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What is the behavior difference between return-path, reply-to and from?
...er already exists in the message, then that header is removed and replaced by the recipient's mail server.
All bounces that occur during the SMTP session should go back to the Return-Path address. Some servers may accept all email, and then queue it locally, until it has a free thread to deliver i...
What is a “batch”, and why is GO used?
...separate each country code into a separate transaction - which can be done by separating them on the client with go.
Some SQL statements MUST be separated by GO from the following ones in order to work.
For example, you can't drop a table and re-create the same-named table in a single transaction, ...
How do I select a merge strategy for a git rebase?
...t rebase --strategy recursive --strategy-option theirs ${branch} as stated by the documentation)
From Git v1.7.3 Release Notes:
git rebase --strategy <s> learned the --strategy-option/-X option to pass extra options that are understood by the chosen merge strategy.
NB: "Ours" and "theirs" ...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
...the total amount of memory in the Java virtual machine. The value returned by this method may vary over time, depending on the host environment.
Note that the amount of memory required to hold an object of any given type may be implementation-dependent.
maxMemory()
Returns the maximum amount of m...
What is Inversion of Control?
...llChecker class.
In the second code example we are creating an abstraction by having the SpellChecker dependency class in TextEditor's constructor signature (not initializing dependency in class). This allows us to call the dependency then pass it to the TextEditor class like so:
SpellChecker sc = n...
Search for executable files using find command
...n GNU find. In particular, -executable tests that the file can be executed by the current user, while -perm +111 just tests if any execute permissions are set.
Older versions of GNU find also support the -perm +111 syntax, but as of 4.5.12 this syntax is no longer supported. Instead, you can use -p...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
...UNIX) and according to range:
1-127 are user defined codes (so generated by calling exit(n))
128-255 are codes generated by termination due to different unix signals like SIGSEGV or SIGTERM
But I don't think you should care while coding on Java, it's just a bit of information. It's useful if you...
What is the >>>= operator in C?
Given by a colleague as a puzzle, I cannot figure out how this C program actually compiles and runs. What is this >>>= operator and the strange 1P1 literal? I have tested in Clang and GCC. There are no warnings and the output is "???"
...
SQL to determine minimum sequential days of access?
...d, 0, uh1.CreationDate), 0))
AND uh1.UserId = uh2.UserId
GROUP BY uh1.Id, uh1.UserId
) as Tbl
WHERE Conseq >= @days
EDIT:
[Jeff Atwood] This is a great fast solution and deserves to be accepted, but Rob Farley's solution is also excellent and arguably even faster (!). Please c...
Need some clarification about beta/alpha testing on the developer console
...ing, closed testing, pausing tracks and stage rollouts, don't get confused by these terms.
1. Open testing - It means that you don't need to invite them, like no need to take their Gmail and add it to the user list. (Beta testing)
2. Closed testing - It means that you need to specifically add the us...