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Thank you for trying this port of UNZIP for VM/CMS and MVS!

                        Using under MVS:
                    -------------------------

1. To use the Info-ZIP's UNZIP under MVS you need:

   - C/370 ver 2.1 compiler or another compatible compiler supporting
     long names for function/variable names.

2. To compile the program under MVS do :

   - unzip all the files from unz54vm.zip file. They are stored as
     ASCII format so you have to unzip them first on PC or other
     system that already have UNZIP, and then upload them to the
     mainframe with ASCII to EBCDIC conversion.

   - Copy all the .C files in the PDS called USERID.UNZIP.C

   - Copy all the .H files in the PDS called USERID.UNZIP.H

   - adjust the job UNZMVSC.JOB to work on your site. Change USERID
     to your userid.  You might need to change the CEE dataset names
     to match your OS/390 system.

   - Preallocate PDS datasets named: USERID.UNZIP.OBJ and
     USERID.UNZIP.LOAD

   - execute the job UNZMVSC to compile and link all the sources.

   - if everything is ok you will get an UNZIP MODULE

3. Using UNZIP

   - Just read the UNZIP.TXT

   - A few exceptions concerning MVS

     3.0. There are different ways to invoke UNZIP.

        - allocating UNZIP.LOAD dataset to your ISPLLIB if you
          want to invoke UNZIP under ISPF.
          Then just type UNZIP ...parms... to get it work

        - You can also call it directly with :
             TSO CALL 'userid.UNZIP.LOAD(UNZIP)' '...parms...'
             (notice to quotes!)

        - You can even call it from a batch job like:

          //MYZIP    JOB  (account)
          //STEP1    EXEC PGM=UNZIP,PARM='-l mytestz.zip *.c'
          //STEPLIB  DD DSN=userid.UNZIP.LOAD,DISP=SHR
          //SYSPRINT DD SYSOUT=*

          This will list all the .c files from the zip file mytestz.zip

     3.1. If the ZIP file has been zipped on an ASCII based system
          it will be automatically translated to EBCDIC
          ( I hope I got all those translation tables OK :-).
          You can force ASCII to EBCDIC conversion with the -a flag.

     3.2. The date/time of the output files is set to the
          current system date/time - not according the date/time in
          the zip file.

     3.3. You can even unzip using TSO/E PIPELINES
          so unzip can be used as pipeline filter:

          'pipe cms unzip -p test.zip george.test | count lines | cons'
          ( we do also a lot of pipethinking here ;-)

     3.4. If you got also the ZIP program (see ZIP21VM.ZIP) you can
          do zipping and unzipping without translating to ASCII
          the ZIP also preserves the file informations (LRECL,BLKSIZE..)