command-line

问题 I have some trouble to execute a Python file from a Codeigniter controller's function. ~/application/controllers/Lights.php : header("Access-Control-Allow-Origin: *"); class Lights extends CI_Controller { public function __construct() { parent::__construct (); $this->load->helper ( array ('url', 'form') ); } public function turnOn() { system('sudo python test.py > /dev/null 2>/dev/null &'); } } but when I try to execute a system call, like : system("sudo gpio mode 15 out"); this works

问题 I have some trouble to execute a Python file from a Codeigniter controller's function. ~/application/controllers/Lights.php : header("Access-Control-Allow-Origin: *"); class Lights extends CI_Controller { public function __construct() { parent::__construct (); $this->load->helper ( array ('url', 'form') ); } public function turnOn() { system('sudo python test.py > /dev/null 2>/dev/null &'); } } but when I try to execute a system call, like : system("sudo gpio mode 15 out"); this works

问题 Is there any way to append to a file on HDFS from command line like copying file: hadoop fs -copyFromLocal <localsrc> URI 回答1: This feature is implemented in Hadoop 2.3.0 as appendToFile with a syntax like: hdfs dfs -appendToFile localfile /user/hadoop/hadoopfile (it was first suggested in 2009 when the HDFS Append feature was being contemplated: https://issues.apache.org/jira/browse/HADOOP-6239 ) 回答2: cli doesn't support append, but httpfs and fuse both has support for appending files. w301%

问题 Is there any way to append to a file on HDFS from command line like copying file: hadoop fs -copyFromLocal <localsrc> URI 回答1: This feature is implemented in Hadoop 2.3.0 as appendToFile with a syntax like: hdfs dfs -appendToFile localfile /user/hadoop/hadoopfile (it was first suggested in 2009 when the HDFS Append feature was being contemplated: https://issues.apache.org/jira/browse/HADOOP-6239 ) 回答2: cli doesn't support append, but httpfs and fuse both has support for appending files. w301%

问题 My questions is one that I haven't seen answered, the usual question is how to run certain commands to a file. My question is how to run Vim commands or functions, from outside Vim (i.e. Terminal), these wouldn't affect any file, just Vim itself. Is this is even possible? If so, how? If this is not possible like this, is there a way to go into Vim, run a command automatically, and then exit when that ends? Or run another command and then exit? Thanks for your help! 回答1: Use vim --cmd 'Command

问题 I'm trying to code a printer automation using Python on Windows, but can't get it done. I'm not really understanding the topic and i'm a little surprised - a "simple" way to get this done doesn't seem to exist..? There are so many APIs that allow to access common things in a nice and easy way, but printing seems to be something "special"..? Here is what i have and what i want to do: There is a PDF file. The PDF already exists, i do not want to create PDFs or any other filetype. I like to

问题 For Android there is ADB (Android debug bridge) which allows to get a shell on the connected device: adb shell Is there something similar for iOS? I'd like to type some shell commands on my Mac that would be executed on the connected iPhone. Is there a built-in Terminal on iPhone? 回答1: There isn't anything for it built in, but if you are jailbroken or can sideload apps (a.k.a., you have a mac with XCode), you can run a local terminal with apps like MobileTerminal, which aren't available on

问题 This may not be the most thought provoking question, but nevertheless has struck my curiosity. I have not been able to come across any answer (let alone a definitive one) on the web. While reading Advanced Shell Scripting, I came across this section regarding command line positional arguments which states that anything after the the ninth argument must be surrounded by ${} (the longer form of variable referencing/substitution). Simply put, why must you reference command line argument ten (and

问题 I get the following warning: warning: 'X' is initialized and declared 'extern' and it looks like it's no big deal and I could disable it. Changing the code is not really a good idea in my case because I have no control over the code, I just need to compile it. So I want to disable the warning. If it had a -WSomeDefect key next to it then I could use a -Wno-SomeDefect command line switch but it looks like there's no distinct switch for this warning. How do I disable such warning? 回答1: For a

问题 I want to know if it is possible to retrieve the now playing info (name of file, time elapsed, etc.) for VLC from the command line. I want to then use Java to use this info somewhere. One possibility might be to use JNA, but not sure how that would work. I searched everywhere but it only tells me how to start a file from command line. 回答1: Apparently VLC comes with a small Http server which can be used to send commands to the player. You launch the server by issuing % vlc -I http (--http-src