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What does “@” mean in Windows batch scripts
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It inherits the meaning from DOS. @:
In DOS version 3.3 and later, hides the echo of a batch command. Any output generated by the command is echoed.
Without it, you could turn off command echoing using the echo off command, but that command would be echoed first.
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Execute SQLite script
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You want to feed the create.sql into sqlite3 from the shell, not from inside SQLite itself:
$ sqlite3 auction.db < create.sql
SQLite's version of SQL doesn't understand < for files, your shell does.
share
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Switch branch names in git
... the problem. I was working on master and committed some stuff and then decided I wanted to put that work on hold. I backed up a few commits and then branched from before I started my crap work. Practically this works fine, I just now have a different branch as my main development branch. I'm wonder...
Segmentation fault on large array sizes
...he from any other compilation unit. To make sure this doesn't happen by accident, add a static storage specifier, otherwise just use the heap.
This will allocate in the BSS segment, which is a part of the heap:
static int c[1000000];
int main()
{
cout << "done\n";
return 0;
}
This wi...
Heroku Postgres - terminate hung query (idle in transaction)
...s a general Postgres answer, and not specific to heroku
(The simple-stupid answer to this question may be ... just restart postgresql. Assuming that's not desirable or not an option ...)
Find the PID by running this sql:
SELECT pid , query, * from pg_stat_activity
WHERE state != 'idle' ORDER...
How can I prevent the “You have mixed tabs and spaces. Fix this?” message?
...you working with other developers who have different tab settings in their IDE?
UPDATE: In Visual Studio 2017 and onward, this is a stand-alone extension named "Fix Mixed Tabs" that can be disabled or uninstalled from "Extensions and Updates" window (Tools > Extensions and Updates).
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How to create a template function within a class? (C++)
...'s actually standard c++. You can do struct A { template<typename> void f(); }; template<> void A::f<int>() { } for example. You just can't specialize them in class scope, but you can do so well when done in namespace scope. (not to be confused with the scope that the specializatio...
Usage of sys.stdout.flush() method
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Consider the following simple Python script:
import time
import sys
for i in range(5):
print(i),
#sys.stdout.flush()
time.sleep(1)
This is designed to print one number every second for five seconds, but if you run...
How can I map True/False to 1/0 in a Pandas DataFrame?
... Dec 24 '19 at 20:27
Bruno BenevidesBruno Benevides
2122 bronze badges
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How do I verify that an Android apk is signed with a release certificate?
How can I check that an Android apk is signed with a release and not debug cert?
5 Answers
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