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Check number of arguments passed to a Bash script
I would like my Bash script to print an error message if the required argument count is not met.
10 Answers
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Preview an image before it is uploaded
...ng
}
}
$("#imgInp").change(function() {
readURL(this);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form runat="server">
<input type='file' id="imgInp" />
<img id="blah" src="#" alt="your image" />
<...
How do I create a crontab through a script
I need to add a cron job thru a script I run to set up a server. I am currently using Ubuntu. I can use crontab -e but that will open an editor to edit the current crontab. I want to do this programmatically.
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What does $$ mean in the shell?
... (e.g., /tmp). It's easy to litter /tmp with symlinks that will cause your script to write somewhere undesirable. mktemp is much better.
– Chris Jester-Young
Sep 17 '08 at 0:11
5
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How to detect the OS from a Bash script?
...ve some OS specific aliases so I was looking for a way to determine if the script is running on Mac OS X, Linux or Cygwin .
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TypeError: $.ajax(…) is not a function?
...l-version of jquery and not some slim version.
I was using the jquery cdn-script link that comes with jquery. The problem is this one by default is slim.jquery.js which doesn't have the ajax function in it. So, if you're using (copy-pasted from Bootstrap website) slim version jquery script link, us...
Export database schema into SQL file
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You can generate scripts to a file via SQL Server Management Studio, here are the steps:
Right click the database you want to generate scripts for (not the table) and select tasks - generate scripts
Next, select the requested table/tables,...
How to set environment variables from within package.json
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Set the environment variable in the script command:
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"scripts": {
"start": "node app.js",
"test": "NODE_ENV=test mocha --reporter spec"
},
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Then use process.env.NODE_ENV in your app.
Note: This is for Mac & Linux only. For Windows refer to the co...
PowerShell script to return versions of .NET Framework on a machine?
What would a PowerShell script be to return versions of the .NET Framework on a machine?
16 Answers
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In PHP, why does not show a parse error?
...gt; (known as short_open_tag)
<?php ... ?> (the standard really)
<script language="php"> ... </script> (not recommended)
<% ... %> (deprecated and removed ASP-style tag after 5.3.0)
Apparently, you can open a PHP block one way, and close it the other. Didn't know that.
So ...