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# To figure out duplicat values in a column and extract those rows | |
awk 'BEGIN { FS="," } { c[$2]++; l[$2,c[$2]]=$0 } END { for (i in c) { if (c[i] > 1) for (j = 1; j <= c[i]; j++) print l[i,j] } }' file.csv | |
# replace $2 to which ever column you want to look for duplicates | |
# Same above code with more comments | |
BEGIN { FS = ";" } | |
{ | |
# Keep count of the fields in second column | |
count[$2]++; | |
# Save the line the first time we encounter a unique field | |
if (count[$2] == 1) | |
first[$2] = $0; | |
# If we encounter the field for the second time, print the | |
# previously saved line | |
if (count[$2] == 2) | |
print first[$2]; | |
# From the second time onward. always print because the field is | |
# duplicated | |
if (count[$2] > 1) | |
} |
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