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How to break out from a ruby block?
...ator that invoked the block, and to the first expression following the invocation of the iterator:
f.each do |line| # Iterate over the lines in file f
break if line == "quit\n" # If this break statement is executed...
puts eval(line)
end
puts "Good bye" # ...then contr...
What is “Orthogonality”?
... not have side effects; each action (whether it's an API call, a macro invocation, or a language operation) changes just one thing without affecting others. There is one and only one way to change each property of whatever system you are controlling.
...
How to redirect 404 errors to a page in ExpressJS?
...st:3000/notfound
// $ curl http://localhost:3000/notfound -H "Accept: application/json"
// $ curl http://localhost:3000/notfound -H "Accept: text/plain"
app.use(function(req, res, next){
res.status(404);
// respond with html page
if (req.accepts('html')) {
res.render('404', { url: req.ur...
Semicolon before self-invoking function? [duplicate]
...
If you concatenate two files with self-invoking functions together that look like this:
File A:
(function(){...A...})()
File B:
(function(){...B...})()
File A+B:
(function(){...A...})()(function(){...B...})()
You have two sta...
How do I return to an older version of our code in Subversion?
...
svn doesn't interpret it as a modification, I can't commit that.
– Sandburg
Nov 27 '18 at 15:24
...
How do I restrict a float value to only two places after the decimal point in C?
...ree different rounding rules you might want to choose: round down (ie, truncate after two decimal places), rounded to nearest, and round up. Usually, you want round to nearest.
As several others have pointed out, due to the quirks of floating point representation, these rounded values may not be e...
Force line-buffering of stdout when piping to tee
...responding settings changed by 'stdbuf'.
Also some filters (like 'dd' and 'cat' etc.) dont use streams for I/O,
and are thus unaffected by 'stdbuf' settings.
you are not running stdbuf on tee, you're running it on a, so this shouldn't affect you, unless you set the buffering of a's streams in a's ...
find: missing argument to -exec
...nd line, so it might be split up) with all filenames. See this example:
$ cat /tmp/echoargs
#!/bin/sh
echo $1 - $2 - $3
$ find /tmp/foo -exec /tmp/echoargs {} \;
/tmp/foo - -
/tmp/foo/one - -
/tmp/foo/two - -
$ find /tmp/foo -exec /tmp/echoargs {} +
/tmp/foo - /tmp/foo/one - /tmp/foo/two
Your com...
Use space as a delimiter with cut command
...y shows an option with a mandatory option-argument [...] a conforming application shall use separate arguments for that option and its option-argument. However, a conforming implementation shall also permit applications to specify the option and option-argument in the same argument string without in...
How to prettyprint a JSON file?
...ting is ok, but if you want to manipulate the json it can become overcomplicated. You'd soon need to write a separate script-file, you could end up with maps whose keys are u"some-key" (python unicode), which makes selecting fields more difficult and doesn't really go in the direction of pretty-prin...