Shell Programming and Scripting

Hi,

Can anybody help me how to add a word in front of a line in a file.Actually it is bit tricky to add a word. i will give a sample for this:

Input :

1110001 ABC DEF
1110001 EFG HIJ
1110001 KLM NOP
1110002 QRS RST
1110002 UVW XYZ

Output:
%HD% 1110001 ABC DEF
%DT% 1110001 EFG HIJ
%DT% 1110001 KLM NOP
%HD% 1110002 QRS RST
%DT% 1110002 UVW XYZ

you see...i need to add %HD% for a unique number when it encounters in each line and then successvely add %DT% till another unique number encounters.

Please help me to meet this requirement.

Thanks in advance.

Best Regards,
Neeraj

What have you tried so far?

Regards

Actually i am a newbie, so could go so far ....
but i was thinking to add first %HD% for all unique numbers as soon as they encounter and in second phase to add %DT% everywhere else.

This is what i was logically derived because in one go it is difficult to find the answer for me.

Thanks for your reply.

Neeraj

Should be something like this:

Code:

awk '!a[$1]++{print "%HD%", $0; next}{print "%DT%", $0}' file

Regards

Thank you very much...It worked fine.....