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Bash tool to get nth line from a file
...re NUM is the number of the line you want to print; so, for example, sed '10q;d' file to print the 10th line of file.
Explanation:
NUMq will quit immediately when the line number is NUM.
d will delete the line instead of printing it; this is inhibited on the last line because the q causes the res...
Convert string to integer type in Go?
... "os"
"strconv"
)
func main() {
flag.Parse()
s := flag.Arg(0)
// string to int
i, err := strconv.Atoi(s)
if err != nil {
// handle error
fmt.Println(err)
os.Exit(2)
}
fmt.Println(s, i)
}
...
How to return a part of an array in Ruby?
...e out of range.
a = [ "a", "b", "c", "d", "e" ]
a[2] + a[0] + a[1] #=> "cab"
a[6] #=> nil
a[1, 2] #=> [ "b", "c" ]
a[1..3] #=> [ "b", "c", "d" ]
a[4..7] #=> [ "e" ]
...
How does !!~ (not not tilde/bang bang tilde) alter the result of a 'contains/included' Array method
... |
edited Nov 3 '16 at 20:41
Peter Mortensen
26.5k2121 gold badges9292 silver badges122122 bronze badges
...
How to read a file in reverse order?
...
answered Feb 20 '10 at 10:10
Matt JoinerMatt Joiner
94.2k8585 gold badges321321 silver badges483483 bronze badges
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How do I check in SQLite whether a table exists?
...
1045
I missed that FAQ entry.
Anyway, for future reference, the complete query is:
SELECT name FR...
Procedure expects parameter which was not supplied
...
answered Dec 15 '08 at 15:20
HLGEMHLGEM
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...
Why switch is faster than if
...
answered Jul 15 '11 at 10:56
DanielDaniel
25.2k1616 gold badges8484 silver badges128128 bronze badges
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Booleans, conditional operators and autoboxing
...onditional expression is the result of applying capture conversion (§5.1.10) to lub(T1, T2) (§15.12.2.7).
S1 == <special null type> (see §4.1)
S2 == boolean
T1 == box(S1) == <special null type> (see last item in list of boxing conversions in §5.1.7)
T2 == box(S2) == `Boolean
lub(...
Unique (non-repeating) random numbers in O(1)?
I'd like to generate unique random numbers between 0 and 1000 that never repeat (i.e. 6 doesn't show up twice), but that doesn't resort to something like an O(N) search of previous values to do it. Is this possible?
...