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Remove the last line from a file in Bash
...$ d' foo.txt
The -i option does not exist in GNU sed versions older than 3.95, so you have to use it as a filter with a temporary file:
cp foo.txt foo.txt.tmp
sed '$ d' foo.txt.tmp > foo.txt
rm -f foo.txt.tmp
Of course, in that case you could also use head -n -1 instead of sed.
MacOS:
On M...
How to check if a string is a valid hex color representation?
... -> match end
i -> ignore case
If you need support for 3-character HEX codes, use the following:
/^#([0-9A-F]{3}){1,2}$/i.test('#ABC')
The only difference here is that
[0-9A-F]{6}
is replaced with
([0-9A-F]{3}){1,2}
This means that instead of matching exactly 6 charact...
GroupBy pandas DataFrame and select most common value
...ata frame with three string columns. I know that the only one value in the 3rd column is valid for every combination of the first two. To clean the data I have to group by data frame by first two columns and select most common value of the third column for each combination.
...
How do I get bit-by-bit data from an integer value in C?
...
Ashish Ahuja
4,70099 gold badges4343 silver badges6161 bronze badges
answered Feb 12 '10 at 4:54
forefingerforefinger
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How to make shallow git submodules?
...
135
New in the upcoming git1.8.4 (July 2013):
"git submodule update" can optionally clone the ...
Find out if string ends with another string in C++
...ing test1 = "binary";
std::string test2 = "unary";
std::string test3 = "tertiary";
std::string test4 = "ry";
std::string ending = "nary";
std::cout << hasEnding (test1, ending) << std::endl;
std::cout << hasEnding (test2, ending) << std::endl;
std...
How to install node.js as windows service?
...
cchamberlain
13.3k66 gold badges4848 silver badges6363 bronze badges
answered Sep 3 '13 at 4:44
CoreyCorey
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What makes Lisp macros so special?
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313
To give the short answer, macros are used for defining language syntax extensions to Common Li...
Get DOS path instead of Windows path
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3
This is very lame, and helpful.
– elgabito
Sep 21 '11 at 19:11
...
Uber5岁了，一次性告诉你它的商业之道 - 资讯 - 清泛网 - 专注C/C++及内核技术
...的想法。
这或许的确与叫不到车的实际经验有关。今年39岁的特拉维斯·卡兰尼克在洛杉矶长大。这是美国甚至全球交通最拥堵的城市之一。洛杉矶出租车司机联盟2009年的一份调查报告显示：这座近400万人口的城市当时只有9家...