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How can I read command line parameters from an R script?
...te(length(readLines(file)) * opt$factor))
}
Given an arbitrary file blah.txt with 23 lines.
On the command line:
Rscript script.R -h outputs
Usage: script.R [options] file
Options:
-n, --count_lines
Count the line numbers [default]
-f FACTOR, --factor=FACTOR
...
How can I view an old version of a file with Git?
...date looks like this:
git show HEAD@{2013-02-25}:./fileInCurrentDirectory.txt
Note that HEAD@{2013-02-25} means "where HEAD was on 2013-02-25" in this repository (using the reflog), not "the last commit before 2013-02-25 in this branch in history".
...
How to get a path to a resource in a Java JAR file
...n you call your resource in order to open it. like new File("rsrc:filename.txt") this will load filename.txt which is packed inside the root of your jar
– gipsh
Jun 16 '16 at 18:45
...
File system that uses tags rather than folders?
...ra tags can appear as directories inside /etc/init.d. If there is a file a.txt with three tags i.e 'etc', 'init.d' & 'asdf' then 'asdf' will appear as directory inside /etc/init.d and full path of a.txt will become /etc/init.d/asdf/a.txt.
...
How do I save and restore multiple variables in python?
...om klepto.archives import file_archive
>>> db = file_archive('foo.txt')
>>> db['1'] = 1
>>> db['max'] = max
>>> squared = lambda x: x**2
>>> db['squared'] = squared
>>> def add(x,y):
... return x+y
...
>>> db['add'] = add
>>>...
How to delete multiple buffers in Vim?
...
Try the script below. The example is for "txt", change it as needed, e.g. to "xml".
Modified buffers are not deleted. Press \bd to delete the buffers.
map <Leader>bd :bufdo call <SID>DeleteBufferByExtension("txt")
function! <SID>DeleteBufferByExt...
vbscript output to console
...")
vbsInterpreter = "cscript.exe"
Call ForceConsole()
Function printf(txt)
WScript.StdOut.WriteLine txt
End Function
Function printl(txt)
WScript.StdOut.Write txt
End Function
Function scanf()
scanf = LCase(WScript.StdIn.ReadLine)
End Function
Function wait(n)
WScript.S...
How can I reverse the order of lines in a file?
...
BSD tail:
tail -r myfile.txt
Reference: FreeBSD, NetBSD, OpenBSD and OS X manual pages.
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MySQL load NULL values from CSV data
...iable ends up containing an empty string:
LOAD DATA INFILE '/tmp/testdata.txt'
INTO TABLE moo
FIELDS TERMINATED BY ","
LINES TERMINATED BY "\n"
(one, two, three, @vfour, five)
SET four = NULLIF(@vfour,'')
;
If they're all possibly empty, then you'd read them all into variables and have multiple S...
How to get the current working directory in Java?
...lt().getPath(".");
And this will give you the path to a file called "Foo.txt" in the working directory:
Path path = FileSystems.getDefault().getPath("Foo.txt");
Edit :
To obtain an absolute path of current directory:
Path path = FileSystems.getDefault().getPath(".").toAbsolutePath();
* Updat...