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What's the purpose of META-INF?
...clude with your JAR should be placed in some other sub-directory or at the root of the JAR itself.
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Controlling a USB power supply (on/off) with Linux
...n foo using sudo. The redirection fails because it happens before you get root access. The solution is to use sudo sh -c 'echo disabled > /sys/bus/usb/devices/usb1/power/wakeup', and so on: gain root, run a new hell to perform a redirect, then output something into the redirected file descripto...
Total memory used by Python process?
...nt sum " KB"}'
90064 KB
Attach my process list.
$ ps aux | grep python
root 943 0.0 0.1 53252 9524 ? Ss Aug19 52:01 /usr/bin/python /usr/local/bin/beaver -c /etc/beaver/beaver.conf -l /var/log/beaver.log -P /var/run/beaver.pid
root 950 0.6 0.4 299680 34220 ? Sl...
Find all storage devices attached to a Linux machine [closed]
...setups such as EC2 xvda devices.
Here is a dump for a m1.large instance:
root@ip-10-126-247-82:~# fdisk -l
Disk /dev/xvda1: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders, total 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 byt...
Allowed characters in Linux environment variable names
...n/sh}
Verify environment variables:
HOSTNAME=bd0bccfdc53b
SHLVL=2
HOME=/root
spring.application_name=happy-variable-name
TERM=xterm
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
Use ps aux to verify PID not changed
PID USER TIME COMMAND
1 root 0:00 /bi...
What is the difference between window, screen, and document in Javascript?
...
Window is the main JavaScript object root, aka the global object in a browser, also can be treated as the root of the document object model. You can access it as window
window.screen or just screen is a small information object about physical screen dimensions...
译文:理解Java中的弱引用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...方面的专家,但是我认为至少你应该了解什么是弱引用,如何使用它们,并且什么场景使用。既然它们是一些不知名的概念,我简单就着前面的三个问题来说明一下。
强引用(Strong Reference)
强引用就是我们经常使用的引用,其...
Passing references to pointers in C++
... to a pointer to make all the pointers in a deleted binary tree except the root safe. To make the pointer safe we just have to set it to 0. I could not make the function that deletes the tree (keeping only the root) to accept a ref to a pointer since I am using the root (this pointer) as the first i...
Why does gulp.src not like being passed an array of complete paths to files?
...each file is processed independently. The globbing doesn't know where the root of the path is (in fact, it guesses based on the first glob). Therefore, each file is rooted in the folder it contains, and the relative path is empty.
However, there is an easy solution. Pass an object with the key b...
How to create .pfx file from certificate and private key?
...e key file is just a text file with your private key in it.
If you have a root CA and intermediate certs, then include them as well using multiple -in params
openssl pkcs12 -export -out domain.name.pfx -inkey domain.name.key -in domain.name.crt -in intermediate.crt -in rootca.crt
You can install ...
