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You mean something like:
awk '($0 ~ /^1234/){S=$0;getline;print S $0;S="";next} 1' test199 > x$$ && cp x$$ test199; rm -f x$$

Hello Sandeep_sandy,

Welcome to forum, kindly use code tags for commands/codes/Inputs you are using in your posts, following may help you in same.
Let's say we have following input file then:
...