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How to insert line with between two consecutive lines that match special pattern?

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# 1  
Old 05-17-2012
How to insert line with between two consecutive lines that match special pattern?
I have following pattern in a file:

Code:
00:01:38 UTC  
abcd
00:01:48 UTC
00:01:58 UTC
efgh
00:02:08 UTC
00:02:18 UTC

and I need to change something like the following

Code:
00:01:38 UTC  
abcd
00:01:48 UTC
XXXX
00:01:58 UTC
efgh
00:02:08 UTC
XXXX
00:02:18 UTC

What would be the best way of doing it?

Thanks
Moderator's Comments:
Mod Comment Code tags for code, please.
Last edited by Corona688; 05-17-2012 at 12:43 PM..
# 2  
Old 05-17-2012
What the 'best' way is to do something is always open to debate, but you can do this using awk:

Code:
awk -v ADD="XXXX" -v PATTERN="[0-9][0-9]:[0-9][0-9]:[0-9][0-9] UTC" 'L { print L; if((L ~ PATTERN) && ($0 ~ PATTERN)) print ADD }; { L=$0 } END { print L }' inputfile > outputfile

Hopefully simple to modify to your exact needs by altering ADD and PATTERN.
# 3  
Old 05-17-2012
Code:
awk 'BEGIN{pat="^[0-9][0-9]:[0-9][0-9]:[0-9][0-9]( UTC)?$"} {if($0 ~ pat) {getline l; if(l ~ pat) print $0 RS "XXXX" RS l; else print $0 RS l} else print}' infile > outfile

# 4  
Old 05-17-2012
Corona688,

Thanks a lot for the quick response. Works like a charm!
# 5  
Old 05-17-2012
Code:
awk '{if ($1~/^[0-2][0-9]:[0-5][0-9]:[0-6][0-9]$/){if(p)print "XXXX"; p=1}else p=0}1' infile

Last edited by Scrutinizer; 05-17-2012 at 02:20 PM..
# 6  
Old 05-18-2012
Code:
sed -n '
/^[[:digit:]]/ {
p
n
/^[[:digit:]]/ {
i \
XXXXXX
p}
}
/^[^[:digit:]]/ p' filename

# 7  
Old 05-21-2012
Try as..
Code:
[mkt@michael]$ sed '/UTC$/{
> $!{
> N;/UTC$/s/\(.*\)\n\(.*\)/\1\nXXX\n\2/
> }
> }
> $s/.*/XXX\n&/' filename

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