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Check if a method exists
... +1 For [MyClass instancesRespondToSelector]. I needed it inside a init creation method: When subclassing maybe is necessary to call one super init method instead of others (deprecated ones), since self has not been created yet and respondsToSelector will always return NO.
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How can I do division with variables in a Linux shell?
... than it can't resolve it.
In that case use simple strings like div or devide or something else.
See the code
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Git: Discard all changes on a diverged local branch
...opy nearly unusable. Delete / recreate may have been less elegant, but I didn't have to ask any follow-up questions.
– Electrons_Ahoy
Aug 5 '10 at 22:03
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Is there a generic constructor with parameter constraint in C#?
...her data as well. I often use this type of construct when parsing IFF-like files. I prefer defining static constructors on the type itself, so my dictionary entries end up looking like ["CELL"] = Cell.CreateInstance, ["WRLD"] = World.CreateInstance, ...
– user502255
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Redirect from an HTML page
...ver redirects, so send a 301 status code. This is easy to do via .htaccess files using Apache, or via numerous plugins using WordPress. I am sure there are also plugins for all the major content management systems. Also, cPanel has very easy configuration for 301 redirects if you have that installed...
Class constants in python
...red May 20 '12 at 10:46
betabandidobetabandido
16.1k1010 gold badges5151 silver badges6565 bronze badges
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Fully custom validation error message with Rails
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You have to use a symbol so it will look up in your yml files, like validates_presence_of :address1, :message => :put_some_address_please
– Federico
Sep 4 '15 at 13:28
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Use Expect in a Bash script to provide a password to an SSH command
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A simple Expect script:
File Remotelogin.exp
#!/usr/bin/expect
set user [lindex $argv 1]
set ip [lindex $argv 0]
set password [lindex $argv 2]
spawn ssh $user@$ip
expect "password"
send "$password\r"
interact
Example...
SELECT INTO using Oracle
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I though SELECT INTO was part of the Standard. Did Oracle do something strange here or was it never part of the standard?
– Robert Gould
Feb 12 '10 at 7:21
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Send Email Intent
...cally instructing Android to provide a list of apps that support sending a file of type message/rfc822. That's not the same as sending an e-mail. Use the mailto: protocol instead, because that's what e-mail clients actually understand.
– Paul Lammertsma
May 28 ...