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How to make “if not true condition”?
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try
if ! grep -q sysa /etc/passwd ; then
grep returns true if it finds the search target, and false if it doesn't.
So NOT false == true.
if evaluation in shells are designed to be very flexible, and many times doesn't require chains of ...
Proper way to exit iPhone application?
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In Tech Q&A QA1561, Apple strongly discourages use of exit as it makes the app appear to have crashed. developer.apple.com/iphone/library/qa/qa2008/qa1561.html
– progrmr
May 6 '10 at 12:47
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Python base64 data decode
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import base64
coded_string = '''Q5YACgA...'''
base64.b64decode(coded_string)
worked for me. At the risk of pasting an offensively-long result, I got:
>>> base64.b64decode(coded_string)
2: 'C\x96\x00\n\x00\x00\x00\x00C\x96\x00\x1b\x00\x00\x00\x00...
How to get the first line of a file in a bash script?
... anyhow, even if the latter didn't fail for the reasons described in BashFAQ #24.
– Charles Duffy
Aug 1 '17 at 16:21
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How to remove outliers from a dataset
... from your data:
remove_outliers <- function(x, na.rm = TRUE, ...) {
qnt <- quantile(x, probs=c(.25, .75), na.rm = na.rm, ...)
H <- 1.5 * IQR(x, na.rm = na.rm)
y <- x
y[x < (qnt[1] - H)] <- NA
y[x > (qnt[2] + H)] <- NA
y
}
To see it in action:
set.seed(1)
x &l...
Redirecting to a certain route based on condition
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If you look at the network requests in chrome inspector the route that is being redirected (because the user is not logged in) still gets called and a response gets sent to the browser, and then the redirected path '/login' is called. So this method is n...
How do I grab an INI value within a shell script?
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Still useful and quicker for basic ini files.
– Cyril N.
Apr 21 '16 at 10:45
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sho...
What must I know to use GNU Screen properly? [closed]
...ocked up because you hit some random key combination by accident, do both ^Q and ^A ^Q to try to unlock it.
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In Functional Programming, what is a functor?
... apples. Etc. tree and list are two Functors here.
– Qqwy
Jun 19 '16 at 21:34
3
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jQuery: Return data after ajax call success [duplicate]
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success and error are being deprecated in jQuery 1.8. You should start using .done() and .fail(). See the documentation.
– FibreChips
Jul 7 '17 at 20:45
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