Piero Steffano Del Aguila Macher

To remove duplicates in linux you can use awk command as follows:  awk -F- '!seen[$1]++' file.txt > output.txt where: -F is paraeter to deternime separator used to define columns and in ths case the dash 8-) is the sparator used '!seen[$1]++' is the expression used for the line in order to be printed > is the instruction to send command output o a file