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What linux shell command returns a part of a string? [duplicate]
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If you are looking for a shell utility to do something like that, you can use the cut command.
To take your example, try:
echo "abcdefg" | cut -c3-5
which yields
cde
Where -cN-M tells the cut command to return columns ...
How to get the browser to navigate to URL in JavaScript [duplicate]
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This works in all browsers:
window.location.href = '...';
If you wanted to change the page without it reflecting in the browser back history, you can do:
window.location.replace('...');
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Is there a conditional ternary operator in VB.NET?
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Depends upon the version. The If operator in VB.NET 2008 is a ternary operator (as well as a null coalescence operator). This was just introduced, prior to 2008 this was not available. Here's some more info: Visual Basic If announcement
Example:
Dim ...
Show current key setting?
...eader
Producing output like:
mapleader ,
It may be undefined if not previously set, defaulting instead to a backslash \
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How to delete migration files in Rails 3
...rsion before the one I want to delete.
Delete the migration file manually.
If there are pending migrations (i.e., the migration I removed was not the last one), I just perform a new rake db:migrate again.
If your application is already on production or staging, it's safer to just write another mig...
Determine if an element has a CSS class with jQuery
I'm working with jQuery and looking to see if there is an easy way to determine if the element has a specific CSS class associated with it.
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How can I combine two commits into one commit? [duplicate]
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You want to git rebase -i to perform an interactive rebase.
If you're currently on your "commit 1", and the commit you want to merge, "commit 2", is the previous commit, you can run git rebase -i HEAD~2, which will spawn an editor listing all the commits the rebase will traverse. You ...
Longest line in a file
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@Thomas. Expressing it as a pipe is more general than specifying a file as an option. In my case, I'll be using output piped from a database query.
– Andrew Prock
Oct 31 '09 at 23:31
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Why is argc not a constant?
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(Aside: Interestingly, although getopt's prototype suggests it won't modify argv[] but may modify the strings pointed to, the Linux man page indicates that getopt permutes its arguments, and it appears they know they're being naughty. The man page at the Open Group does not mention this permutat...
Given an RGB value, how do I create a tint (or shade)?
...s and other shading) should be done in linear RGB. However, RGB colors specified in documents or encoded in images and video are not likely to be in linear RGB, in which case a so-called inverse transfer function needs to be applied to each of the RGB color's components. This function varies with th...