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How do I write the 'cd' command in a makefile?
...ommands as well. Note that you cannot use newlines as they are interpreted by make as the end of the rule, so any newlines you use for clarity needs to be escaped by a backslash.
For example:
all:
cd some_dir; echo "I'm in some_dir"; \
gcc -Wall -o myTest myTest.c
Note also tha...
Difference between Hashing a Password and Encrypting it
...gned to prevent the occurrence of collisions. You can attack a secure hash by the use of a rainbow table, which you can counteract by applying a salt to the hash before storing it.
Encrypting is a proper (two way) function. It's reversible, you can decrypt the mangled string to get original string ...
How can I get Git to follow symlinks?
...t since Git 1.6.1. Git used to behave this way, and no longer does.
Git by default attempts to store symlinks instead of following them (for compactness, and it's generally what people want).
However, I accidentally managed to get it to add files beyond the symlink when the symlink is a director...
Comparing two java.util.Dates to see if they are in the same day
...e above will for both dates compute the day relative to the time zone used by the computer it is running on. If this is not what you need, you have to pass the relevant time zone(s) to the Calendar.getInstance() calls, after you have decided what exactly you mean with "the same day".
And yes, Joda ...
Standardize data columns in R
... is accepted, I'll provide another answer for reference.
scale is limited by the fact that it scales all variables. The solution below allows to scale only specific variable names while preserving other variables unchanged (and the variable names could be dynamically generated):
library(dplyr)
se...
How to clone git repository with specific revision/changeset?
...mit enabling this feature. Note that some Git servers activate this option by default, e.g. Bitbucket Server enabled it since version 5.5+. See this answer on Stackexchange for a exmple of how to activate the configuration option.
UPDATE 1 For Git versions 1.7 < v < 2.5 use git clone and git...
ERROR 1396 (HY000): Operation CREATE USER failed for 'jack'@'localhost'
...' did not work for me, after doing a bit of research, I found the solution by revoking all access and dropping the user, I don't think so, flush operation will help in similar cases, I have shared my detailed explanation on this page rathishkumar.in/2018/10/…
– Rathish
...
What is ApplicationException for in .NET?
.... The ApplicationException class differentiates between exceptions defined by applications versus exceptions defined by the system.
If you are designing an application that needs to create its own exceptions, you are advised to derive custom exceptions from the Exception class. It was originally tho...
javac error: Class names are only accepted if annotation processing is explicitly requested
...
I was stumped by this too because I was including the .Java extension ... then I noticed the capital J.
This will also cause the "annotation processing" error:
javac myclass.Java
Instead, it should be:
javac myclass.java
...
To underscore or to not to underscore, that is the question
...lds with an underscore in C# if the binary version is going to be consumed by other framework languages? For example since C# is case-sensitive you can call a field "foo" and the public property "Foo" and it works fine.
...