How to delete duplicated rows based in a column value?

Question

Given the following table

 123456.451 entered-auto_attendant
 123456.451 duration:76 real:76
 139651.526 entered-auto_attendant
 139651.526 duration:62 real:         


        

Answer 1

you didn't give an expected output, does this work for you?

 awk '!a[$1]++' file

with your data, the output is:

123456.451 entered-auto_attendant
139651.526 entered-auto_attendant
139382.537 entered-auto_attendant

and this line prints only unique column1 line:

 awk '{a[$1]++;b[$1]=$0}END{for(x in a)if(a[x]==1)print b[x]}' file

output:

139382.537 entered-auto_attendant