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Forum: Shell Programming and Scripting 11-26-2012

Merge multiple lines in same file with common key using awk

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Try awk -F "," 's != $1 || NR...

Try

awk -F "," 's != $1 || NR ==1{s=$1;if(p){print p};p=$0;next}
{sub($1,"",$0);p=p""$0;}END{print p}' file

Forum: Shell Programming and Scripting 11-26-2012

Merge multiple lines in same file with common key using awk

30,756

Posted By

Assuming that the first occurrence of the whole...

Assuming that the first occurrence of the whole second field is at the second-field:
awk -F, 'NR!=1 && p1!=$1{print prev;prev=""}
{p1=$1;prev=(prev"")?prev FS substr($0,index($0,$2)):$0}...

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