@t{pspp-convert -@w{-}version}
@end display
-The format of @var{Iinput} is automatically detected, when possible.
+The format of @var{input} is automatically detected, when possible.
The character encoding of old SPSS system files cannot always be
guessed correctly, and SPSS/PC+ system files do not include any
indication of their encoding. Use @code{-e @var{encoding}} to specify
SPSS portable file.
@end table
+As a special case of format conversion, @command{pspp-convert} can
+decrypt an encrypted SPSS system file. Specify the encrypted file as
+@var{input}. The output will be the equivalent plaintext SPSS system
+file. You will be prompted for the password (or use @option{-p},
+documented below).
+
Use @code{-O @var{extension}} to override the inferred format or to
specify the format for unrecognized extensions.
The following options are accepted:
-@table @code
+@table @option
@item -O @var{format}
@itemx --output-format=@var{format}
Specifies the desired output format. @var{format} must be one of the
interpreted. This option is necessary because old SPSS system files,
and SPSS/PC+ system files, do not self-identify their encoding.
+@item -p @var{password}
+@item --password=@var{password}
+Specifies the password to use to decrypt an encrypted SPSS system
+file. If this option is not specified, @command{pspp-convert} will
+prompt interactively for the password as necessary.
+
+Be aware that command-line options, including passwords, may be
+visible to other users on multiuser systems.
+
@item -h
@itemx --help
Prints a usage message on stdout and exits.