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README
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1994-06-23
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vms/README for UnZip 5.11 and later, 23 Jun 94
----------------------------------------------
Notes about using UnZip and zipfiles under VMS (see INSTALL for instructions
on compiling):
- Install UnZip as foreign symbol by adding this to login.com:
$ unzip == "$disk:[dir]unzip.exe"
$ zipinfo == "$disk:[dir]unzip.exe -Z"
where "disk" and "dir" are location of UnZip executable; the "$" before
the disk name is important. Some people, including the author, prefer
a short alias such as "ii" instead of "zipinfo"; edit to taste.
- After proper installation, UnZip is invoked just as in Unix or MS-DOS:
"unzip -opts archive files". The hyphen ('-') is the switch character,
not the slash ('/') as in native VMS commands. A portable tool can be
designed to operate like the native programs on every system, or it can
be designed to operate consistently across all systems; Info-ZIP has
chosen the latter course. At some future date we may add support which
allows the user (or installer) to choose native look-and-feel over Info-
ZIP look-and-feel, but this is not a priority...
- VMS (or the C compiler) translates all command-line text to lowercase
unless it is quoted, making some options and/or filenames not work as
intended. For example:
unzip -V zipfile vms/README
is tranlated to
unzip -v zipfile vms/readme
which may not match the contents of the zipfile and definitely won't
extract the file with its version number as intended. This can be
avoided by enclosing the uppercase stuff in quotes:
unzip "-V" zipfile "vms/README"
Note that quoting the whole line probably won't work, since it would
be interpreted as a single argument by the C library.
- Wildcards which refer to files internal to the archive behave like Unix
wildcards, not VMS ones. This is both a matter of consistency (see
above) and power--full Unix regular expressions are supported, so that
one can specify "all .c and .h files which start with a, b, c or d and
do not have a 2 before the dot" as "[a-d]*[^2].[ch]". Of course, "*.[ch]"
is a much more common wildcard specification, but the power is there if
you need it. Note that "*" matches zipfile directory separators ('/'),
too. If UnZip was compiled with VMSWILD defined (do "unzip -v" to check),
the single-character wildcard is "%" rather than "?".
- Created files get whatever permissions were stored in the archive (mapped
to VMS and/or masked with your default permissions, depending on the
originating operating system), but created directories additionally in-
herit the (possibly more restrictive) permissions of the parent directory.
And obviously things won't work if you don't have permission to write to
the extraction directory.
- When transferring files, particularly via Kermit, pay attention to the
settings! In particularly, zipfiles must be transferred in some binary
mode, which is NOT Kermit's default mode, and this mode must usually be
set on BOTH sides of the transfer (e.g., both VAX and PC). See the notes
below for details.
From Info-ZIP Digest (Wed, 6 Nov 1991), Volume 91, Issue 290:
Date: Tue, 5 Nov 91 15:31 CDT
From: Hugh Schmidt <HUGH@macc.wisc.edu>
****************************************************
*** VMS ZIP and PKZIP compatibility using KERMIT ***
****************************************************
Many use Procomm's kermit to transfer zipped files between PC and VMS
VAX. The following VMS kermit settings make VMS Zip/UnZip compatible
with PC Zip/UnZip or PKZIP/PKUNZIP:
VMS kermit Procomm kermit
------------------- --------------------
Uploading PC zipfile to VMS: set file type fixed set file type binary
Downloading VMS zipfile to PC: set file type block set file type binary
"Block I/O lets you bypass the VMS RMS record-processing capabilities
entirely", (Guide to VMS file applications, Section 8.5). The kermit
guys must have known this!