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Bash/sh - difference between && and ;
I normally use ; to combine more than one command in a line, but some people prefer && . Is there any difference? For example, cd ~; cd - and cd ~ && cd - seems to make the same thing. What version is more portable, e.g. will be supported by a bash-subset like Android's shell ...
In Vim, how do I delete everything within the double quotes?
...een the quotes flowed over two lines. I had to resize the window so it was all on one line. Then it worked fine.
– nulluser
Dec 6 '13 at 19:56
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shortcut for creating a Map from a List in groovy?
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Check out "inject". Real functional programming wonks call it "fold".
columns.inject([:]) { memo, entry ->
memo[entry.name] = entry.val
return memo
}
And, while you're at it, you probably want to define methods as Categories instead of right on the metaClass. That ...
Is there an alternative to string.Replace that is case-insensitive?
I need to search a string and replace all occurrences of %FirstName% and %PolicyAmount% with a value pulled from a database. The problem is the capitalization of FirstName varies. That prevents me from using the String.Replace() method. I've seen web pages on the subject that suggest
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How to open emacs inside bash
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Thanks, Tikhon! That's been pissing me off all day :P
– speeves
Jan 5 '12 at 23:27
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How to count occurrences of a column value efficiently in SQL?
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If you're using Oracle, then a feature called analytics will do the trick. It looks like this:
select id, age, count(*) over (partition by age) from students;
If you aren't using Oracle, then you'll need to join back to the counts:
select a.id, a.age, b.age_co...
When to use the brace-enclosed initializer?
...py (=) initialization (because then in case of error, you'll never accidentally invoke an explicit constructor, which generally interprets the provided value differently). In places where copy initialization is not available, see if brace initialization has the correct semantics, and if so, use that...
How to do ssh with a timeout in a script?
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This doesn't actually work for "the remote host is taking an infinite time to run": "ssh -o ConnectTimeout=5 host 'sleep 10'" waits for 10 seconds, not 5.
– Ferry Boender
Oct 11 '16 at 18:37
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Using Node.js only vs. using Node.js with Apache/Nginx
...vileges/setuid for the Node.js process. Only root can bind to port 80 typically. If you let nginx/Apache worry about starting as root, binding to port 80, and then relinquishing its root privileges, it means your Node app doesn't have to worry about it.
Serving static files like images, css, js, and...
A good solution for await in try/catch/finally?
I need to call an async method in a catch block before throwing again the exception (with its stack trace) like this :
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