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Escape a string for a sed replace pattern
...ed allow you to use any character, so long as it fits the pattern: $ echo 'foo/bar' | sed s_/_:_ # foo:bar
– PeterJCLaw
Jun 18 '11 at 13:27
2
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In Bash, how do I add a string after each line in a file?
...
Pure POSIX shell and sponge:
suffix=foobar
while read l ; do printf '%s\n' "$l" "${suffix}" ; done < file |
sponge file
xargs and printf:
suffix=foobar
xargs -L 1 printf "%s${suffix}\n" < file | sponge file
Using join:
suffix=foobar
join file file -e...
Using Python String Formatting with Lists
...le token in brackets has no meaning in Python. You usually put brackets in foo = (bar, ) to make it easier to read but foo = bar, does exactly the same thing.
– patrys
Sep 27 '11 at 12:10
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Using Default Arguments in a Function
...the function declaration as follows so you can do what you want:
function foo($blah, $x = null, $y = null) {
if (null === $x) {
$x = "some value";
}
if (null === $y) {
$y = "some other value";
}
code here!
}
This way, you can make a call like foo('blah', nul...
Referring to the null object in Python
...ay to check things for "Noneness" is to use the identity operator, is:
if foo is None:
...
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How to use '-prune' option of 'find' in sh?
...o prune out).
Here's an example:
find . -name .snapshot -prune -o -name '*.foo' -print
This will find the "*.foo" files that aren't under ".snapshot" directories. In this example, -name .snapshot makes up the [conditions to prune], and -name '*.foo' -print is [your usual conditions] and [actions to...
How do I unset an element in an array in javascript?
How do I remove the key 'bar' from an array foo so that 'bar' won't show up in
6 Answers
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How to define “type disjunction” (union types)?
...mplicit object StringWitness extends StringOrInt[String]
}
Next, declare foo like this:
object Bar {
def foo[T: StringOrInt](x: T) = x match {
case _: String => println("str")
case _: Int => println("int")
}
}
And that's it. You can call foo(5) or foo("abc"), and it will work,...
Accessing items in an collections.OrderedDict by index
...ort collections
>>> d = collections.OrderedDict()
>>> d['foo'] = 'python'
>>> d['bar'] = 'spam'
>>> d.items()
[('foo', 'python'), ('bar', 'spam')]
>>> d.items()[0]
('foo', 'python')
>>> d.items()[1]
('bar', 'spam')
Note for Python 3.X
dict.ite...
Custom Python list sorting
...ter alternative to implement the same sorting:
alist.sort(key=lambda x: x.foo)
Or alternatively:
import operator
alist.sort(key=operator.attrgetter('foo'))
Check out the Sorting How To, it is very useful.
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