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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...
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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 ...
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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&...
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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...
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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+...
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Multiple simultaneous downloads using Wget?

...# | # | # ----> the number of connections http://aria2.sourceforge.net I love it !! share | improve this answer | follow | ...
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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 share | improve this answer | follow...
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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 share | improve this answer | follow ...
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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...
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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...