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Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...文本编辑器和一个能解释执行的脚本解释器就可以了。 <em>OSem> 当前主流的操作系统都支持shell编程,本文档所述的shell编程是指Li<em>nem>ux下的shell,讲的基本都是P<em>OSem>IX标准下的功能,所以,也适用于U<em>nem>ix及BSD(如Mac <em>OSem>)。 Li<em>nem>ux Li<em>nem>ux默认安...
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Copy multiple files i<em>nem> Pytho<em>nem>

...i<em>nem> o<em>nem>e directory to a<em>nem>other directory usi<em>nem>g Pytho<em>nem>. I have the source path <em>a<em>nem>dem> the desti<em>nem>atio<em>nem> path as stri<em>nem>g. 6 A<em>nem>swers ...
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How do I get the path of a process i<em>nem> U<em>nem>ix / Li<em>nem>ux

...symli<em>nem>k /proc/&lt;pid&gt;/exe has the path of the executable. Use the comm<em>a<em>nem>dem> readli<em>nem>k -f /proc/&lt;pid&gt;/exe to get the value. O<em>nem> AIX, this file does <em>nem>ot exist. You could compare cksum &lt;actual path to bi<em>nem>ary&gt; <em>a<em>nem>dem> cksum /proc/&lt;pid&gt;/object/a.out. ...
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Differe<em>nem>ce betwee<em>nem> a Structure <em>a<em>nem>dem> a U<em>nem>io<em>nem>

Is there a<em>nem>y good example to give the differe<em>nem>ce betwee<em>nem> a struct <em>a<em>nem>dem> a u<em>nem>io<em>nem> ? Basically I k<em>nem>ow that struct uses all the memory of its member <em>a<em>nem>dem> u<em>nem>io<em>nem> uses the largest members memory space. Is there a<em>nem>y other <em>OSem> level differe<em>nem>ce? ...
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How to delete a file or folder?

...<em>osem>.rmdir() removes a<em>nem> empty directory. shutil.rmtree() deletes a directory <em>a<em>nem>dem> all its co<em>nem>te<em>nem>ts. Path objects from the Pytho<em>nem> 3.4+ pathlib module also exp<em>osem>e these i<em>nem>sta<em>nem>ce methods: pathlib.Path.u<em>nem>li<em>nem>k() removes a file or symbolic li<em>nem>k. pathlib.Path.rmdir() removes a<em>nem> empty directory. ...
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How ca<em>nem> I read comm<em>a<em>nem>dem> li<em>nem>e parameters from a<em>nem> R script?

I've got a R script for which I'd like to be able to supply several comm<em>a<em>nem>dem>-li<em>nem>e parameters (rather tha<em>nem> hardcode parameter values i<em>nem> the code itself). The script ru<em>nem>s o<em>nem> Wi<em>nem>dows. ...
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How do I determi<em>nem>e the size of my array i<em>nem> C?

...ith the type, like this: i<em>nem>t a[17]; size_t <em>nem> = sizeof(a) / sizeof(i<em>nem>t); <em>a<em>nem>dem> get the proper a<em>nem>swer (68 / 4 = 17), but if the type of a cha<em>nem>ged you would have a <em>nem>asty bug if you forgot to cha<em>nem>ge the sizeof(i<em>nem>t) as well. So the preferred divisor is sizeof(a[0]) or the equivale<em>nem>t sizeof(*a), the siz...
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How ca<em>nem> I extract the folder path from file path i<em>nem> Pytho<em>nem>?

...the <em>osem>.path.dir<em>nem>ame fu<em>nem>ctio<em>nem> to do this, you just <em>nem>eed to pass the stri<em>nem>g, <em>a<em>nem>dem> it'll do the work for you. Si<em>nem>ce, you seem to be o<em>nem> wi<em>nem>dows, co<em>nem>sider usi<em>nem>g the abspath fu<em>nem>ctio<em>nem> too. A<em>nem> example: &gt;&gt;&gt; import <em>osem> &gt;&gt;&gt; <em>osem>.path.dir<em>nem>ame(<em>osem>.path.abspath(existGDBPath)) 'T:\\Data\\DBDesig<em>nem>' ...
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Which, if a<em>nem>y, C++ compilers do tail-recursio<em>nem> optimizatio<em>nem>?

...t it would work perfectly well to do tail-recursio<em>nem> optimizatio<em>nem> i<em>nem> both C <em>a<em>nem>dem> C++, yet while debuggi<em>nem>g I <em>nem>ever seem to see a frame stack that i<em>nem>dicates this optimizatio<em>nem>. That is ki<em>nem>d of good, because the stack tells me how deep the recursio<em>nem> is. However, the optimizatio<em>nem> would be ki<em>nem>d of <em>nem>ice as w...
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<em>OSem> X Bash, 'watch' comm<em>a<em>nem>dem>

I'm looki<em>nem>g for the best way to duplicate the Li<em>nem>ux 'watch' comm<em>a<em>nem>dem> o<em>nem> Mac <em>OSem> X. I'd like to ru<em>nem> a comm<em>a<em>nem>dem> every few seco<em>nem>ds to patter<em>nem> match o<em>nem> the co<em>nem>te<em>nem>ts of a<em>nem> output file usi<em>nem>g 'tail' <em>a<em>nem>dem> 'sed'. ...