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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
...te easily handle empty strings. If that's what you want then you don't actually need the -z non-empty check:
pax> VAR=xyzzy
pax> if [[ -e $VAR ]] ; then echo yes ; fi
pax> VAR=/tmp
pax> if [[ -e $VAR ]] ; then echo yes ; fi
yes
In other words, just use:
if [[ -e "$var" ]] ; then
...
How can I manipulate the strip text of facet_grid plots?
...ts. My question
is similar to a question on plot titles , but I'm specifically concerned with
manipulating not the plot title but the text that appears in facet titles (strip_h).
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How to keep the local file or the remote file during merge using Git and the command line?
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This approach seems more straightforward, avoiding the need to individually select each file:
# keep remote files
git merge --strategy-option theirs
# keep local files
git merge --strategy-option ours
or
# keep remote files
git pull -Xtheirs
# keep local files
git pull -Xours
Copied direct...
Error: Can't set headers after they are sent to the client
...) {
if (err) {
res.send(err);
} else {
User.findOneAndUpdate({ _id: req.user._id }, { $push: { article: doc._id } })
.exec(function(err, doc2) {
if (err) res.send(err);
else res.json(doc2); // Will be called second.
})
res.json(doc1); // Will be ...
REST API Best practice: How to accept list of parameter values as input [closed]
...
A Step Back
First and foremost, REST describes a URI as a universally unique ID. Far too many people get caught up on the structure of URIs and which URIs are more "restful" than others. This argument is as ludicrous as saying naming someone "Bob" is better than naming him "Joe" – both...
Hidden Features of MySQL
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Since you put up a bounty, I'll share my hard won secrets...
In general, all the SQLs I tuned today required using sub-queries. Having come from Oracle database world, things I took for granted weren’t working the same with MySQL. And my reading on MySQL tuning makes me conclude that MySQL is be...
How do I create a random alpha-numeric string in C++?
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C++11 allows you to separate the generator from the engine, but what is best depends on what the needs of your application are. This is why my first snippet uses rand and the second does not.
– Carl
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Evil Mode best practice? [closed]
...ided that it meets my demand for speedy movement well enough that I can finally move on to Emacs.
7 Answers
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How to use glOrtho() in OpenGL?
...ou specify a Z value for your vertex's position, it will be clipped if it falls outside that range. Otherwise if it's inside that range, it will appear to have no effect on the position except for Z tests.
share
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How to get share counts using graph API
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How much is the API call limit for each request?
– StErMi
Dec 9 '14 at 16:53
8
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