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How to iterate over arguments in a Bash script
I have a complex command that I'd like to make a shell/bash script of. I can write it in terms of $1 easily:
8 Answers
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Shell one liner to prepend to a file
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Not possible without a temp file, but here goes a oneliner
{ echo foo; cat oldfile; } > newfile && mv newfile oldfile
You can use other tools such as ed or perl to do it without temp files.
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Check if image exists on server using JavaScript?
...oad = good;
img.onerror = bad;
img.src = imageSrc;
}
checkImage("foo.gif", function(){ alert("good"); }, function(){ alert("bad"); } );
JSFiddle
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Use dynamic (variable) string as regex pattern in JavaScript
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Much easier way: use template literals.
var variable = 'foo'
var expression = `.*${variable}.*`
var re = new RegExp(expression, 'g')
re.test('fdjklsffoodjkslfd') // true
re.test('fdjklsfdjkslfd') // false
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REST APIs: custom HTTP headers vs URL parameters
...comes into play with posts and searches: /orders/find?q=blahblah&sort=foo. There's a fine line between parameters and sub-resources: /orders/view/client/23/active versus /orders/view/client/23?show=active. I recommend the sub-resource style and reserve parameters for searches.
Since each en...
How are Python's Built In Dictionaries Implemented?
Does anyone know how the built in dictionary type for python is implemented? My understanding is that it is some sort of hash table, but I haven't been able to find any sort of definitive answer.
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PHP best way to MD5 multi-dimensional array?
What is the best way to generate an MD5 (or any other hash) of a multi-dimensional array?
13 Answers
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What are the new documentation commands available in Xcode 5? [closed]
...ypewritter font @c with @@p or @@c.
Backslashes and must be escaped: C:\\foo.
And so do @@ signs: user@@example.com
Some more text.
@brief brief text
@attention attention text
@author author text
@bug bug text
@copyright copyright text
@date date text
@invariant invariant text
@note no...
Showing empty view when ListView is empty
...st);
// shows list view
String[] values = new String[] { "foo", "bar" };
// shows empty view
values = new String[] { };
setListAdapter(new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1,
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How do you append to a file in Python?
...nt to pass "a" as the mode argument. See the docs for open().
with open("foo", "a") as f:
f.write("cool beans...")
There are other permutations of the mode argument for updating (+), truncating (w) and binary (b) mode but starting with just "a" is your best bet.
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