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Immutability of Strings in Java
...t, and changing a reference. s2 still points to the same object as we initially set s1 to point to. Setting s1 to "Help!" only changes the reference, while the String object it originally referred to remains unchanged.
If strings were mutable, we could do something like this:
String s1 = "Hello";
St...
Vagrant's port forwarding not working [closed]
I'm running into a small problem at the end of the Getting Started guide for vagrant . I'm working on a CentOS basebox that has Apache2 running (provisioning via Puppet). I've set up port forwarding for web requests using the following line in Vagrantfile :
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Get specific line from text file using just shell script
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@KanagaveluSugumar read sed's info page. 5!d means delete all lines except 5. shell var is possible, you need double quotes.
– Kent
Apr 24 '14 at 10:15
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How to delete from a text file, all lines that contain a specific string?
How would I use sed to delete all lines in a text file that contain a specific string?
17 Answers
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How could the UNIX sort command sort a very large file?
...link goes into more details, but in essence it divides the input up into smaller portions (that fit into memory) and then merges each portion together at the end.
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ls command: how can I get a recursive full-path listing, one line per file?
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If you really want to use ls, then format its output using awk:
ls -R /path | awk '
/:$/&&f{s=$0;f=0}
/:$/&&!f{sub(/:$/,"");s=$0;f=1;next}
NF&&f{ print s"/"$0 }'
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Multiple Models in a single django ModelForm?
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But how? Usually a FormView only has a single form_class assigned to it.
– erikbwork
Oct 7 '16 at 17:42
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Declare slice or make slice?
In Go, what is the difference between var s []int and s := make([]int, 0) ?
4 Answers
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Why Func instead of Predicate?
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Well, actually you have to place that in the context of the guideline, which is about writing a LINQ provider. So yeah, for LINQ operators, the guideline is to use Func<> and Expression<> as parameters for the extension met...
CSS hack大全 - 创意 - 清泛网 - 专注C/C++及内核技术
...说明：
大家很容易的可以看出这是情境（一）的加强版，适用于更广泛的环境。其实情境（一）中也已经做到了把火狐与IE游览器区分开来了，现在我们要做的是把火狐从其它游览器中再次识别出来。大家仔细看下代码，大家...