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Variable interpolation in the shell
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Use
"$filepath"_newstap.sh
or
${filepath}_newstap.sh
or
$filepath\_newstap.sh
_ is a valid character in identifiers. Dot is not, so the shell tried to interpolate $filepath_newstap.
You can use set -u to make the shell exit with an error when yo...
“fatal: Not a git repository (or any of the parent directories)” from git status
This command works to get the files and compile them:
13 Answers
13
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target=“_blank” vs. target=“_new”
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Use "_blank"
According to the HTML5 Spec:
A valid browsing context name is any string with at least one character that does not start with a U+005F LOW LINE character. (Names starting with an underscore are reserved for special keywords.)
A...
Using cURL with a username and password?
I want to access a URL which requires a username/password. I'd like to try accessing it with curl. Right now I'm doing something like:
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Apply a function to every row of a matrix or a data frame
Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R?
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Should Javadoc comments be added to the implementation?
Is it correct practice to add Javadoc comments in the interface and add non-Javadoc comments in the implementation?
7 Answe...
get name of a variable or parameter [duplicate]
I would like to get the name of a variable or parameter:
3 Answers
3
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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
...others
hadoop dfs <args>
dfs is very specific to HDFS. would work for operation relates to HDFS. This has been deprecated and we should use hdfs dfs instead.
hdfs dfs <args>
same as 2nd i.e would work for all the operations related to HDFS and is the recommended command ins...
How do I compare two strings in Perl?
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See perldoc perlop. Use lt, gt, eq, ne, and cmp as appropriate for string comparisons:
Binary eq returns true if the left argument is stringwise equal to the right argument.
Binary ne returns true if the left argument is stringwise not equal to the right argument.
Binary cmp returns -1, ...
GCC -fPIC option
I have read about GCC's Options for Code Generation Conventions , but could not understand what "Generate position-independent code (PIC)" does. Please give an example to explain me what does it mean.
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