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ruby system command check exit code
...=> true
system("echo foo | grep bar") #=> false
Furthermore
An error status is available in $?.
system("VBoxManage createvm --invalid-option")
$? #=> #<Process::Status: pid 9926 exit 2>
$?.exitstatus #=> 2
...
自动生成Linux下Makefile全攻略（automake原理） - C/C++ - 清泛网 - 专注C/C++及内核技术
... off warnings in CATEGORY
`none' turn off all the warnings
`error' treat warnings as errors
Files which are automatically distributed, if found:
ABOUT-GNU README config.rpath ltcf-gcj.sh
ABOUT-NLS THANKS config.sub ...
How to set environment variables in Python?
...EBUSSY'] = str(myintvariable)
then for retrieval, consider that to avoid errors, you should try
os.environ.get('DEBUSSY', 'Not Set')
possibly substitute '-1' for 'Not Set'
so, to put that all together
myintvariable = 1
os.environ['DEBUSSY'] = str(myintvariable)
strauss = int(os.environ.get('S...
How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)
...
I tried it but again getting same error Error: The brew link step did not complete successfully
– Chandni
Jul 20 '18 at 2:54
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Selenium wait until document is ready
... I tried this idea in a VB test app. Works most of the time. I get this error sometimes: System.InvalidOperationException : JavaScript error (UnexpectedJavaScriptError) at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse) Test app clicks on level 2 menu link,...
Passing Data between View Controllers
...ControllerB that ViewControllerA is its delegate, otherwise we will get an error.
ViewControllerB *viewControllerB = [[ViewControllerB alloc] initWithNib:@"ViewControllerB" bundle:nil];
viewControllerB.delegate = self
[[self navigationController] pushViewController:viewControllerB animated:YES];
...
Abort a git cherry-pick?
...
yes, this doesn't work. Most of the times I get this error: Entry '<unstaged file>' not uptodate. Cannot merge. On the other hand, git reset --merge does work!
– kumarharsh
Jun 4 '14 at 12:02
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LINQ to Entities does not recognize the method
I'm getting the following error when trying to do a linq query:
4 Answers
4
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Circular (or cyclic) imports in Python
...y. He does not use from x import y, and yet still gets the circular import error
– Greg Ennis
Jun 30 '14 at 14:09
2
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@UniqueConstraint annotation in Java
...nnotating multiple unique keys at the table level, which is why you get an error when applying it to a field.
References (JPA TopLink):
@UniqueConstraint
@Column
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