Hi Folks,

Is there a way to insert a string of text in a database list by first locating a specific word and then inserting (or appending) a string every 3rd line after it. I've tried it with sed with limited success. The "word appears in several blocks of text; I wish to insert the string in each block on the 3rd line.

Thanks for your help in advance.

How are you defining a "block" of text? Do you want to modify only every 3rd line?

You might want to submit a sample file.

Hi Nils,

Yes, here's an example. I'm trying to locate the word "Word1" for each block as such:

Word1 AAAAAAAAAAAAAA {
BBBBBBBBBBBBBB
CCCCCCCCCCCCCC
DDDDDDDDDDDDDD
}

Word1 BBBBBBBBBBBBB {
ZZZZZZZZZZZZZ
WWWWWWWWWWWWW
QQQQQQQQQQQQ
}

Word12 AAAAAAAAAAAAA {
BBBBBBBBBBBBB
CCCCCCCCCCCCC
DDDDDDDDDDDDD
}

I would like locate each block above by the word "Word1" and then insert a string of text (Ts) in the 4th line of each block as such:

Word1 AAAAAAAAAAAAAA {
BBBBBBBBBBBBBB
CCCCCCCCCCCCCC
DDDDDDDDDDDDDD
TTTTTTTTTTTTTT
}

Word1 BBBBBBBBBBBBBB {
ZZZZZZZZZZZZZZ
WWWWWWWWWWWWWW
QQQQQQQQQQQQQQ
TTTTTTTTTTTTTT
}

Thanks for your help.

I'm trying to identify a pattern. Does 'Word1' always start at the beginning of the line in line 1 of the block?

Can we search just for 'Word1' at the beginning of the line and not worry about whether it's the first line of the block?

Yes, the word "word1" starts at the beginning of each block (as a reference point). From the reference point one, a string is inserted on the 4th line within the "{ }". The reason for this is that there are other blocks that start with a "word" and a number, like word12, word45, wordxy, etc. I want to target a specific word, in this case "word1".

Thanks.

Here's an awk script that prints the line of TTTs after the 4th line if the beginning of the line matches "Word1":

#!/bin/ksh

awk ' BEGIN { allt="TTTTTTTTTTTTTTTTT"; cnt=0; prn=0 }
{
if($0 ~ /^Word1/)
prn=1

if(prn == 1)
cnt++

printf("%s\n", $0)
if(prn == 1 && cnt == 4)
{
prn=0
cnt=0
printf("%s\n", allt)
}

} ' datafile.txt > newdatafile.txt

Nils,

It's perfect!

Thanks a bunch....