XPost: alt.lang.asm, comp.os.dos.programmer   
   From: admin@nospicedham.127.0.0.1   
      
   On Thu, 22 Dec 2022 20:44:02 +0000   
   "Kerr-Mudd, John"  wrote:   
      
   > On Sun, 18 Dec 2022 20:35:56 +0000   
   > Ahem A Rivet's Shot  wrote:   
   >   
   > > On Sun, 18 Dec 2022 19:26:37 +0000   
   > > "Kerr-Mudd, John"  wrote:   
   > >   
   > > > On Sun, 18 Dec 2022 18:34:01 +0000   
   > > > Ahem A Rivet's Shot  wrote:   
   > > >   
   > > > > On Sun, 18 Dec 2022 17:06:30 GMT   
   > > > > Charlie Gibbs  wrote:   
   > > > >   
   > > > > > On 2022-12-18, Charles Richmond  wrote:   
   > > > > >   
   > > > > > > I would have used "rot-13", but I'm *not* sure if folks know how to   
   > > > > > > use that anymore...   
   > > > > >   
   > > > > > Fbzr bs hf qb.   
   > > > >   
   > > > > Bayl fbzr ?   
   > > > >   
   > > >   
   > > > I wrote my own in asm;   
   > > > what a lookup table? much shorter:   
   > >   
   > > 	I use tr:   
   > >   
   > > $ more bin/rot13   
   > > #!/bin/sh   
   > > tr '[A-Za-z]' '[N-ZA-Mn-za-m]'   
   > >   
   > Did I reply here? not sure   
   > I have implemented a barebones tr for DOS that accepts ranges, so rot13   
   > jbexf. Luckily it also seems to work with or without the square brackets.   
   > 100 bytes (no error messages, and barely any^w^w no syntax checking).   
   >   
   > xpost to ala   
   >   
   >   
   Just here; (OK go on then, also xposted to clax and codp, xpost to afc   
   dropped)   
      
   tr.com:  uses DOS int 21 for fileIO   
      
   ->           d 100 l100   
   16AB:0100 BF 65 01 31-C0 99 AA FE-C0 75 FB BB-82 00 B0 20  .e.1.....u.....   
   16AB:0110 89 DF F2 AE-75 4E 89 FE-43 46 AA 31-FF 87 DE 92  ....uN..CF.1....   
   16AB:0120 3C 27 74 19-40 80 3C 2D-75 07 3A 44-01 76 03 46  <'t.@.<-u.:D.v.F   
   16AB:0130 46 AC 09 FF-75 E4 BF 65-01 01 C7 EB-E0 31 DB BA  F...u..e.....1..   
   16AB:0140 65 02 89 D6-89 F7 B9 9A-FD B4 3F CD-21 91 E3 14  e.........?.!...   
   16AB:0150 BB 65 01 51-AC D7 AA E2-FB 59 BB 01-00 B4 40 CD  .e.Q.....Y....@.   
   16AB:0160 21 4B EB DE-C3                                   !K...   
      
   Only example I've tested:   
      
   tr 'A-Za-z' 'N-ZA-Mn-za-m' {