大约有 44,000 项符合查询结果（耗时：0.0658秒） [XML]
How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess
...and with $! you get the PID of the last command launched in background.
Modify the loop to store the PID of each spawned sub-process into an array, and then loop again waiting on each PID.
# run processes and store pids in array
for i in $n_procs; do
./procs[${i}] &
pids[${i}]=$!
done
...
Why check both isset() and !empty()
Is there a difference between isset and !empty . If I do this double boolean check, is it correct this way or redundant? and is there a shorter way to do the same thing?
...
Android: I am unable to have ViewPager WRAP_CONTENT
...measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
int h = child.getMeasuredHeight();
if(h > height) height = h;
}
if (height != 0) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
}
super.on...
How do I force files to open in the browser instead of downloading (PDF)?
...ent; filename="filename.pdf"
The quotes around the filename are required if the filename contains special characters such as filename[1].pdf which may otherwise break the browser's ability to handle the response.
How you set the HTTP response headers will depend on your HTTP server (or, if you ar...
What's the scope of the “using” declaration in C++?
...
But if you put the using declaration inside a namespace it's limited to the scope of that namespace, so is generally OK (with the usual caveats on your particular needs and style).
– Zero
De...
Detect the Enter key in a text input field
I'm trying to do a function if enter is pressed while on specific input.
10 Answers
10...
How can I delete all unversioned/ignored files/folders in my working copy?
If I have a working copy of a Subversion repository, is there a way to delete all unversioned or ignored files in that working copy with a single command or tool? Essentially, I'm looking for the SVN analogue to git clean .
...
How to check if a word is an English word with Python?
I want to check in a Python program if a word is in the English dictionary.
9 Answers
...
How to organize large R programs?
...swer is to use packages -- see the Writing R Extensions manual as well as different tutorials on the web.
It gives you
a quasi-automatic way to organize your code by topic
strongly encourages you to write a help file, making you think about the interface
a lot of sanity checks via R CMD check
a ...
Bash script error [: !=: unary operator expected
In my script I am trying to error check if the first and only argument is equal to -v but it is an optional argument. I use an if statement but I keep getting the unary operator expected error.
...