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What are the uses of the exec command in shell scripts? [closed]
...a different shell to the one in /etc/passwd. Stupid as it may seem, some sites do not allow users to alter their sign-in shell. One site I know had everyone start with csh, and everyone just put into their .login (csh start-up file) a call to ksh. While that worked, it left a stray csh process r...
Referencing another schema in Mongoose
...ake your query, you can populate references like this:
Post.findOne({_id: 123})
.populate('postedBy')
.exec(function(err, post) {
// do stuff with post
});
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...
Automatically create an Enum based on values in a database lookup table?
...way of defining integer constants (even if System.Enum has some additional functionality). Instead of writing const int Red=0, Green=1, Blue=3; You write enum { Red, Green, Blue }. A constant is by definition constant and not dynamic.
– Olivier Jacot-Descombes
...
Ruby combining an array into one string
...
what if you were joining digits? [1,2,3] => 123?
– stevenspiel
Dec 9 '13 at 19:08
3
...
.gitignore and “The following untracked working tree files would be overwritten by checkout”
... I thought it would only remove it from git.
– tyegah123
Sep 29 '14 at 8:37
25
The -x option hurt...
Hashing a string with Sha256
...u don't use the same string encoding. The link you put for the on-line web site that computes SHA256 uses UTF8 Encoding, while in your example you used Unicode Encoding. They are two different encodings, so you don't get the same result. With the example above you get the same SHA256 hash of the lin...
Calling a parent window function from an iframe
... a specific target discloses the data you send to any interested malicious site (comment by ZalemCitizen).
References:
Cross-document messaging
Window.postMessage()
Can I Use
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filter for complete cases in data.frame using dplyr (case-wise deletion)
... passing it to the filter.
Another benchmark with more columns:
set.seed(123)
x <- sample(1e5,1e5*26, replace = TRUE)
x[sample(seq_along(x), 1e3)] <- NA
df <- as.data.frame(matrix(x, ncol = 26))
library(microbenchmark)
microbenchmark(
na.omit = {df %>% na.omit},
filter.anonymous = ...
How do you make sure email you send programmatically is not automatically marked as spam?
...e belong together, and to prevent spoofing of your domain name. The SPF website includes a wizard to generate the DNS information for your site.
Check your reverse DNS to make sure the IP address of your mail server points to the domain name that you use for sending mail.
Make sure that the IP-add...
This Handler class should be static or leaks might occur: IncomingHandler
...lass implements MessageHandler {
private static final int DO_IT_MSG = 123;
private MainThreadHandler<MyClass> mHandler = new MainThreadHandler<>(this);
private void start() {
// Do it in 5 seconds.
mHandler.sendEmptyMessageDelayed(DO_IT_MSG, 5 * 1000);
...