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Nice...

# sed -n -e :x -e '/PATTERN.*/{;N;N;p;d;}' -e tx infile
PATTERN1
ppppapapappappapa
qmqkkqhqgqgqgqg
PATTERN2
FFFFD KKKKJ
MMMMMQQQQQQM
PATTERN3
MMMDDD
DDDDDDD
PATTERN4
RRRRRRRRR
FFFFF...

this will be output file ok :b:
at now can you write a little portion for your input file ?

Hi,

do you mean something like this:

sed -n '/^\(pattern1\|pattern2\|pattern3\|pattern4\)/{N;N;p}' file

HTH Chris

what is your desired output?

Hi.

Similar to that of Scrutinizer, but more explicit, and slightly less efficient (more division operations involving NR), but still a single pass over the data:
#!/usr/bin/env bash

# @(#)...

sed -n 'p;n;h;n;p;g;p'

Is this what you mean:
awk '(NR%3)==2{p=$0; getline; $0=$0 RS p}1' infile
output:
aaaaaaaaaa
cccccccc
bbbbbbbbb
aaaaaaaaaa
cccccccc
bbbbbbbbb

I'd first split the file after every 3 lines, like so:
split -l3 file
In this case 2 files are produced: xaa xab

for i in x*; do
awk 'NR == 1 { l1=$0 }
NR == 2 { l2=$0 }
NR == 3 {...

while read line; do
echo "$line" | grep "^$" >/dev/null 2>&1 && (echo; echo) || echo -n $line
done <file ; echo
<span class="time"><strong>06:00</strong></span>

<div class="cDesc"...

awk -vRS= '{gsub("\n","");print}' file

It's bash scripting so on the first line of the script you write #!/bin/bash If the path of your shell is /bin/bash, of course.
The full code :
#!/bin/bash
while read LINE
do
echo $LINE |...

try this
I=0
while read LINE
do
TEXT[$I]=$(echo $LINE | grep -o '<text>.*</text>' | sed -e 's/<text>//' -e 's/<\/text>//'
(( I ++ ))
done < $FILENAMEThat creates an array where each...