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Assigning default values to shell variables with a single command in bash
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Very close to what you posted, actually:
FOO=${VARIABLE:-default} # If variable not set or null, use default.
Or, which will assign default to VARIABLE as well:
FOO=${VARIABLE:=default} # If variable not set or null, set it to default.
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Getting the HTTP Referrer in ASP.NET
... look with reflector shows that UrlReferrer does a lot more than a simple call to ServerVariables("HTTP_REFERER")
– Diadistis
Nov 23 '10 at 16:42
13
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How to add external library in IntelliJ IDEA?
...ory had only out and src directories in it. So I created a new directory called "libs", and put the jar in it. But I don't know if this is what the direction intended... Then "Refresh project so libs show up in the structure". I could find no command to "refresh". How does one refresh a project...
Get Substring between two characters using javascript
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Trivial solution but handy especially if you want to avoid regular expressions.
– Nikolay Frick
Jun 24 '15 at 20:59
10
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What does the Subversion status symbol “~” mean?
...t has been replaced by different kind of object.
So perhaps it was originally a single file, but you changed it to a directory, or something along those lines?
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Extract date (yyyy/mm/dd) from a timestamp in PostgreSQL
...swered May 26 '11 at 2:40
James AllmanJames Allman
37.4k99 gold badges5252 silver badges6969 bronze badges
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使用 XML 和 Web 服务 · App Inventor 2 中文网
... both delimited and non-delimited items, then the non-delimited items will all be extracted processed as if they had been a sequence of items delimited by the tag “content”. For example, decoding
nobody
happy
everybody
sad
will produce a pair just as in the last ex...
Press alt + numeric in bash and you get (arg [numeric]) what is that?
...hat is significant. If you pass a negative argument to a command which normally acts in a forward direction, that command will act in a backward direction. For example, to kill text back to the start of the line, you might type 'M-- C-k'.
The general way to pass numeric arguments to a command is to ...
Is the 'type' attribute necessary for tags?
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@MatthieuNapoli : all browsers are required to support the <script> HTML tag, ignoring its contents if they don't support the scripting language.
– MestreLion
Jan 13 '19 at 17:38
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How can i use iptables on centos 7? [closed]
I installed CentOS 7 with minimal configuration (os + dev tools). I am trying to open 80 port for httpd service, but something wrong with my iptables service ... what's wrong with it? What am I doing wrong?
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