大约有 40,000 项符合查询结果（耗时：0.0278秒） [XML]
What do 'real', 'user' and 'sys' mean in the output of time(1)?
... this is only CPU time used by the process. See below for a brief description of kernel mode (also known as 'supervisor' mode) and the system call mechanism.
User+Sys will tell you how much actual CPU time your process used. Note that this is across all CPUs, so if the process has multiple threa...
Split files using tar, gz, zip, or bzip2 [closed]
...
You can use the split command with the -b option:
split -b 1024m file.tar.gz
It can be reassembled on a Windows machine using @Joshua's answer.
copy /b file1 + file2 + file3 + file4 filetogether
Edit: As @Charlie stated in the comment below, you might want to se...
Can I change the size of UIActivityIndicator?
Whatever size i give to it while allocation, it shows fixed size only. Is it possible to increase it?
9 Answers
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How to reload page every 5 seconds?
...s, every time I have to hit F5. Is there any simple javascript/jQuery solution for this? I.e. after I add the script, reload the whole page every 5 seconds (or some other specific time).
...
How do I set up NSZombieEnabled in Xcode 4?
...t zombies:
This Xcode setting is ignored when you archive the application for App Store submission. You don't need to touch anything before releasing your application.
Pressing ⌥⌘R is the same as selecting Product > Run while keeping the Alt key pressed.
Clicking the "Enable Zombie Obj...
jQuery get selected option value (not the text, but the attribute 'value')
...20: Corrected old answer
Use :selected psuedo selector on the selected options and then use the .val function to get the value of the option.
$('select[name=selector] option').filter(':selected').val()
Side note: Using filter is better then using :selected selector directly in the first query.
...
mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
...e allowing reads from a secondary. This is to protect you and your applications from performing eventually consistent reads by accident. You can do this in the shell with:
rs.slaveOk()
After that you can query normally from secondaries.
A note about "eventual consistency": under normal circumst...
Find the number of downloads for a particular app in apple appstore [closed]
...en bought and shut down.
appannie.com and similarweb.com are the best options now. Thanks @rinogo for the original suggestion!
Outdated answer:
Site is still buggy, but this is by far the best that I've found. Not sure if it's accurate, but at least they give you numbers that you can guess off o...
Format numbers to strings in Python
...}:{seconds:02} {"pm" if hours > 12 else "am"}'
or the str.format function starting with 2.7:
"{:02}:{:02}:{:02} {}".format(hours, minutes, seconds, "pm" if hours > 12 else "am")
or the string formatting % operator for even older versions of Python, but see the note in the docs:
"%02d:%02...
Check if a path represents a file or a folder
... // Check if it's a regular file
See File Javadoc
Or you can use the NIO class Files and check things like this:
Path file = new File(path).toPath();
boolean exists = Files.exists(file); // Check if the file exists
boolean isDirectory = Files.isDirectory(file); // Check if it's ...