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symbolic link: find all files that link to this file
...depends, if you are trying to find links to a specific file that is called foo.txt, then this is the only good way:
find -L / -samefile path/to/foo.txt
On the other hand, if you are just trying to find links to any file that happens to be named foo.txt, then something like
find / -lname foo.txt
...
Including all the jars in a directory within the Java classpath
...rectory with the extension .jar or .JAR. For example, the
class path entry foo/* specifies all JAR files in the directory named
foo. A classpath entry consisting simply of * expands to a list of all
the jar files in the current directory.
A class path entry that contains * will not match class files...
How can I recursively find all files in current and subfolders based on wildcard matching?
...
Use find for that:
find . -name "foo*"
find needs a starting point, and the . (dot) points to the current directory.
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How to pretty print XML from the command line?
...bxml2-utils
This utility comes with libxml2-utils:
echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' |
xmllint --format -
Perl's XML::Twig
This command comes with XML::Twig perl module, sometimes xml-twig-tools package:
echo '<root><foo ...
Template default arguments
...
You have to do:
Foo<> me;
The template arguments must be present but you can leave them empty.
Think of it like a function foo with a single default argument. The expression foo won't call it, but foo() will. The argument syntax mus...
Convenient C++ struct initialisation
... allowed in C++ and you don't want style B then how about using style BX:
FooBar fb = { /*.foo=*/ 12, /*.bar=*/ 3.4 }; // :)
At least help at some extent.
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C++ static virtual members?
...ring getTypeInformation() { return getTypeInformationStatic(); }
};
class Foo: public Object
{
public:
static string getTypeInformationStatic() { return "derived class";}
virtual string getTypeInformation() { return getTypeInformationStatic(); }
};
What if base class has a great number of...
Abort makefile if variable not set
...fined, ...) from inside the recipe
Just move the check into the recipe:
foo :
@:$(call check_defined, BAR, baz value)
The leading @ sign turns off command echoing and : is the actual command, a shell no-op stub.
Showing target name
The check_defined function can be improved to also outp...
How to version control a record in a database
...
Let's say you have a FOO table that admins and users can update. Most of the time you can write queries against the FOO table. Happy days.
Then, I would create a FOO_HISTORY table. This has all the columns of the FOO table. The primary key i...
What does map(&:name) mean in Ruby?
...
It's shorthand for tags.map(&:name.to_proc).join(' ')
If foo is an object with a to_proc method, then you can pass it to a method as &foo, which will call foo.to_proc and use that as the method's block.
The Symbol#to_proc method was originally added by ActiveSupport but has be...