Hi
I need to be search a file of fixed length records and when I hit a particular record that match a search string, substitute a known position field
In the example file below
FHEAD000000000120090806143011
THEAD0000000002Y0000000012 P00000000000000001234
TTAIL0000000003
THEAD0000000004Y0000000044 N00000000000000001299
TTAIL0000000005
I need to only consider the THEAD records and swap the Ps to Ns, and visa versa, in position 40,
Thanks in advance