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How can I delete a newline if it is the last character in a file?
...put (it is the POSIX-compliant alternative to the nonstandard echo -n; see http://pubs.opengroup.org/onlinepubs/009696799/utilities/echo.html and https://unix.stackexchange.com/a/65819)
A guide to the other answers:
If Perl is available, go for the accepted answer - it is simple and memory-eff...
20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...计是监控正在运行的系统和网络资源。它有一个内置的 HTTP web 服务去定期收集系统和网络信息并显示成图片。它可以监视系统的平均负载使用、内存的分配、磁盘驱动器、系统服务、网络端口、邮件统计（Sendmail、Postfix、Dovecot ...
How can I style even and odd elements?
...
Demo: http://jsfiddle.net/thirtydot/K3TuN/1323/
li {
color: black;
}
li:nth-child(odd) {
color: #777;
}
li:nth-child(even) {
color: blue;
}
<ul>
<li>ho</li>
<li>ho</li&...
Regex to test if string begins with http:// or https://
... regexp which will check the start of a string, and if it contains either http:// or https:// it should match it.
9 Ans...
How many bytes does one Unicode character take?
...ed in your browser (probably because the font doesn't support them), go to http://codepoints.net/U+1F6AA (replace 1F6AA with the codepoint in hex) to see an image.
U+0061 LATIN SMALL LETTER A: a
Nº: 97
UTF-8: 61
UTF-16: 00 61
U+00A9 COPYRIGHT SIGN: ©
Nº: 169
UTF-8: C2 A9
UTF-16: 00 A9
U+...
Multiple simultaneous downloads using Wget?
...# |
# |
# ----> the number of connections
http://aria2.sourceforge.net
I love it !!
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File content into unix variable with newlines
...nes # strip trailing newlines
printf "%s\n" "${lines[@]}"
See also:
http://bash-hackers.org/wiki/doku.php/commands/builtin/mapfile
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Is an index needed for a primary key in SQLite?
... integer affinity
and a unique index, not as an alias for the rowid.
See: http://www.sqlite.org/lang_createtable.html#rowid
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OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...ectly).
For reference, here is a sample code in Mathematica:
f = Import["http://thwartedglamour.files.wordpress.com/2010/06/my-coffee-table-1-sa.jpg"]
f = ImageResize[f, ImageDimensions[f][[1]]/4]
g = MedianFilter[ColorConvert[f, "Grayscale"], 2]
h = DeleteSmallComponents[Thinning[
Binarize[I...
Cost of exception handlers in Python
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...