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How can I check if a file exists in Perl?
... given path using the -e file-test operator.
print "$base_path exists!\n" if -e $base_path;
However, this test is probably broader than you intend. The code above will generate output if a plain file exists at that path, but it will also fire for a directory, a named pipe, a symlink, or a more ex...
how to read System environment variable in Spring applicationContext
...n command line. You can read this property via System.getProperty("prop"). If you would like to read a OS property then use System.getenv("os-env-variable"). See javadoc: docs.oracle.com/javase/6/docs/api/java/lang/System.html
– amra
Jan 20 '14 at 16:54
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How Do I Take a Screen Shot of a UIView?
I am wondering how my iPhone app can take a screen shot of a specific UIView as a UIImage .
15 Answers
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How to convert a string into double and vice versa?
...t = (int)(myDouble + (myDouble>0 ? 0.5 : -0.5))
I'm honestly not sure if there's a more streamlined way to convert back into a string than
NSString* myNewString = [NSString stringWithFormat:@"%d", myInt];
share
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WARNING: Can't verify CSRF token authenticity rails
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As a note, if you are using jQuery UJS as suggested above, you need to ensure that the rails-ujs include comes after the jquery include or it will fail with the same error as the op.
– Topher Fangio
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Array to String PHP?
... This is good unless you have nested arrays - which can happen with $_POST if you're using array-named form inputs.
– Leith
Oct 24 '16 at 4:47
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“Unable to find remote helper for 'https'” during git clone
...ot having (lib)curl-devel installed when you compile git can cause this.
If you install (lib)curl-devel, and then rebuild/install git, this should solve the problem:
$ yum install curl-devel
$ # cd to wherever the source for git is
$ cd /usr/local/src/git-1.7.9
$ ./configure
$ make
$ make insta...
How to find encoding of a file via script on Linux?
...ears to be completely useless for analyzing a file written in English, but if you happen to be looking at something in Estonian, it might solve all your problems. Very helpful tool, that... </sarcasm>
– cbmanica
Apr 16 '13 at 20:36
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Is there a way to get version from package.json in nodejs code?
...n.version);
A warning, courtesy of @Pathogen:
Doing this with Browserify has security implications.
Be careful not to expose your package.json to the client, as it means that all your dependency version numbers, build and test commands and more are sent to the client.
If you're building se...
How do you print out a stack trace to the console/log in Cocoa?
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n13's answer didn't quite work - I modified it slightly to come up with this
#import <UIKit/UIKit.h>
#import "AppDelegate.h"
int main(int argc, char *argv[])
{
@autoreleasepool {
int retval;
@try{
retval = UIApplicationMai...