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Makefile经典教程（入门必备） - C/C++ - 清泛网移动版 - 专注C/C++及内核技术
Makefile经典教程（入门必备）Linux_Shell_Classic_tutorialmakefile很重要 什么是makefile？或许很多Winodws的程序员都不知道这个东西，因为那些Windows的IDE都为你做了这个工作，但我觉得要作
makefile。makefile带来的好处就是——“自动化...
How do I handle newlines in JSON?
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edited Oct 14 '13 at 12:04
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javascript: recursive anonymous function?
Let's say I have a basic recursive function:
19 Answers
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Truncate number to two decimal places without rounding
Suppose I have a value of 15.7784514, I want to display it 15.77 with no rounding.
36 Answers
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Select random lines from a file
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If you just need a random set of lines, not in a random order, then shuf is very inefficient (for big file): better is to do reservoir sampling, as in this answer.
– petrelharp
Sep 6 '15 at 23:24
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Split string into an array in Bash
...e an element or add an element and then the indices are not contiguous.
unset "array[1]"
array[42]=Earth
To get the number of elements in an array:
echo "${#array[@]}"
As mentioned above, arrays can be sparse so you shouldn't use the length to get the last element. Here's how you can in Bash 4...
How to start an application using android ADB tools?
... You won't need to have aapt in your path (as long as "android" is) if you set the PATH in the adb-run.sh script, like this: PATH=$(dirname $(which android))/../build-tools/20.0.0:$PATH
– Steve Lemke
Oct 23 '14 at 20:16
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Concatenate multiple files but include filename as section headers
I would like to concatenate a number of text files into one large file in terminal. I know I can do this using the cat command. However, I would like the filename of each file to precede the "data dump" for that file. Anyone know how to do this?
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Git Symlinks in Windows
...A
git status
# On branch master
# Changes to be committed:
# (use "git reset HEAD <file>..." to unstage)
#
# new file: dir/foo/bar/nuthafile
# modified: file
# deleted: lnk_bar # POLLUTION
# new file: lnk_bar/baz # POLLUTION
# new file: ...
Saving enum from select in Rails 4.1
...tion>
</select>
Values went from "0" to "red" and now we're all set.
If you're using a regular ol' rails text_field it's:
f.select :color, Wine.colors.keys.to_a
If you want to have clean human-readable attributes you can also do:
f.select :color, Wine.colors.keys.map { |w| [w.hum...