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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...
Questions every good .NET developer should be able to answer? [closed]
...nstances on this site where people are trying to roll their own version of Union Distinct and Concat for collections because they don't understand LINQ.
– Evan Plaice
Jun 19 '10 at 1:04
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What is the difference between window, screen, and document in Javascript?
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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...
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...
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...
Retrieve the maximum length of a VARCHAR column in SQL Server
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for mysql its length not len
SELECT MAX(LENGTH(Desc)) FROM table_name
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How to print SQL statement in codeigniter model
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Fatal error: Call to undefined method CI_DB_mysql_driver::get_compiled_select()
– itskawsar
Sep 25 '13 at 8:53
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Left Join With Where Clause
...worry about JOIN/WHERE in the main query.
Sometimes, this works faster in MySQL, but compare it against the LEFT JOIN form to see what works best for you.
SELECT s.*, c.value
FROM settings s
LEFT JOIN character_settings c ON c.setting_id = s.id AND c.character_id = '1'
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Generating Guids in Ruby
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To create a proper, mysql, varchar 32 GUID
SecureRandom.uuid.gsub('-','').upcase
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