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What are the special dollar sign shell variables?
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$1, $2, $3, ... are the positional parameters.
"$@" is an array-like construct of all positional parameters, {$1, $2, $3 ...}.
"$*" is the IFS expansion of all positional parameters, $1 $2 $3 ....
$# is the number of positional pa...
git mv and only change case of directory
...sh pop after. Continuing: To get around this, do the following:
mv foo foo2
git add -A
git commit -m "renaming"
mv foo2 FOO
git add -A
git commit --amend -m "renamed foo to FOO"
That's the drawn out way of changing the working directory, committing and then collapsing the 2 commits. You can just ...
How do you install Boost on MacOS?
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152
Download MacPorts, and run the following command:
sudo port install boost
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Is there a way to include commas in CSV columns without breaking the formatting?
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Enclose the field in quotes, e.g.
field1_value,field2_value,"field 3,value",field4, etc...
See wikipedia.
Updated:
To encode a quote, use ", one double quote symbol in a field will be encoded as "", and the whole field will become """". So if you see the following in e.g. ...
How to get number of rows using SqlDataReader in C#
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edited May 2 '17 at 1:25
answered Sep 5 '09 at 13:25
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How to get result of console.trace() as string in javascript with chrome or firefox?
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chjjchjj
12.6k33 gold badges2828 silver badges2424 bronze badges
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The difference between fork(), vfork(), exec() and clone()
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answered Jan 31 '11 at 21:42
JavierJavier
55.7k77 gold badges7474 silver badges119119 bronze badges
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Subset of rows containing NA (missing) values in a chosen column of a data frame
...data frame DF has columns that contain observed values and a column ( VaR2 ) that contains the date at which a measurement has been taken. If the date was not recorded, the CSV file contains the value NA , for missing data.
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