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How to achieve code folding effects in Emacs?
...
Another way to skin the cat:
As it happens, you don’t need any package or extra configuration for
that. Just go to any source file, type
M-1 C-x $ and magic happens!
As usual, it’s white magic: C-x $ will bring your code back.
We c...
Calling JMX MBean method from a shell script
...read an attribute:
me@oddjob:jmx$ cd log4j/root/attributes
me@oddjob:jmx$ cat priority
to write an attribute:
me@oddjob:jmx$ echo "WARN" > priority
to invoke an operation:
me@oddjob:jmx$ cd Catalina/none/none/WebModule/localhost/helloworld/operations/addParameter
me@oddjob:jmx$ echo "myPar...
How do I determine k when using k-means clustering?
...t Bischof, Ales Leonardis, and Alexander Selb in Pattern Analysis and Applications vol. 2, p. 59-72, 1999.
Finally, you can start with one cluster, then keep splitting clusters until the points assigned to each cluster have a Gaussian distribution. In "Learning the k in k-means" (NIPS 2003), Greg ...
How to capture Curl output to a file?
...uld in most cases prefer curl http://example.com -o example_com.html & cat example_com.html | pbcopy So you wouldn't need to curl again if you accidently clear your clipboard.
– lacostenycoder
Dec 4 '19 at 10:38
...
Postgres - FATAL: database files are incompatible with server
...r/pgsql_socket/.s.PGSQL.5432"?
Okay, lets take a look into server logs:
cat /usr/local/var/postgres/server.log
FATAL: database files are incompatible with server
DETAIL: The data directory was initialized by PostgreSQL version 9.2, which is not compatible with this version 9.3.5.
So, we need t...
Shell command to sum integers, one per line?
...rote a rudimentary mailing list processer with an awk script run via the vacation utility. Good times. :)
– L S
Mar 7 '12 at 16:05
2
...
How to set environment variable for everyone under my linux system?
...orn shell also read /etc/profile - it is probably the mostly widely used location for system environment setting. Some versions of the C shell look in /etc/csh.cshrc and /etc/csh.login as well as per-user locations; others do not use any system environment setting file.
– Jonat...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...示预期的进程号和进程名信息。
12. 内核结构跟踪
# cat path.bt
#include <linux/path.h>
#include <linux/dcache.h>
kprobe:vfs_open
{
printf("open path: %s\n", str(((struct path *)arg0)->dentry->d_name.name));
}
# bpftrace path.bt
Attaching 1 probe...
open path: dev...
Only read selected columns
...t 7 columns are "integer" and we set the remaining 6 columns to "NULL" indicating they should be skipped
> read.table("data.txt", colClasses = c(rep("integer", 7), rep("NULL", 6)),
+ header = TRUE)
Year Jan Feb Mar Apr May Jun
1 2009 -41 -27 -25 -31 -31 -39
2 2010 -41 -27 -25 -31 -...
Docker can't connect to docker daemon
...etting SSH command: Something went wrong running an SSH command!
command : cat /etc/os-release
err : exit status 255
output :
just re-run the three commands another time, and it should work the second time.
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