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How to ignore xargs commands if stdin input is empty?
...s /empty_dir/ | xargs -i cp {} {}.bak # every {} is replaced with the args from one input line
ls /empty_dir/ | xargs -I ARG cp ARG ARG.bak # like -i, with a user-specified placeholder
Keep in mind that xargs splits the line at whitespace but quoting and escaping are available; RTFM for details.
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str.startswith with a list of strings to test for
...or:
if link.lower().startswith(("js", "catalog", "script", "katalog")):
From the docs:
str.startswith(prefix[, start[, end]])
Return True if string starts with the prefix, otherwise return False. prefix can also be a tuple of prefixes to look for.
Below is a demonstration:
>>&g...
ImportError: no module named win32api
...: Could not find a version that satisfies the requirement pywin32>=223 (from pypiwin32) (from versions: none) "
– Avin Mathew
Jun 24 at 5:10
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Section vs Article HTML5
...hat I cleaned up:
It also describes how to use the <article> tag (from same W3 link above):
<article> is related to <section>, but is distinctly different.
Whereas <section> is for grouping distinct sections of content or
functionality, <article> is for conta...
Android Activity as a dialog
...d that your Dialog appears in the recently used apps list
android:excludeFromRecents="true"
If you want to stop your dialog / activity from being destroyed when the user clicks outside of the dialog:
After setContentView() in your Activity use:
this.setFinishOnTouchOutside(false);
Now when I...
What is the difference between a regular string and a verbatim string?
...teral were used.
There is no difference at runtime between strings created from regular string literals and strings created from a verbatim string literals - they are both of type System.String.
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BigDecimal equals() versus compareTo()
...mal if you don't read the JavaDoc carefully. :) - We got some strange bugs from this until we realized the difference.
– Thomas
Jul 22 '11 at 8:04
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System.Net.WebException HTTP status code
Is there an easy way to get the HTTP status code from a System.Net.WebException ?
6 Answers
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Fast stable sorting algorithm implementation in javascript
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It is possible to get a stable sorting from a non-stable sort function.
Before sorting you get the position of all the elements.
In your sort condition, if both elements are equal, then you sort by the position.
Tada! You've got a stable sort.
I've written an a...
Possible to access the index in a Hash each loop?
...of Enumerable. But too bad that RDoc can't cross reference each_with_index from Hash.html.
– Upgradingdave
Jan 18 '10 at 2:50
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