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This is the SECOND command in a set for five that are needed for a Twitter stream feed.
This command creates variable "b", the so-called "base string" required for oauth in Twitter stream feed requests. (The 256 char limit prevents giving it a better name)
We use five environment variables created by a previous step: id, k1, once, ts and k3.
The five environment variables are created in a separate command, please see my other commands.
For more information on the signature base string, see dev.twitter.com/apps, click on any app (or create a new one) and then go to the "OAuth Tool" tab.
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