sed can do this.

(Can I do this with sed?  No, but lots of other people can and have.  :-)


On Aug 18, 2011, at 8:22 PM, Michael Gersten wrote:

> I'm trying to match a multiline pattern in a program's output.
> 
> I've got a shell script that runs from cron. It has some output. Normally 
> it's pointless, and clutters my mailbox.
> 
> I've determined that if the program runs properly, the output will match the 
> following:
> 
> /dev/disk.*FDisk_partition_scheme             
> /dev/disk.*/Volumes/XcomQemu
> sending incremental file list
> 
> sent.*
> total size is.*
> "disk." unmounted.
> "disk." ejected.
> 
> Note the following:
> 1. It's multiple lines.
> 2. It has "." and ".*" (only).
> 
> I've looked at expect, and grep(1), re_format(7), and regex(3). Expect 
> doesn't seem to like multiple lines of matching. Nothing in the grep family 
> indicates anything about searching for a newline in the middle of a pattern 
> -- at best, the "patterns in a file" give one pattern per line.
> 
> So what's the best way to test the output of one command against an expected 
> behavior? If something goes wrong, I want to see it; if nothing goes wrong, I 
> don't want to see anything.
> 
> (If you're curious, it's mounting a virtual hard drive, rsync'ing the data of 
> interest into an HFS+ directory, and then unmounting it. I don't want time 
> machine copying a large virtual hard drive when the files of interest are 
> tiny.)
> 
> 
> Michael
> ---
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> 
> Political and economic blog of a strict constitutionalist
> http://StrictConstitution.BlogSpot.com
> 
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