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How to select a CRAN mirror in R
...t the historical record speak. But because vandals will come, I put a postscriptum in.
– Dirk Eddelbuettel
Oct 8 '18 at 3:08
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Rearrange columns using cut
...ry often inefficient. Typically, you will find that the corresponding Awk script is a lot faster, for example. You should also be careful to quote the values "$col2" and "$col1" -- there could be shell metacharacters or other shenanigans in the data.
– tripleee
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Command to list all files in a folder as well as sub-folders in windows
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A description of the switches used would greatly improve this answer.
– Gusdor
May 3 '17 at 11:34
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json_encode/json_decode - returns stdClass instead of Array in PHP
Observe this little script:
7 Answers
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Is there a way to 'uniq' by column?
... If you need the last uniq instead of the first then this awk script will help: awk -F',' '{ x[$1]=$0 } END { for (i in x) print x[i] }' file
– Sukima
Oct 1 '15 at 17:36
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Eclipse Build Path Nesting Errors
.... Should you migrate to using maven later, it'll also help doing this in a scripted, repeatable way.
Hope that clears up your issue.
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How to run `rails generate scaffold` when the model already exists?
...ld for your model, see scaffold_controller. Just for clarity, here's the description on that:
Stubs out a scaffolded controller and its views. Pass the model name,
either CamelCased or under_scored, and a list of views as arguments.
The controller name is retrieved as a pluralized ve...
Simple regular expression for a decimal with a precision of 2
... as [0-9] as I think it's easier to read.
Also, here is the simple Python script I used to check it:
import re
deci_num_checker = re.compile(r"""^[0-9]+(\.[0-9]{1,2})?$""")
valid = ["123.12", "2", "56754", "92929292929292.12", "0.21", "3.1"]
invalid = ["12.1232", "2.23332", "e666.76"]
assert len...
What should I set JAVA_HOME environment variable on macOS X 10.6?
Many Java applications that use shell scripts to configure their environment use the JAVA_HOME environment variable to start the correct version of Java, locate JRE JARs, and so on.
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How do I remove  from the beginning of a file?
... sequence of characters ($EF $BB $BF for UTF-8), so just remove them using scripts or configure the editor so it's not added.
From Removing BOM from UTF-8:
#!/usr/bin/perl
@file=<>;
$file[0] =~ s/^\xEF\xBB\xBF//;
print(@file);
I am sure it translates to PHP easily.
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