2. Action and Command Name

ebzip has three action modes; compression, uncompression and information.

• compression
  Compress a CD-ROM book.

• uncompression
  Uncompress a CD-ROM book compressed by ebzip.

• information
  Output information about compression status of a CD-ROM book compressed by ebzip.

When ebzip is invoked, the action is determined by invoked name of the ebzip command and command line options to ebzip. The action is never changed during an execution of ebzip.

ebzip has installed with three different command names; ebzip, ebunzip and ebzipinfo. (On DOS and Windows systems, ebzipinfo is renamed to ebzipinf). Usually, they are hard-linked like as follows:

% ls -li ebzip ebunzip ebzipinfo 38787 -rwxr-xr-x 3 bin bin 73728 Jun 27 22:48 ebunzip 38787 -rwxr-xr-x 3 bin bin 73728 Jun 27 22:48 ebzip 38787 -rwxr-xr-x 3 bin bin 73728 Jun 27 22:48 ebzipinfo

When it is invoked as ebunzip, the default action is uncompression. When it is invoked as ebzipinfo, information is the default action. Otherwise, the default action is compression.

In addition, you can specify the action by the command line options; `--compress' (`-z'), `--uncompress' (`-u') and `--information' (`-i'). They are prior to invoked names. In the following example, "compress" is the action of all the lines:

ebunzip ebzip --uncompress ebzipinfo --uncompress