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Ruby on Rails console is hanging when loading
...version you originally specified (which you know your app works in) at any time.
– Ben Aubin
Aug 4 '16 at 23:09
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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
... (say) it says out of memory with 32 GB RAM. 2) I also see HTML takes some time to write, can the same output be sent to TEXT file?
– Deep
Feb 13 '19 at 6:44
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How do I kill background processes / jobs when my shell script exits?
I am looking for a way to clean up the mess when my top-level script exits.
13 Answers
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How to track child process using strace?
I used strace to attach to a process briefly. The process created 90 threads. When I found the offending thread, I had to tediously search for the parent thread, then the grandparent thread, and so on all the way to the root process.
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What's the difference between OpenID and OAuth?
...D does not require hard coding each the providers you want to use ahead of time. Using discovery, the user can choose any third-party provider they want to authenticate. This discovery feature has also caused most of OpenID's problems because the way it is implemented is by using HTTP URIs as identi...
(grep) Regex to match non-ASCII characters?
On Linux, I have a directory with lots of files. Some of them have non-ASCII characters, but they are all valid UTF-8 . One program has a bug that prevents it working with non-ASCII filenames, and I have to find out how many are affected. I was going to do this with find and then do a grep to p...
Check if string contains only whitespace
How can I test if a string contains only whitespace?
11 Answers
11
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How do I copy to the clipboard in JavaScript?
...pening windows).
Internet Explorer will show a permission dialog the first time the clipboard is updated.
Internet Explorer, and Edge will scroll when the textarea is focused.
execCommand() may throw in some cases.
Newlines and tabs can get swallowed unless you use a textarea. (Most articles seem to...
Find rows with multiple duplicate fields with Active Record, Rails & Postgres
...; 1")
Also, this is a little unrelated but handy. If you want to see how times each combination was found, put .size at the end:
User.select(:first,:email).group(:first,:email).having("count(*) > 1").size
and you'll get a result set back that looks like this:
{[nil, nil]=>512,
["Joe", "...
How to apply unmerged upstream pull requests from other forks into my fork?
...kub said previously, you can just pull the branch in directly. Most of the time with GitHub, the branch is simply "master" on the requesting User's fork of the project.
Example: git pull https://github.com/USER/PROJECT/ BRANCH
And as a pratical example:
Say you forked a github project called safa...