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perl -ne 'BEGIN {$col=1}' -e 's/\r?\n//; @F=split /\t/, $_; $sum += $F
+[$col]; 
END {warn "Sum of column $col for $. lines\n"; print "$sum\n"}' file.t
+ab

perl -e 'BEGIN {$col=1}' -lane '$sum += $F[$col]; 
          END {print "Sum of column $col for $. line: $sum"}' file.tab

perl -lane '$sum += $F[1]; END {print $sum}' file.tab