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Remove blank lines with grep
...rt of line
[[:space:]] match whitespace- spaces, tabs, carriage returns, etc.
* previous match (whitespace) may exist from 0 to infinite times
$ match end of line
Running the code-
$ echo "
> hello
>
> ok" |
> grep -v "^[[:space:]]*$"
hello
ok
To und...
What's the difference between VARCHAR and CHAR?
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@jdc91: in order to have a performance increase the whole row has to be fixed-width. MySQL gains advantage calculating the space requirements and offset of rows in that kind of table.
– Marco Demaio
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IntelliJ IDEA hint parameters of method
...gt; Code Completion -> Autopopup in (ms)
Set it to whatever you like. Etc. 5 ms.
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How to convert currentTimeMillis to a date in Java?
..."real" month as we know it. Example: 0 = January, 1 = February, 2 = March, etc.
– shagberg
Dec 7 '18 at 21:21
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count (non-blank) lines-of-code in bash
... right, which means I usually start with cat, then action, action, action, etc. Clearly, the end result is the same.
– Michael Cramer
Sep 24 '08 at 14:06
32
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Populating a razor dropdownlist from a List in MVC
...option value="2">Second Role</option>
<option value="3">Etc...</option>
</select>
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...t; - is for Page directives, registering assemblies, importing namespaces, etc.
<%= %> - is short-hand for Response.Write (discussed here)
<%# %> - is used for data binding expressions.
<%: %> - is short-hand for Response.Write(Server.HTMLEncode()) ASP.net 4.0+
<%#: %> - is u...
Best way to create an empty object in JSON with PHP?
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Well, json_encode() simply returns a string from a PHP array/object/etc. You can achieve the same effect much more efficiently by doing:
$json = '{}';
There's really no point in using a function to accomplish this.
UPDATE
As per your comment updates, you could try:
$test = json_encode(ar...
PostgreSQL ERROR: canceling statement due to conflict with recovery
...ndby_archive_delay and max_standby_streaming_delay to some sane value:
# /etc/postgresql/10/main/postgresql.conf on a slave
max_standby_archive_delay = 900s
max_standby_streaming_delay = 900s
This way queries on slaves with a duration less than 900 seconds won't be cancelled. If your workload req...
SSL handshake alert: unrecognized_name error since upgrade to Java 1.7.0
...etting this flag is that SNI is disabled everywhere in the application. In order to make use of SNI and still support misconfigured servers:
Create a SSLSocket with the host name you want to connect to. Let's name this sslsock.
Try to run sslsock.startHandshake(). This will block until it is done ...