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LHA Archiver
... New Development of the LHA Packer / Archiver for Classic Amiga (2026) ...
... modern redevelopment of the classic packer with updates, bug fixes and improvements ...
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This archive contains a new version of the Amiga LHA program, the ubiquitous archiving program that defines Aminet's most well-known distribution format.
Since versions 1.x and 2.x are no longer maintained, it was necessary to start from scratch and offer an updated version.
Although the 40.x series of Lha is fully compatible with the 1.x and 2.x series, it is not based on them. It merely implements the same format and recognizes the same command-line options.
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New Features:
- Lha can now archive soft and hard links. A new command-line option, -Ql, specifies how these should be handled.
- Lha can now create self-extracting archives using the new command-line option -Qx.
- Lha no longer blocks the iconification of its shell window.
- Lha no longer requires huge stack sizes. The default stack size of 4K is completely sufficient.
- Compression and extraction speeds have been improved.
- Lha can be made resident (it is "pure").
If you want to use the -Qx option to create self-extracting archives, make sure that Lha is also located in the C: directory, since it needs to parse its own binary file.
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Limitations:
- This version of Lha requires OS 2.04 or later.
- The -w option ("Set working directory") is no longer supported.
- The -lh2- and -lh3- compression formats are not included, since there isn't a single file on Aminet packed in those formats, and since they do not offer better compression.
-lh0- (no compression), -lh1- (the old LZH format), and -lh4- through -lh7- are supported.
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Installation:
- Copy the Lha binary file to any location.
Preferably to C: if you want to make Lha resident and use the -Qx option.
- Copy the instructions to any location.
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Amigashell Options:
LhA Version Lha 40.xx
Copyright 2026 by THOR Software, Thomas Richter
Usage: LhA [-<options>] [@file] <command> <archive> [[homedir]
<filespec>...] [destdir]
Where <command> is one of:
a Add files c Concatenate/Append archives
d Delete files e Extract files
f Freshen files h Hunt for diffs arc <-> filesys
l[q] List archive (terse) m Move files to archive
p Print files to stdout r Replace files
t Test archive integrity u Update archive
v[q] List archive (verbose) vv Show archive contents (full)
x Extract files with full path y Copy archive with new options
and <options> is one or more of:
-a Preserve file attributes (D) -A Set archive attributes (D)
-b Set I/O buffer size (in KB) -B Keep backup of archive
-c Confirm files -C Clear arc-bit on extract (D)
-d Archive date = newest file -D Alternate progress display
-e Archive directories -E Touch extracted files
-f Ignore filenotes -F Use fast progress display
-G Only extract newer files -h Disable home directories
-H Write header level (0,1,2) -i Read file list from file
-I Ignore ENV:LHAOPTS -k Keep going on errors
-K Kill empty directories (move) -l Make file names lower case
-L Create file list -M No messages for query
-M No autoshow files -N No byte progress indicator
-N No progress indicator -o On or after date (newer than)
-O On or before date (older than) -P Pause after loading
-P Set task priority -q Be quiet
-Q Alternate option set introducer -r Collect files recursively
-R Collect archives recursively -s Only add files with A flag unset
-S Set A flag on added files -t Only extract new files
-T Only extract new & newer files -u Make file names upper case
-V Enable/set multivolume size(KB) -W Exclude file names
-x Preserve and use path names -X Do not append LZH/LHA suffix
-y Always append LZH/LHA suffix -Y Store big files w. <3% gain
-z Do not compress files -Z Compress archives
-0 Use LhArc V1.x compression -2 Use LhA V2.x compression (-lh5-)
-3 Use LhA V2.x compression (-lh6-) -4 Use LhA V2.x compression (-lh7-)
Alternate options:
-0a Use simple console I/O -0A Store Amiga attributes literally
-0b Test archive before extract -0d Delete autoshow files
-0h Set Huffman buffer size (KB) -0l Control archival of links
-0m Truncate to console width -0n Use Latin1 conversion (D)
-0o Ignore options after cmd -0p Ignore delete protection flag
-0q Quick add -0r Skip date stamp check
-0v Set multivolume archival device -0w Disable wildcards
-0x Create self-extracting archive
Options are case sensitive and may be specified anywhere on the command
line, the option letter followed by a 0 disables the option, any non-zero
digit will enable it. If no digit follows the option letter, it will be
enabled. Some options are enabled by default (depending on used command),
the default compression is LhA V2.x-style (-lh5-) compression. For more
information please consult the users' manual.
The destination directory must have a trailing slash or colon (:).
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About LhA:
LhA is based on the LHA format, which Haruyasu Yoshizaki developed in 1988 under the name LHarc-originally for MS-DOS. The format combines LZSS compression with Huffman coding and quickly gained popularity worldwide.
In late 1991, Stefan Boberg ported the program to the Amiga¿optimized in 68000 assembly language and with Amiga-specific extensions. This version became the de facto standard on the Amiga and the preferred archiving method on Aminet.
Further development was handled by Jim Cooper, David Tritscher, and Sven Ottemann.
In 2026, Thomas Richter released a completely rewritten version of LHA to modernize the program and fix outstanding bugs.
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Free for users; commercial users, please inquire. For details, see lha.readme and lha.guide.
LHA 2026 © Thomas Richter
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