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Searching for UUIDs in text with regex
... x is any hexadecimal digit and y is one of 8, 9, A, or B. e.g. f47ac10b-58cc-4372-a567-0e02b2c3d479.
source: http://en.wikipedia.org/wiki/Uuid#Definition
Therefore, this is technically more correct:
/[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89aAbB][a-f0-9]{3}-[a-f0-9]{12}/
...
Is there a performance gain in using single quotes vs double quotes in ruby?
... ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c = 'a string'; end}
x.report("assign double") { n.times...
DROP IF EXISTS VS DROP?
...r 5 '12 at 11:31
Mike Sherrill 'Cat Recall'Mike Sherrill 'Cat Recall'
78.5k1616 gold badges103103 silver badges156156 bronze badges
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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
...used when you are dealing with different file systems such as Local FS, (S)FTP, S3, and others
hadoop dfs <args>
dfs is very specific to HDFS. would work for operation relates to HDFS. This has been deprecated and we should use hdfs dfs instead.
hdfs dfs <args>
same as 2nd ...
Can git ignore a specific line?
...d" bit is on, git stops checking the working tree files for possible modifications, so you need to manually unset the bit to tell git when you change the working tree file.
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Why do some websites add “Slugs” to the end of URLs? [closed]
... take a guess at url's simply from the address bar. i.love.pets.com/search/cats+dogs could easily lead to i.love.pets.com/search/pug+puppies etc
– Xian
Sep 6 '08 at 13:51
12
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Can a shell script set environment variables of the calling shell? [duplicate]
...f the backquoted expression, this has the desired result.
To simplify invocation for csh, tcsh, or similar shells:
alias dosetit 'eval `setit-csh`'
or for sh, bash, and the like:
alias dosetit='eval `setit-sh`'
One nice thing about this is that you only have to maintain the list in one place....
How to get current memory usage in android?
...M on older versions, it seems it will just crash without you being able to catch it. Here's how to check for memory usage:
val nativeHeapSize = Debug.getNativeHeapSize()
val nativeHeapFreeSize = Debug.getNativeHeapFreeSize()
val usedMemInBytes = nativeHeapSize - nativeHeapFreeSize
val usedMemInPerc...
Git: “Corrupt loose object”
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git cat-file -t <SHA1> will tell you the type. If not corrupted, you can then do git cat-file <type> <SHA1> to see the content (I used it for a blob, I guess it will also show you the contents of other types.)
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SEH stack 结构探索（1）--- 从 SEH 链的最底层（线程第1个SEH结构）说起 -...
...e806000000 call ntdll32!__RtlUserThreadStart (772e9d1b)
772e9d15 cc int 3
772e9d16 90 nop
772e9d17 90 nop
772e9d18 90 nop
772e9d19 90 nop
772e9d1a 90 nop
772e9d1b 6a14 push 14h
772...