For a list of commands, please refer to the executable. It will display a list of valid commands and modifiers if you omit any parameter.
x,e
EXtract from archive
l,v
List / Verbose List
u
Update newer files to archive
d
Delete from archive
m
Move to archive (means 'ad')
c re-Construct new archive
p Print to STDOUT from archive
t Test file CRC in archive
v verbose
n not execute
f force (over write at extract)
t FILES are TEXT file
o use LHarc compatible method (a/u)
w=<dir> specify extract directory (x/e)
d delete FILES after (a/u/c)
i ignore directory path (x/e)
z files not compress (a/u)
g [Generic] format (for compatibility)
0/1/2 header level (a/u)
e TEXT code convert from/to EUC
y filename multibyte convert
This manpage is poor, it really should be improved, but the original is in Japanese.
Try lha without any command line arguments to get help