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Get the date (a day before current time) in Bash
... a one-liner, so cut and paste should work -- no line endings assumed. date_days_past () { days_past=${1:-0}; if ! date -v-${days_past}d +%Y%m%d 2>/dev/null; then date --date="-${days_past} day" +%Y%m%d; fi }
– Noah Spurrier
May 16 '16 at 21:29
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CSS background-image - What is the correct usage?
..... +1 for being clear on where the path starts.
– me_
Jan 14 '18 at 8:45
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深入浅出计算机字符集编码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...大家带来一定帮助。问题缘由：前面页面编码方式统一为UTF-8，后台代码（包括UT测试代码）以EUC_JP编码，要求前台输入日文半角片假名后台通过正则表达式能够验证通过，正则表达式为“^(([\x20-\x7e])|(\x8e[\xa6-\xdf])){1,32}$“。现在...
Android read text raw resource file
Things are simple but don't work as supposed to.
12 Answers
12
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Git diff output to file preserve coloring
...ion and open it in Notepad++ or Vim or SublimeText.
git diff > 20150203_someChanges.diff
Thanks @Monsingor
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Simple way to create matrix of random numbers
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You can drop the range(len()):
weights_h = [[random.random() for e in inputs[0]] for e in range(hiden_neurons)]
But really, you should probably use numpy.
In [9]: numpy.random.random((3, 3))
Out[9]:
array([[ 0.37052381, 0.03463207, 0.10669077],
[ 0.05...
How to copy file from HDFS to the local file system
...om HDFS to the local file system . There is no physical location of a file under the file , not even directory . how can i moved them to my local for further validations.i am tried through winscp .
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Ruby on Rails: How can I revert a migration with rake db:migrate?
...to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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In Swift how to call method with parameters on GCD main thread?
...() + 0.1) {
// your code here
}
Older versions of Swift used:
dispatch_async(dispatch_get_main_queue(), {
let delegateObj = UIApplication.sharedApplication().delegate as YourAppDelegateClass
delegateObj.addUIImage("yourstring")
})
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Best way to pretty print a hash
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require 'pp'
pp my_hash
Use pp if you need a built-in solution and just want reasonable line breaks.
Use awesome_print if you can install a gem. (Depending on your users, you may wish to use the index:false option to turn off displaying arr...