Shell Programming and Scripting

input='\x'94 #the new 1 byte hex change
offset=00000000 #the 1st offset of the difference 
patch 
unset input offset
input='\x'34 #the 2nd new 1 byte hex change
offset=00000001#the 2nd offset of the difference 
patch 
unset input offset
input='\x'03 #the 3rd new 1 byte hex change
offset=0000004C #the 3rd offset of the difference 
patch 
unset input offset

$ cat lewis.ksh
cmp -l lewis_1.txt lewis_2.txt |
awk -v Q="'" '
function oct2dec(o      ,i,d){
  for(i=1;i<=length(o);++i){
    d=(8*d)+substr(o,i,1);
  }
  return d
}
{
    offset = $1;
    old    = $2;
    new    = $3;
    printf "input=" Q "\\x" Q "%x" "\n", oct2dec(new);
    printf "offset=%08X\n", offset;
    print  "patch\nunset input offset"
}
'
$ cat lewis_1.txt
abcdefghij
klmnopqrst
$ cat lewis_2.txt
aBcdEFghij
klMnopqrst
$ cmp -l lewis_1.txt lewis_2.txt
     2 142 102
     5 145 105
     6 146 106
    14 155 115
$ ./lewis.ksh
input='\x'42
offset=00000002
patch
unset input offset
input='\x'45
offset=00000005
patch
unset input offset
input='\x'46
offset=00000006
patch
unset input offset
input='\x'4d
offset=0000000E
patch
unset input offset
$

cmp -l lewis_1.txt lewis_2.txt |
awk -v Q="'" '
function oct2dec(o      ,i,d){
  for(i=1;i<=length(o);++i){
    d=(8*d)+substr(o,i,1);
  }
  return d
}
{
    offset = $1 - 1;
    old    = $2;
    new    = $3;
    printf "input=" Q "\\x" Q "%x" "\n", oct2dec(new);
    printf "offset=%08X\n", offset;
    print  "patch\nunset input offset"
}
'