The message is \"${error}.\""
exec...
Delete all but the most recent X files in bash
...filesystem items sorted by how recently they were modified , in descending order (most recently modified items first) (-t), with directories printed with a trailing / to mark them as such (-p).
grep -v '/$' then weeds out directories from the resulting listing, by omitting (-v) lines that have a tra...
In vim, how do I get a file to open at the same line number I closed it at last time?
...
From Ubuntu's /etc/vim/vimrc file, this example is commented out:
" Uncomment the following to have Vim jump to the last position when
" reopening a file
if has("autocmd")
au BufRead...
String comparison in Python: is vs. == [duplicate]
...or all built-in Python objects (like
strings, lists, dicts, functions,
etc.), if x is y, then x==y is also
True.
Not always. NaN is a counterexample. But usually, identity (is) implies equality (==). The converse is not true: Two distinct objects can have the same value.
Also, is it g...
How is an overloaded method chosen when a parameter is the literal null value?
...
You can assign a string to a null value so it is valid and the order for java and most programming languages is fit to the closest type and then to object.
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C++ lambda with captures as a function pointer
... int {
entries.push_back(fpath);
return 0;
};
int ret = ftw("/etc", callback);
for (auto entry : entries ) {
cout << entry << endl;
}
return ret;
}
Edit:
I had to revisit this when I ran into legacy code where I couldn't modify the original function signature, ...