sed — Stream editor (text transformation) for AmigaOS

Original author: Diomidis Spinellis / University of California, Berkeley
Ported by Duncan Bowring using amiport (AI-assisted porting toolkit).
Project: https://github.com/bdgscotland/amiport

Cross-compiled with m68k-amigaos-gcc for AmigaOS 3.x (68000+).
Tested in vamos emulator.

Usage:
  sed 's/old/new/' file.txt          Substitute first match per line
  sed 's/old/new/g' file.txt         Substitute all matches
  sed -n '10,20p' file.txt           Print lines 10-20
  sed '/pattern/d' file.txt          Delete matching lines
  echo "hello" | sed 'y/helo/HELO/'  Transliterate characters
  sed -e 's/a/A/' -e 's/b/B/' file   Multiple expressions

Exit codes (Amiga-native):
  0  = success (RETURN_OK)
  10 = error (RETURN_ERROR)

Note: In-place editing (-i) is not supported on AmigaOS (no fdopen).

Includes full source code (original POSIX and ported Amiga versions)
and PORT.md documenting every transformation applied.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
-rw-r--r--     0/0        3527    7786  45.3% -lh5- 3a28 Mar 22 21:31 PORT.md
-rw-r--r--     0/0        3856   17211  22.4% -lh5- 10a2 Mar 22 21:31 TEST-REPORT.md
drwxr-xr-x     0/0           0       0 ****** -lhd- 0000 Mar 22 21:31 original/
-rw-r--r--     0/0        6804   20316  33.5% -lh5- 1a84 Mar 22 21:31 original/compile.c
-rw-r--r--     0/0        2004    4288  46.7% -lh5- cad5 Mar 22 21:31 original/defs.h
-rw-r--r--     0/0        1334    2790  47.8% -lh5- f391 Mar 22 21:31 original/extern.h
-rw-r--r--     0/0        4302   12092  35.6% -lh5- de7c Mar 22 21:31 original/main.c
-rw-r--r--     0/0        1479    3298  44.8% -lh5- ebc2 Mar 22 21:31 original/misc.c
-rw-r--r--     0/0        5313   14789  35.9% -lh5- b19c Mar 22 21:31 original/process.c
drwxr-xr-x     0/0           0       0 ****** -lhd- 0000 Mar 22 21:31 ported/
-rw-r--r--     0/0        1808    4480  40.4% -lh5- 8175 Mar 22 21:31 ported/compat.h
-rw-r--r--     0/0        6987   20852  33.5% -lh5- 7248 Mar 22 21:31 ported/compile.c
-rw-r--r--     0/0        2102    4456  47.2% -lh5- 226e Mar 22 21:31 ported/defs.h
-rw-r--r--     0/0        1370    2809  48.8% -lh5- 9dd2 Mar 22 21:31 ported/extern.h
-rw-r--r--     0/0        4911   13660  36.0% -lh5- 815f Mar 22 21:31 ported/main.c
-rw-r--r--     0/0        1736    4045  42.9% -lh5- fcd4 Mar 22 21:31 ported/misc.c
-rw-r--r--     0/0        6184   17237  35.9% -lh5- 707b Mar 22 21:31 ported/process.c
-rw-r--r--     0/0       34301   64080  53.5% -lh5- 5b8c Mar 22 21:31 sed
-rw-r--r--     0/0         670    1254  53.4% -lh5- 8bbd Mar 22 21:31 sed.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        19 files   88688  215443  41.2%            Mar 22 23:49