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How can I get the current date and time in the terminal and set a custom command in the terminal for
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Another way: root@linux 17:32:02 /linux >cat /proc/driver/rtc rtc_time : 23:38:24 rtc_date : 2014-07-10
– Lunar Mushrooms
Jul 11 '14 at 6:40
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如何诊断CDN故障 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...载太慢，这里给一个利用xargs并发下载的例子：
shell> cat ip.txt | xargs -n 1 -P 0 -I {} \
wget -q -e http_proxy={} -O {} "http://url/to/file" &
最后看看文件散列是否一致就大功告成了：
shell> md5sum *
一旦知道了哪个节点有问题，可以利用...
What is the difference between LR, SLR, and LALR parsers?
...ing that GLR parsers can parse any context free language, using more complicated machinery but exactly the same tables (including the smaller version used by LALR). This means that GLR is strictly more powerful than LR, LALR and SLR; pretty much if you can write a standard BNF grammar, GLR will pars...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...行。
12. 一个验证passwd文件有效性的例子
$ cat /etc/passwd | awk -F: '\ NF != 7{\ printf("line %d,does not have 7 fields:%s\n",NR,$0)}\ $1 !~ /[A-Za-z0-9]/{printf("line %d,non alpha and numeric user id:%d: %s\n,NR,$0)}\ $2 == "*" {printf("line %d, no password: %s\n",NR...
Pip install Matplotlib error with virtualenv
...dev
sudo apt-get install libfreetype6-dev
Ubuntu https://apps.ubuntu.com/cat/applications/libpng12-0/
or using following command
sudo apt-get install libpng12-0
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How to read a (static) file from inside a Python package?
...ng code (porting also explained here).
Let's assume your templates are located in a folder nested inside your module's package:
<your-package>
+--<module-asking-the-file>
+--templates/
+--temp_file <-- We want this file.
Note 1: For sure...
Is there a better way to express nested namespaces in C++ within the header
...R_EXPAND(VA_COUNT_HELPER(__VA_ARGS__, 6, 5, 4, 3, 2, 1))
#define VA_SELECT_CAT(_Name, _Count, ...) VA_HELPER_EXPAND(_Name##_Count(__VA_ARGS__))
#define VA_SELECT_HELPER(_Name, _Count, ...) VA_SELECT_CAT(_Name, _Count, __VA_ARGS__)
#define VA_SELECT(_Name, ...) VA_SELECT_HE...
What is the Python 3 equivalent of “python -m SimpleHTTPServer”
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Using 2to3 utility.
$ cat try.py
import SimpleHTTPServer
$ 2to3 try.py
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skippi...
Multiplication on command line terminal
... assigning via k. I certainly remember the default precision being 0 (truncation to integer). Am I mis-remembering, or is it simply that newer implementations have changed behavior?
– William Pursell
Jun 15 '12 at 1:32
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Opposite of %in%: exclude rows with values specified in a vector
A categorical variable V1 in a data frame D1 can have values represented by the letters from A to Z. I want to create a subset D2, which excludes some values, say, B, N and T. Basically, I want a command which is the opposite of %in%
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