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Shell script to send email [duplicate]
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Don't forget to install the mail program first: sudo apt-get install mailutils
– Yonatan Simson
Jan 25 '17 at 16:13
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Spring Java Config: how do you create a prototype-scoped @Bean with runtime arguments?
... its BeanFactory#getBean(String name, Object... args) method which states
Allows for specifying explicit constructor arguments / factory method
arguments, overriding the specified default arguments (if any) in the
bean definition.
Parameters:
args arguments to use if creating a prototype using expl...
Convert RGBA PNG to RGB with PIL
...thod is required for the split method. And that's awesome to hear it's actually fast /and/ simple!
– Yuji 'Tomita' Tomita
Feb 27 '12 at 18:16
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Creating hard and soft links using PowerShell
... Worked also on a Windows10 system.
– FooF
Feb 21 '19 at 4:09
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MySQL Conditional Insert
... AND item = 456)
In this, dual is a table with one row only (found originally in Oracle, now in mysql too). The logic is that the SELECT statement generates a single row of data with the required values, but only when the values are not already found.
Alternatively, look at the MERGE statement.
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Multiline string literal in C#
...nt of a string to form a verbatim string literal:
string query = @"SELECT foo, bar
FROM table
WHERE id = 42";
You also do not have to escape special characters when you use this method, except for double quotes as shown in Jon Skeet's answer.
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What does !! mean in ruby?
...:
!!nil #=> false
!!"abc" #=> true
!!false #=> false
It's usually not necessary to use though since the only false values to Ruby are nil and false, so it's usually best to let that convention stand.
Think of it as
!(!some_val)
One thing that is it used for legitimately is preventi...
How to select from subquery using Laravel Query Builder?
...y there is no method to create subquery in FROM clause, so you need to manually use raw statement, then, if necessary, you will merge all the bindings:
$sub = Abc::where(..)->groupBy(..); // Eloquent Builder instance
$count = DB::table( DB::raw("({$sub->toSql()}) as sub") )
->mergeBin...
How to represent multiple conditions in a shell if statement?
...n this particular case, the parentheses aren't even needed, because -a actually has higher precedence than -o (unlike && and || in the shell - however, inside bash [[ ... ]] conditionals, && also has higher precedence than || ). If you wanted to avoid -a and -o for maximum robustness...
How to call a function from a string stored in a variable?
...ble to pass arguments using both of these methods as so
$function_name = 'foobar';
$function_name(arg1, arg2);
call_user_func_array($function_name, array(arg1, arg2));
If the function you are calling belongs to an object you can still use either of these
$object->$function_name(arg1, arg2);...