The documentation says there should be default output.
ALTER TYPE varlist([input format = ] {output format }) [varlist...]
. . .
[/PRINT {[ALTEREDTYPES**] [ALTEREDVALUES]}]
{NONE }
** Default if subcommand omitted.
But the command
ALTER TYPE ALL (A=AMIN) /PRINT.gets this error
Warnings
Subcommand PRINT is empty.
Execution of this command stops.
The workaround is
ALTER TYPE ALL (A=AMIN) /PRINT ALTEREDTYPES ALTEREDVALUES.Demo_Alter_Type_error.sps
example.csv
Alter_Type.spv
Art Kendall
Social Research Consultants