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What is the purpose of “&&” in a shell command?
...the || which is an OR_IF with similar semantics.
Grammar symbols, quoted from the documentation:
%token AND_IF OR_IF DSEMI
/* '&&' '||' ';;' */
And the Grammar (also quoted from the documentation), which shows that any number of AND_IFs (&&) and/or OR_I...
How can I check in a Bash script if my local Git repository has changes?
...t you meant was:
if [ -n "$CHANGED" ]; then
VN="$VN-mod"
fi
A quote from Git's GIT-VERSION-GEN:
git update-index -q --refresh
test -z "$(git diff-index --name-only HEAD --)" ||
VN="$VN-dirty"
It looks like you were copying that, but you just forgot that detail of quoting.
Of course, you c...
input() error - NameError: name '…' is not defined
...t() was renamed to input(). That is, the new input() function reads a line from sys.stdin and returns it with the trailing newline stripped. It raises EOFError if the input is terminated prematurely. To get the old behavior of input(), use eval(input())
In Python 2.7, there are two functions whi...
Why is creating a new process more expensive on Windows than Linux?
...
mweerden: NT has been designed for multi-user from day one, so this is not really a reason. However, you are right about that process creation plays a less important role on NT than on Unix as NT, in contrast to Unix, favors multithreading over multiprocessing.
Rob, it ...
Why does running the Flask dev server run itself twice?
...t once, ensuring that it also gets called when running under wsgi (ie. not from app.run), but not waiting for the first request? I don't want that first request to be burdened with the initialisation cost.
– Kylotan
Jun 9 '15 at 8:49
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Named string formatting in C#
...matWith(user);
A third improved method partially based on the two above, from Phil Haack
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Concatenating two lists - difference between '+=' and extend()
...
From the CPython 3.5.2 source code:
No big difference.
static PyObject *
list_inplace_concat(PyListObject *self, PyObject *other)
{
PyObject *result;
result = listextend(self, other);
if (result == NULL)
...
Add default value of datetime field in SQL Server to a timestamp
I've got a table that collects forms submitted from our website, but for some reason, when they created the table, they didn't put a timestamp in the table. I want it to enter the exact date and time that the record was entered.
...
What are the -Xms and -Xmx parameters when starting JVM?
...the JVM can/will use more memory than just the size allocated to the heap. From Oracle's documentation:
Note that the JVM uses more memory than just the heap. For example Java methods, thread stacks and native handles are allocated in memory separate from the heap, as well as JVM internal data s...
How can I stage and commit all files, including newly added files, using a single command?
...th a message with:
git coa "A bunch of horrible changes"
Explanation (from git add documentation):
-A, --all, --no-ignore-removal
Update the index not only where the working tree has a file matching but also where the index already has an
entry. This adds, modifies, and removes inde...