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Get specific line from text file using just shell script
...ple:
head -n $line file | tail -1
If not, this should work:
x=0
want=5
cat lines | while read line; do
x=$(( x+1 ))
if [ $x -eq "$want" ]; then
echo $line
break
fi
done
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im...
How to use mongoimport to import csv
...Example below was for 1.7.3. Are you using an older version of MongoDB?
$ cat > locations.csv
Name,Address,City,State,ZIP
Jane Doe,123 Main St,Whereverville,CA,90210
John Doe,555 Broadway Ave,New York,NY,10010
ctrl-d
$ mongoimport -d mydb -c things --type csv --file locations.csv --headerline
c...
Uniq by object attribute in Ruby
...e of a Hash to enforce uniqueness. Here's a couple more ways to skin that cat:
objs.inject({}) {|h,e| h[e.attr]=e; h}.values
That's a nice 1-liner, but I suspect this might be a little faster:
h = {}
objs.each {|e| h[e.attr]=e}
h.values
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(Deep) copying an array using jQuery [duplicate]
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similar: var a = [1,2,3]; var b = ([]).concat(a); b is a copy
– Yauhen Yakimovich
May 7 '12 at 15:38
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ArithmeticException: “Non-terminating decimal expansion; no exact representable decimal result”
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RoundingMode.HALF_EVEN is recommended for financial applications. This is what's used in banking
– ACV
Sep 19 '16 at 19:01
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Rename a file in C#
...e); // Rename the oldFileName into newFileName
Or surround it with a try catch to avoid an exception.
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Sorting arrays in NumPy by column
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I suppose this works: a[a[:,1].argsort()]
This indicates the second column of a and sort it based on it accordingly.
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Replace tabs with spaces in vim
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Awesome tip! Vim showed me a perfectly idented file while cat (linux cmd) showed irregular identation. I just changed the 2 spaces to 4 as I use in Vim set ts = 4.
– karlphillip
Nov 23 '11 at 12:20
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Unix's 'ls' sort by name
...output to a terminal, work when piping). You can "fix" this with piping to cat, use the C.UTF-8 locale (if your system supports it) and/or use the -b flag. Even better, do not use ls at all, better use `
– 12431234123412341234123
Sep 5 '17 at 16:36
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Remove last character from C++ string
... though (pop_back did not exist in C++03) and it is also an in-place modification (and the OP never clarified whether he wanted in-place or not)... as such, he has a correct answer, but not the only possible one.
– Matthieu M.
May 21 '13 at 6:24
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