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What is the use case of noop [:] in bash?
...causes bash to give a syntax error:
line 4: syntax error near unexpected token `fi'
line 4: `fi'
Bash can't have empty blocks (WTF). So you add a no-op:
if [ "$foo" != "1" ]
then
#echo Success
:
fi
or you can use the no-op to comment out the lines:
if [ "$foo" != "1" ]
then
: e...
Node.js setting up environment specific configs to be used with everyauth
...
Example: on my machine the .env file is this:
NODE_ENV=dev
TWITTER_AUTH_TOKEN=something-needed-for-api-calls
My local .env overrides any environment variables. But on the staging or production servers (maybe they're on heroku.com) the environment variables are pre-set to stage NODE_ENV=stage or...
How to loop through files matching wildcard in batch file
... good way to pass commands into f.in and f.out would be to...
for /F %%D "tokens=*" in (dont_pass_through_these.txt) do (
for /F %%E in (%%D) do (
start /wait %%E
)
)
A link to all the Windows XP commands:link
I apologize if I did not answer this correctly. The question was very hard for me to r...
Why are all fields in an interface implicitly static and final?
...constants, or even immutable. You can define e.g.
interface I {
String TOKEN = SomeOtherClass.heavyComputation();
JButton BAD_IDEA = new JButton("hello");
}
(Beware that doing this inside an annotation definition can confuse javac, relating to the fact that the above actually compiles to a ...
Sql Server string to date conversion
...ptional argument - it is based on .Net's format, so most if not all of the token formats you'd expect to see will be there.
DECLARE @d DATETIME = '2008-10-13 18:45:19';
-- returns Oct-13/2008 18:45:19:
SELECT FORMAT(@d, N'MMM-dd/yyyy HH:mm:ss');
-- returns NULL if the conversion fails:
SELECT TRY...
Converting JSON data to Java object
...rror can not deserialize instance of java.util.HashSet out of START_OBJECT token
– Dipen Chawla
May 15 '19 at 8:24
add a comment
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INSERT IF NOT EXISTS ELSE UPDATE?
... your select needs at least WHERE true to solve parser ambiguity about the token ON with the join syntax.
Be warned that INSERT OR REPLACE... will delete the record before inserting a new one if it has to replace, which could be bad if you have foreign key cascades or other delete triggers.
...
How to enter a multi-line command
...
And don't forget to mention that some other tokens also act as line continuators e.g. | and {.
– Keith Hill
Jul 13 '10 at 14:40
1
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Regex to check whether a string contains only numbers [duplicate]
... @D_N. Fair enough. To your original point, yes 008 is an error token in many PLs because it starts like an octal literal, but in standard mathematical notation base ₁₀ is implied. I don't know which the asker wanted and if I were to reject malformed octal, I should match valid hex a...
RSpec vs Cucumber (RSpec stories) [closed]
... product owner's articulation of the features he wants built. This is the "token for a conversation" use of stories, and would be valuable whether or not we implemented the stories in code. Second, when the process is working well enough that we have complete stories before we begin writing the feat...