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How to append one file to another in Linux from the shell?
...w-zero-length file onto itself. This makes sense when you think about the order in which the operations could and should occur but is subtle enough that it catches many people by surprise. So if nothing else, eumiro and you have prompted a further improvement to the answer. Thanks for that!
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What is the Swift equivalent of isEqualToString in Objective-C?
...e considered equal if they contain exactly the same characters in the same order:
let quotation = "We're a lot alike, you and I."
let sameQuotation = "We're a lot alike, you and I."
if quotation == sameQuotation {
println("These two strings are considered equal")
}
// prints "These two strings ...
Xcode without Storyboard and ARC
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How can I remove the first line of a text file using bash/sed script?
...istopherSahnwaldt -- tail is much, much slower than the sed variant, by an order of magnitude. I'm testing it on a file of 500,000K lines (no more than 50 chars per line). However, I then realized I was using the FreeBSD version of tail (which comes with OS X by default). When I switched to GNU tail...
From an array of objects, extract value of a property as array
...ence _.map(), also allow you to provide a dot-separated string or array in order to access sub-properties:
var objArray = [
{
someProperty: { aNumber: 5 }
},
{
someProperty: { aNumber: 2 }
},
{
someProperty: { aNumber: 9 }
}
];
var result = _.map(objA...
How to read a file into a variable in shell?
... all.
My approach now uses read along with the printf builtin's -v flag in order to read the contents of stdin directly into a variable.
# Reads stdin into a variable, accounting for trailing newlines. Avoids
# needing a subshell or command substitution.
# Note that NUL bytes are still unsupported, ...
NumPy or Pandas: Keeping array type as integer while having a NaN value
...that has NA converting to the new 'Int64' dtype will give you an error. In order to solve this you have to round the numbers and then do ".astype('Int64')"
s1 = pd.Series([1.434, 2.343, np.nan])
#without round() the next line returns an error
s1.astype('Int64')
#cannot safely cast non-equivalent f...
Paste a multi-line Java String in Eclipse [duplicate]
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Postgresql: Scripting psql execution with password
...a wildcard for your port/database fields.
You must chmod 0600 ~/.pgpass in order for it to not be silently ignored by psql.
Create an alias in your bash profile that runs your psql command for you. For example:alias postygresy='psql --host hostname database_name -U username' The values should match ...
What's the best way to retry an AJAX request on failure using jQuery?
...der is making sure the $.ajax method wasn't already wrapped previously, in order to avoid the same code running twice.
You can copy-paste these snippets (as-is) to the console to test them
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