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How do I query if a database schema exists
As part of our build process we run a database update script as we deploy code to 4 different environments. Further, since the same query will get added to until we drop a release into production it has to be able to run multiple times on a given database. Like this:
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Bash command to sum a column of numbers [duplicate]
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@DavidMann: "$@" is used inside a script to represent all the arguments to the script, or nothing/none if there were no arguments. If you're using the awk in pbpaste | awk …, you simply omit the "$@" (though it would usually do no damage; most interactive ...
How to exit in Node.js
...ave anything to do with web servers at all! It's just a host for some JavaScript, with some nifty built-in libraries for doing useful things.
– Brad
Sep 20 '12 at 14:22
6
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How can I get the corresponding table header (th) from a table cell (td)?
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Pure JavaScript's solution:
var index = Array.prototype.indexOf.call(your_td.parentNode.children, your_td)
var corresponding_th = document.querySelector('#your_table_id th:nth-child(' + (index+1) + ')')
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How to create a cron job using Bash automatically without the interactive editor?
...r (crontab -e). If so, What would be the code create a cronjob from a Bash script?
20 Answers
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Using a .php file to generate a MySQL dump
... I would choose the second one, which doesn't return the output to the PHP script -- no need for the PHP script to get the whole SQL dump as a string : you only need it written to a file, and this can be done by the command itself.
That external command will :
be a call to mysqldump, with the ri...
Git Remote: Error: fatal: protocol error: bad line length character: Unab
... .bashrc that produces output. I, for example had this:
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
rvm use ruby-1.9.3-p194@rails32
In this case the output from the rvm use will be (wrongly) interpreted as coming from git. So replace it by:
rvm use ruby-1.9.3-p19...
Convert JSON String To C# Object
...his.test = test; }
}
Then your deserialization code would be:
JavaScriptSerializer json_serializer = new JavaScriptSerializer();
Test routes_list =
(Test)json_serializer.DeserializeObject("{ \"test\":\"some data\" }");
More information can be found in this tutorial:
http://w...
Insert a line at specific line number with sed or awk
I have a script file which I need to modify with another script to insert a text at the 8th line.
9 Answers
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Which Python memory profiler is recommended? [closed]
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For my usecase - a simple image manipulation script, not a complex system, which happened to leave some cursors open - this was the best solution. Very simple to drop in and figure out what's going on, with minimal gunk added to your code. Perfect for quick fixes and pr...