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What is /dev/null 2>&1?
...Command ls -l /dev/null will give you details of this file:
crw-rw-rw-. 1 root root 1, 3 Mar 20 18:37 /dev/null
Did you observe crw? Which means it is a pseudo-device file which is of character-special-file type that provides serial access.
/dev/null accepts and discards all input; produces n...
How do I mock a service that returns promise in AngularJS Jasmine unit test?
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@JimAho Typically you just inject $rootScope and call $digest on that.
– dnc253
May 18 '15 at 15:39
1
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What is the advantage of using heredoc in PHP? [closed]
...ot use double quotes within there in the first place. That only works with MySQL, and only when that server doesn't run in --ansi compliant mode. SQL strings must use single quotes.
– mario
Apr 15 '11 at 7:27
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Can I bind an array to an IN() condition?
...x in a table, and it is still not implemented yet - see this record in the MYSQL bug tracker. Thanks to @BillKarwin for the notice.
You can't use a string with comma inside as a value of the array for search. It is impossible to parse such string in the right way after implode since you use comma sy...
Migration: Cannot add foreign key constraint
... $table->engine = 'InnoDB'; is required to enforce foreign key at MySql level. The default laravel engine is MyIsam wich not support foreign keys !
– François Breton
Oct 9 '15 at 18:16
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How can I Remove .DS_Store files from a Git repository?
...ates the file if not present, this command should be executed from project root folder
– Saif
Aug 2 '17 at 7:44
@Saif ...
How do I test a file upload in rails?
...ctionDispatch::Http::UploadedFile.new({
:tempfile => File.new(Rails.root.join("test/fixtures/files/test.jpg"))
})
assert model.valid?
This way you can use the same methods you are using in your validations (as for example tempfile).
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java.lang.OutOfMemoryError: Java heap space
...in your application
If you find memory leaks in your application, find the root cause with help of profiling tools like MAT, Visual VM , jconsole etc. Once you find the root cause, fix the leaks.
Important notes from oracle article
Cause: The detail message Java heap space indicates object cou...
How to copy in bash all directory and files recursive?
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So, to clarify, capital -R option will copy the root dir again; small -r option keeps the root paths the same.
– AnneTheAgile
Aug 7 '14 at 13:27
8
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How to set environment variable for everyone under my linux system?
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Scripts are not used for ROOT user.
– Val
Jul 26 '14 at 7:36
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