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Hi,

Try this one,

awk '{k=substr($0,1,8);if(a[k]){a[k]=k"00";next;}a[k]=$0;}END{for(i in a)print a[i];}' file

Cheers,
Ranga:-)

Try:awk '{a[substr($0,1,8)]++;b[substr($0,1,8)]=$0}END{for (i in a){if (a[i]>1) {print i"00"}else print b[i]}}' file