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How to automatically generate a stacktrace when my program crashes
...main+0xdb)[0x3a9b91c4bb]
./test[0x40086a]
This shows the load module, offset, and function that each frame in the stack came from. Here you can see the signal handler on top of the stack, and the libc functions before main in addition to main, foo, bar, and baz.
...
How do you deal with configuration files in source control?
...default, and then if the override file is present, loads that and uses any settings from the override in preference to the default file.
In general, the smaller the override file the better, but it can always contain more settings for a developer with a very non-standard environment.
...
Java generics - why is “extends T” allowed but not “implements T”?
...ompile time enforcement of only accepting classes that implement a certain set of interfaces, and then be able to reference the OBJECT class ( that exhibits those interfaces) in the generic and then know that at least at compile time ( and desirably at run time ) anything assigned to the generic can...
How to create a zip archive of a directory in Python?
...
Use shutil, which is part of python standard library set.
Using shutil is so simple(see code below):
1st arg: Filename of resultant zip/tar file,
2nd arg: zip/tar,
3rd arg: dir_name
Code:
import shutil
shutil.make_archive('/home/user/Desktop/Filename','zip','/home/user...
The tilde operator in Python
...an be useful sometimes, e.g., below ~ operator is used to cleanse your dataset and return you a column without NaN.
from numpy import NaN
import pandas as pd
matrix = pd.DataFrame([1,2,3,4,NaN], columns=['Number'], dtype='float64')
# Remove NaN in column 'Number'
matrix['Number'][~matrix['Number']...
Copy constructor for a class with unique_ptr
...ve:
A( A&& a ) : up_( std::move( a.up_ ) ) {}
Having a complete set of the necessary operators also leads to
A& operator=( const A& a )
{
up_.reset( new int( *a.up_ ) );
return *this,
}
A& operator=( A&& a )
{
up_ = std::move( a.up_ );
return *this,
}
I...
How do you view ALL text from an ntext or nvarchar(max) in SSMS?
... This value defaults to 256. Increase this value to display larger result sets without truncation. The maximum value is 8,192.
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Does Java support default parameter values?
...lder {
private String a = "";
private Integer b = 0;
FooBuilder setA(String a) {
this.a = a;
return this;
}
FooBuilder setB(Integer b) {
this.b = b;
return this;
}
Foo build() {
return new Foo(a, b);
}
}
Foo foo = new FooBuilder().setA("a").bui...
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
...sword
sqlplus / as sysdba
(Replace system-password with the password you set for the SYS and SYSTEM users during the Oracle XE installation.)
The first of these three connect via the TNS listener, but the second two connect directly to the database without going via the listener, and only work if...
Use PPK file in Mac Terminal to connect to remote connection over SSH [closed]
...ivatekey.pem user@my.server.com
The private key must have tight security settings otherwise SSH complains. Make sure only the user can read the key.
chmod go-rw privatekey.pem
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