Shell Programming and Scripting

function setFieldsByWidth(   i,n,FWS,start,copyd0) {
  # Licensed under GPL Peter S Tillier, 2003
  # NB corrupts $0
  copyd0 = $0                             # make copy of $0 to work on
  if (length(FIELDWIDTHS) == 0) {
    print "You need to set the width of the fields that you require" > "/dev/stderr"
    print "in the variable FIELDWIDTHS (NB: Upper case!)" > "/dev/stderr"
    exit(1)
  }

  if (!match(FIELDWIDTHS,/^[0-9 ]+$/)) {
    print "The variable FIELDWIDTHS must contain digits, separated" > "/dev/stderr"
    print "by spaces." > "/dev/stderr"
    exit(1)
  }

  n = split(FIELDWIDTHS,FWS)

  if (n == 1) {
    print "Warning: FIELDWIDTHS contains only one field width." > "/dev/stderr"
    print "Attempting to continue." > "/dev/stderr"
  }

  start = 1
  for (i=1; i <= n; i++) {
    $i = substr(copyd0,start,FWS[i])
    start = start + FWS[i]
  }
}

#Note that the "/dev/stderr" entries in some lines have wrapped.

#I then call setFieldsByWidth() in my main awk code as follows:
BEGIN {
  #FIELDWIDTHS="7 6 5 4 3 2 1" # for example
  # adjust the FIELDWIDTHS values as you see fit.
  FIELDWIDTHS="9 21 51 11 51 11 51 11 51 11 9 9" # for example
  OFS="|"
}
!/^[  ]*$/ {
  saveDollarZero = $0 # if you want it later
  setFieldsByWidth()
  # now we can manipulate $0, NF and $1 .. $NF as we wish
  # print $0 OFS
  print $1,$2,$3,$4,$5,$6,$7,$9,$10,$11,$12
  next
}

{
f1=substr($1,1,9);
f2=substr($1,10,20);
f3=substr($1,30,50);
f4=substr($1,80,10);
f5=substr($1,90,50);
f6=substr($1,140,10);
f7=substr($1,150,50);
f8=substr($1,200,10);
f9=substr($1,210,50);
f10=substr($1,260,10);
f11=substr($1,270,8);
f12=substr($1,278,8);

OFS="|";
print f1,f2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12;
print "\n";
}

awk -f parse.awk filename.txt > FinalResult.txt