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How do I read the first line of a file using cat?
...
You don't, use head instead.
head -n 1 file.txt
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How do I use Ruby for shell scripting?
...ding current dir.
#=> array of relative names
File.expand_path('~/file.txt') #=> "/User/mat/file.txt"
File.dirname('dir/file.txt') #=> 'dir'
File.basename('dir/file.txt') #=> 'file.txt'
File.join('a', 'bunch', 'of', 'strings') #=> 'a/bunch/of/strings'
__FILE__ #=> the name of the...
PHP json_encode encoding numbers as strings
...ray( 'foo' => 1, 'bar' => 2, 'baz' => 'Hello, world');
$json_obj_txt = json_encode(new testclass());
$json_arr_txt = json_encode($testarr);
echo "<p>Object encoding:</p><pre>" . $json_obj_txt . "</pre>";
echo "<p>Array encoding:</p><pre>" . $json_...
What's the difference between “Write-Host”, “Write-Output”, or “[console]::WriteLine”?
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write-host "hello"
Now run in PowerShell:
PS> .\a.ps1 > someFile.txt
hello
PS> type someFile.txt
PS>
As seen, you can't redirect them into a file. This maybe surprising for someone who are not careful.
But if switched to use write-output instead, you'll get redirection working as...
What is the difference between Class.getResource() and ClassLoader.getResource()?
...he following are basically equivalent:
foo.bar.Baz.class.getResource("xyz.txt");
foo.bar.Baz.class.getClassLoader().getResource("foo/bar/xyz.txt");
And so are these (but they're different from the above):
foo.bar.Baz.class.getResource("/data/xyz.txt");
foo.bar.Baz.class.getClassLoader().getResou...
Revert changes to a file in a commit
...arlier commit:
For example, you want to revert changes in 1 file (badfile.txt) in commit aaa222:
aaa333 Good commit
aaa222 Problem commit containing badfile.txt
aaa111 Base commit
Rebase on the base commit, amend the problem commit, & continue.
1) Start interactive rebase:
git rebase -i aa...
How to redirect 404 errors to a page in ExpressJS?
...found' });
return;
}
// default to plain-text. send()
res.type('txt').send('Not found');
});
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More lines in command window
...complement the answer(s) above, its also possible to export the lines to a txt file
using > fileName.txt
For example:
myProgram.exe > output.txt // will create a new file with all the output of myProgram
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Bash command to sum a column of numbers [duplicate]
...p float numbers. With cut you can select columns from the input: cat input.txt | cut -d ' ' -f 8 | paste -sd+ | bc -l will add all float numbers in column 8 of the input (space being the field separator).
– Arne
Sep 24 '13 at 14:59
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Create Directory When Writing To File In Node.js
... @chrismarx imagine the following path: "/home/documents/a/b/c/myfile.txt". "/home/documents" exists, while everything in front of it doesn't. When "ensureDirectoryExistence" is called for the 1st time, dirname is "/home/documents/a/b/c". I can't call fs.mkdirSync(dirname) right now because "/h...