If you're ok with dealing with header indexes instead of header names, the above the be reduced to a single command: 

csv
   in => \*ARGV,
   out => \*STDOUT,
   after_parse => sub { $_[1]->@* = $_[1]->@[ 1, 0, 3, 2 ] };

[download]

The whole thing as a one-liner: 

perl -MText::CSV_XS=csv -e'csv in => \*ARGV, out => \*STDOUT, after_pa
+rse => sub { $_[1]->@* = $_[1]->@[1,0,3,2] }' a.csv

[download]

In reply to Re^2: How to swap columns in a csv file ? by ikegami
in thread How to swap columns in a csv file ? by xuo

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