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Delete all lines beginning with a # from a file
...t leaves empty lines).
A line starting with arbitrary whitespace followed by # might also be treated as a comment:
grep -v '^ *#' filename
if whitespace is only spaces, or
grep -v '^[ ]#' filename
where the two spaces are actually a space followed by a literal tab character (type "control-v ...
Round a double to 2 decimal places [duplicate]
..., with cleaner code too.
So, use this instead
(Adapted from this answer by Louis Wasserman and this one by Sean Owen.)
public static double round(double value, int places) {
if (places < 0) throw new IllegalArgumentException();
BigDecimal bd = BigDecimal.valueOf(value);
bd = bd.s...
Correct mime type for .mp4
...-Type for MPEG-4 video.
Generally, you can find official MIME definitions by searching for the file extension and "IETF" or "RFC". The RFC (Request for Comments) articles published by the IETF (Internet Engineering Taskforce) define many Internet standards, including MIME types.
...
Spring MVC: Complex object as GET @RequestParam
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Note that Spring by default requiers getters/setters for the MyObject to bind it automatically. Otherway it won't bind the myObject.
– aka_sh
Dec 31 '14 at 14:29
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“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
...o a partition.
If you use REPLACE, MySQL actually does a DELETE followed by an INSERT internally, which has some unexpected side effects:
A new auto-increment ID is allocated.
Dependent rows with foreign keys may be deleted (if you use cascading foreign keys) or else prevent the REPLACE.
Trigg...
Using msbuild to execute a File System Publish Profile
...nd the scenes the Web.config transformation and
package building is done by a massive MSBuild script that’s imported
into your project file (found at: C:\Program Files
(x86)\MSBuild\Microsoft\VisualStudio\v10.0\Web\Microsoft.Web.Publishing.targets).
Unfortunately, the script is hugely comp...
What does the “map” method do in Ruby?
...anil', 'edmund']
# here we map one array to another, convert each element by some rule
names.map! {|name| name.capitalize } # now names contains ['Danil', 'Edmund']
names.each { |name| puts name + ' is a programmer' } # here we just do something with each element
The output:
Danil is a programm...
create two method for same url pattern with different arguments
...
You can use the params parameter to filter by HTTP parameters. In your case it would be something like:
@RequestMapping(value = "/searchUser", params = "userID")
public String searchUserById(@RequestParam long userID, Model model) {
// ...
}
@RequestMapping(value ...
How to copy data to clipboard in C#
...ace declaration, make sure Main is marked with [STAThread] attribute. Step-by-step guide in another answer
using System.Windows.Forms;
To copy an exact string (literal in this case):
Clipboard.SetText("Hello, clipboard");
To copy the contents of a textbox either use TextBox.Copy() or get text...
What does the caret operator (^) in Python do?
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I wanted to add, you can do binary numbers by typing 0bX where X is your binary. 0b0001, 0b0010, etc. So, 0b1101 ^ 0b1110 would give you 0b0011 (or 3).
– Jeff
Jul 28 '15 at 23:58
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