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Forum: Shell Programming and Scripting 03-08-2013

Match ids and print original file

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$ awk ' NR == FNR && NR > 1 { arr[$2]=$3; next }...

$ awk ' NR == FNR && NR > 1 { arr[$2]=$3; next } FNR>1{ printf("%s",$0); if(arr[$2] == ""){ print " NULL"}else{print " "arr[$2]} } ' freq orig
chr1 879108 NULL
chr1 881918 0.007
chr1 896874 NULL

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