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Catching error codes in a shell pipe
...ility for ages.
This leaks files if you interrupt something. Bomb-proof (more or less) shell programming uses:
tmp=${TMPDIR:-/tmp}/mine.$$
trap 'rm -f $tmp.[12]; exit 1' 0 1 2 3 13 15
...if statement as before...
rm -f $tmp.[12]
trap 0 1 2 3 13 15
The first trap line says 'run the commands 'rm ...
What is the proper way to check if a string is empty in Perl?
...h operands to integers before comparing them.
See the perlop man page for more information.
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Take screenshots in the iOS simulator
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119
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Problems with Android Fragment back stack
...n what's happening is like this (I'm adding numbers to the frag to make it more clear):
// transaction.replace(R.id.detailFragment, frag1);
Transaction.remove(null).add(frag1) // frag1 on view
// transaction.replace(R.id.detailFragment, frag2).addToBackStack(null);
Transaction.remove(frag1).add(f...
How do I ignore ampersands in a SQL script running from SQL Plus?
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I had a CASE statement with WHEN column = 'sometext & more text' THEN ....
I replaced it with
WHEN column = 'sometext ' || CHR(38) || ' more text' THEN ...
you could also use
WHEN column LIKE 'sometext _ more text' THEN ...
(_ is the wildcard for a single character)
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How to programmatically click a button in WPF?
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189
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Make elasticsearch only return certain fields?
...,
"size": ...
}
This is deprecated in ES 5+. And source filters are more powerful anyway!
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What is the difference between Ruby 1.8 and Ruby 1.9
..._CHAR
end
end
unpack('U*').map {|n| n.xchr(escape)}.join
BasicObject More Brutal Than BlankSlate
Ruby 1.9
irb(main):001:0> class C < BasicObject; def f; Math::PI; end; end; C.new.f
NameError: uninitialized constant C::Math
Ruby 1.8.6
irb(main):001:0> require 'blankslate'
=> tr...
Android Center text on canvas
...ainst this approach. The approach with Paint.getTextBounds() seems to work more accurate.
– andreas1724
Aug 28 '15 at 21:39
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Command to change the default home directory of a user
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Not only move the content, I see it more like move whole folder = original folder (/home/username typically) is removed.
– Betlista
Jul 4 '17 at 11:28
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