On Fri, Jun 04, 2010 at 12:28:27AM -0400, Eben King wrote:
> On Thu, 3 Jun 2010, Scotty Logan wrote:
>
>> On Jun 2, 2010, at 7:23 PM, Eben King wrote:
>>> I'm pretty good at regexes, but programming in sed is where I break
> down. How does one convert this:
>>>
>>> A1
>>> B1
>>> A2
>>> B2
>>> A3
>>> B3
>>> ...
>>>
>>> into this:
>>>
>>> A1 B1
>>> A2 B2
>>> A3 B3
>>> ...
>>
>>
>> Assuming the data's exactly like the example:
>>
>> % awk '/^A/{s=$1;}/^B/{print s,$1}' data-file
>
> What I'm trying to do is this: I have an almost-one-liner that takes a bunch
> of video files (wmv or flv mostly, the odd avi or mov or mkv or asx too),
> feeds them to "mplayer -vo null -nosound -msglevel all=4 -frames 1" which
> processes the file and prints out a bunch of stuff including a line like
>
> VIDEO: [WMV3] 384x288 24bpp 1000.000 fps 396.8 kbps (48.4 kbyte/s)
>
> prints the name, then parses the lot to extract the kbps info and filename.
> The script then reassembles the stream as above, so kbps and the associated
> filename are on the same line. Only problem is for some files mplayer
> DOESN'T print that line, so I end up with
>
> name
> kbps name
> kbps name
> ...
>
> Not sure how to fix that without looping grep on every file's output.
> Maybe I can use a sed or awk program that checks for two consecutive
> filenames and discards the first?
>
> Here's the script:
>
> #! /bin/sh
> for item in "$@" ; do
> if [ -f "$item" ] ; then
> mplayer -vo null -nosound -msglevel all=4 -frames 1 "$item" 2>&1
> echo "VIDEO ( $item )"
> fi
> done | grep VIDEO | cut -f 2 -d '(' | cut -f 1 -d ')' | sed -e 's/^ *//'
> -e 's/\([^ ]*\) .*$/\1/' -e '$!N;s/\n/ /'
I get this kind of thing when processing customer mailing lists.
Sometimes they omit or add a field. I do it with PHP, but in essence the
answer is to count the number of fields, and then branch based on the
count.
Paul
-- Paul M. Foster ----------------------------------------------------------------------- This list is provided as an unmoderated internet service by Networked Knowledge Systems (NKS). Views and opinions expressed in messages posted are those of the author and do not necessarily reflect the official policy or position of NKS or any of its employees.
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