sed command applicable?

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# 1  
Old 11-20-2001
Question sed command applicable?

Find the messages with BLUE header, collect the telno, and dump to a file.

file below:

header 1 BLUE 11/20/01
body telno 555
body room1
trailer 1 xxx

header 2 BLUE 11/20/01
body telno 444
body room2
trailer 2 xxx

header 3 RED 11/20/01
body telno 666
body room3
trailer 3 xxx

header 4 BLUE 11/20/01
body telno 333
body room4
trailer 4 xxx

header 5 YELLOW 11/20/01
body telno 222
body room5
trailer 5 xxx

The objective is to collect all the telephone numbers (telno) within the messages with BLUE header. Is there a way using sed to filter the output utilizing the header (BLUE) parameter?

Output file:

telno 555
telno 444
telno 333

This is work-related, not a homework. Thanks.
# 2  
Old 11-21-2001
Are you using GNU utilities? If so, it's as easy as:
grep -A1 BLUE input-file | grep telno | awk '{print $2" "$3}' >output-file

If not, please post back the results of `uname`. It may be easier to help...
# 3  
Old 11-21-2001
Try this script:
#! /usr/bin/sed -nf
/BLUE/ { N
         s/body *\(telno *[0-9]*\)/\1/p

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