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How to ignore xargs commands if stdin input is empty?

... -L <#lines>, -n <#args>, -i, and -I <string>: ls /empty_dir/ | xargs -n10 chown root # chown executed every 10 args or fewer ls /empty_dir/ | xargs -L10 chown root # chown executed every 10 lines or fewer ls /empty_dir/ | xargs -i cp {} {}.bak # every {} is replaced with the args...
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Why shouldn't I use “Hungarian Notation”?

...me with its kind (using Joel's example: safe string or unsafe string), so called Apps Hungarian has its uses and is still valuable. share edited Sep 26 '08 at 19:56 ...
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What is the difference between gravity and layout_gravity in Android?

... Basically, everything with layout_ defines something that effects the elements outside. – Triang3l Jun 28 '13 at 10:26 ...
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Add a CSS class to

... <%= f.submit 'name of button here', :class => 'submit_class_name_here' %> This should do. If you're getting an error, chances are that you're not supplying the name. Alternatively, you can style the button without a class: form#form_id_here input[type=submit] Try that,...
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How do I sort strings alphabetically while accounting for value when a string is numeric?

... bool IsNumeric(string value) { return int.TryParse(value, out _); } /// <inheritdoc /> public int Compare(string s1, string s2) { const int S1GreaterThanS2 = 1; const int S2GreaterThanS1 = -1; var IsNumeric1 = IsNumeric(s1); var Is...
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What is an optional value in Swift?

...g and writing code more fluent. Unfortunately this obscures the way it actually works. I'll go through some of the tricks later. Note: I'll be talking about optional variables a lot, but it's fine to create optional constants too. I mark all variables with their type to make it easier to understand ...
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Link to add to Google calendar

...p;location=[location] &trp=false &sprop= &sprop=name:" target="_blank" rel="nofollow">Add to my calendar</a> Here's a form which will help you construct such a link if you want (mentioned in earlier answers): https://support.google.com/calendar/answer/3033039 Edit: This link ...
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Android, How can I Convert String to Date?

...g before storing it in the database. In this case en.wikipedia.org/wiki/ISO_8601 – denis.solonenko Dec 20 '11 at 9:35 ...
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How to Correctly handle Weak Self in Swift Blocks with Arguments

...://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/AutomaticReferenceCounting.html Note: I used the term closure instead of block which is the newer Swift term: Difference between block (Objective C) and closure (Swift) in ios ...
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How does setting baselineAligned to false improve performance in LinearLayout?

...s the invisible line letters in text sit on. en.wikipedia.org/wiki/Baseline_%28typography%29 – Zsolt Safrany Sep 29 '12 at 12:26 12 ...