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ruby system command check exit code
...tevm --invalid-option")
$? #=> #<Process::Status: pid 9926 exit 2>
$?.exitstatus #=> 2
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Decreasing for loops in Python impossible?
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220
for n in range(6,0,-1):
print n
# prints [6, 5, 4, 3, 2, 1]
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What's the meaning of Base SDK, iOS deployment target, Target, and Project in xcode
...cept that base sdk >= deployment target.
You specify build settings on 2 levels as each project can have multiple targets and you might not want the same settings for all targets. The project-level settings override the default settings and the target-level settings override the project-level s...
How do I script a “yes” response for installing programs?
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The 'yes' command will echo 'y' (or whatever you ask it to) indefinitely. Use it as:
yes | c...
How to know the size of the string in bytes?
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132
You can use encoding like ASCII to get a character per byte by using the System.Text.Encoding cl...
Stream.Seek(0, SeekOrigin.Begin) or Position = 0
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inserting characters at the start and end of a string
...you can also create a string with n Ls by using multiplication:
m = 1
n = 2
yourstring = ("L" * m) + yourstring + ("L" * n)
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Git : List all unmerged changes in git
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229
To list branches with commits not merged into master:
git branch --no-merged master
To list...
How do I convert a string to a lower case representation?
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Determine if an HTML element's content overflows
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Normally, you can compare the client[Height|Width] with scroll[Height|Width] in order to detec...