大约有 15,461 项符合查询结果（耗时：0.0244秒） [XML]
How can you run a command in bash over until success
...
You need to test $? instead, which is the exit status of the previous command. passwd exits with 0 if everything worked ok, and non-zero if the passwd change failed (wrong password, password mismatch, etc...)
passwd
while [ $? -ne 0 ]; ...
Performance of Java matrix math libraries? [closed]
...range of operations, there are a few clear leaders as can be seen in the latest performance results (October 2013).
If you are working with "large" matrices and can use native libraries, then the clear winner (about 3.5x faster) is MTJ with system optimised netlib. If you need a pure Java solution ...
How to base64 encode image in linux bash / shell
...ntents of the file named 'DSC_0251.JPG', rather than the filename itself.
test="$(cat DSC_0251.JPG | base64)"
However, base64 can read from the file itself:
test=$( base64 DSC_0251.JPG )
share
|
...
JavaScript, elegant way to check nested object properties for null/undefined [duplicate]
... may return a property from anywhere in the chain, it doesn't specifically test for the last property.
– RobG
May 22 '14 at 14:21
2
...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
... -s core can be used to dump memory in bulk
Now for the full educational test setup:
main.c
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int myfunc(int i) {
*(int*)(NULL) = i; /* line 7 */
return i - 1;
}
int main(int argc, char...
Terminating a script in PowerShell
...to the conflicting information. Ultimately I always have to perform my own tests to figure it out. So this time I will post my findings.
TL;DR Most people will want to use Exit to terminate a running scripts. However, if your script is merely declaring functions to later be used in a shell, then yo...
Finding JavaScript memory leaks with Chrome
I've created a very simple test case that creates a Backbone view, attaches a handler to an event, and instantiates a user-defined class. I believe that by clicking the "Remove" button in this sample, everything will be cleaned up and there should be no memory leaks.
...
Adding hours to JavaScript Date object?
...s= function(h){
this.setHours(this.getHours()+h);
return this;
}
Test:
alert(new Date().addHours(4));
share
|
improve this answer
|
follow
|
...
How to get image height and width using java?
... quick as only image size is read from the file and not the whole image. I tested it and there is no comparison to ImageIO.read performance. I hope someone will find this useful.
share
|
improve thi...
Is there a sleep function in JavaScript? [duplicate]
...ly different from how sleep method, if it existed, would behave.
function test1()
{
// let's say JavaScript did have a sleep function..
// sleep for 3 seconds
sleep(3000);
alert('hi');
}
If you run the above function, you will have to wait for 3 seconds (sleep method call is...