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Many thanks, ahamed! I appreciate your sticking with me to find the real problem. Your patience is apreciated..:b:

That works perfectly. How do I incorporate that into a working script?

---------- Post updated at 02:21 AM ---------- Previous update was at 02:14 AM ----------

Here's the output of the script...

The commands are in a file called 't3'. Here's the contents:
#!/bin/sh -xv
AAA=G
sed "/'FUE.SER' 5/,/ 0 0/ {/FUE.SER/{n}; s/F/$AAA/g}"

I invoke it like this:
./t3 <input

I'm running...

when I try your suggestion, I get the result:
'FUE.SER' 5
0502 G G
0302 E0502 GG
0504 E0503 E0301 E0201 E0302 E0504 G
0403 G0203 G
0506 E0505 E0303 E0204 E0304 E0506 G
0304 E0508 GG...

Hi ahamed,
Yes, like that. But the range is in the middle of a file of hundreds of lines. So, I need the range construction.
/FUE\.SER/,/0 0/
And, I don't want to modify the line
'FUE.SER' 5...

I'm trying to change "F" to "G" in lines after the first one:
'FUE.SER' 5
1 1 F0501 F0401 F0502
2 1 F0301 E0501 F0201 E0502 F0302
3 1 F0503 E0503 E0301 E0201 E0302 E0504...