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What does set -e mean in a bash script?
... pipeline still run, even with set -o errexit. For example: echo success | cat - <(echo piping); echo continues, where echo success represents a successful, but fallible command, will print success, piping, and continues, but false | cat - <(echo piping); echo continues, with false representin...
Most efficient method to groupby on an array of objects
...// example usage
const pets = [
{type:"Dog", name:"Spot"},
{type:"Cat", name:"Tiger"},
{type:"Dog", name:"Rover"},
{type:"Cat", name:"Leo"}
];
const grouped = groupBy(pets, pet => pet.type);
console.log(grouped.get("Dog")); // -> [{type:"Dog", name:"Spot"}, {type:"D...
jQuery set checkbox checked
... to the conversation.
Here is the longhand code for a fullcalendar modification that says if the retrieved value "allDay" is true, then check the checkbox with ID "even_allday_yn":
if (allDay)
{
$( "#even_allday_yn").prop('checked', true);
}
else
{
$( "#even_allday_yn").prop('checked', fa...
Best practices with STDIN in Ruby?
...e Ruby.
So, in Ruby, a simple no-bells implementation of the Unix command cat would be:
#!/usr/bin/env ruby
puts ARGF.read
ARGF is your friend when it comes to input; it is a virtual file that gets all input from named files or all from STDIN.
ARGF.each_with_index do |line, idx|
print ARGF....
How to add \newpage in Rmarkdown in a smart way?
...elcome! You have already accepted the answer (green mark); that is the indication that the problem is solved. It is enough for this question, though other users may still add their answers or comments. Here on SO closing questions is a vote-based tool that locks not-so-good questions or even deletes...
Cluster analysis in R: determine the optimal number of clusters
.../cluster.html & http://www.mattpeeples.net/kmeans.html for more. The location of the elbow in the resulting plot suggests a suitable number of clusters for the kmeans:
mydata <- d
wss <- (nrow(mydata)-1)*sum(apply(mydata,2,var))
for (i in 2:15) wss[i] <- sum(kmeans(mydata,
...
How to copy a file to multiple directories using the gnu cp command
...hat involve using other tools or constructs to do that, but the OP did indicate he was already aware that is possible.
– moonshadow
Feb 3 '13 at 22:38
...
Best way to simulate “group by” from bash?
...
The quick and dirty method is as follows:
cat ip_addresses | sort -n | uniq -c
If you need to use the values in bash you can assign the whole command to a bash variable and then loop through the results.
PS
If the sort command is omitted, you will not get the corr...
How does the vim “write with sudo” trick work?
...bstitute a shell command to receive the buffer contents. For instance, :w !cat will just display the contents.
If Vim wasn't run with sudo access, its :w can't modify a protected file, but if it passes the buffer contents to the shell, a command in the shell can be run with sudo. In this case, we u...
How can I shuffle the lines of a text file on the Unix command line or in a shell script?
...eir hash value.
[Editor's note: sort -R almost shuffles, except that duplicate lines / sort keys always end up next to each other. In other words: only with unique input lines / keys is it a true shuffle. While it's true that the output order is determined by hash values, the randomness comes from ...