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70 lines
2.8 KiB
Plaintext
70 lines
2.8 KiB
Plaintext
Acorn-specific usage instructions
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As zipfiles can come from a variety of sources apart from Acorn machines,
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consideration had to be given to the handling of dot-extensions, e.g.
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"DOSFILE.TXT", "unix-filename.tar.gz". These are extracted as "DOSFILE/TXT"
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and "unix-filename/tar/gz"; their names may or may not be truncated,
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depending on where the files are being created: what filing system and, for
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Filecore-based filing systems such as ADFS or an IDEFS or SCSIFS, which
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disk/partition format (names will not be truncated if you're using E+ or F+).
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Where truncation occurs, you must be REALLY careful about extracting files
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from archives. The files
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dummy_source.c and dummy_source.h
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will both be extracted as
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dummy_sour
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UnZip will prompt you for confirmation of the over-writing of these files,
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but you must be really careful unless you wish to lose files! Also, because
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UnZip is a unix-ported program, the filenames are CASE SENSITIVE.
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*unzip new/zip newfile
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will extract 'newfile', but not 'NewFile', 'NEWFILE' or any other
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combinations. However, you can use the -C option to force operations to
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disregard the case of filenames.
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The Acorn UnZip port has an additional feature to cope with the extraction of
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files containing 'c' code. As you may be aware, Acorn Desktop C requires all
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files called "foo.c" to be renamed to "c.foo", ie "foo" in a directory called
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"c".
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There are two ways of using this feature.
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- The old way: use a colon-separated environment variable named "Unzip$Exts".
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Any extensions found in this variable will be extracted to directories
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named after the extension, with the extension stripped. For example:
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*Set Unzip$Exts "c:h:o:s"
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*unzip foo/zip
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- The new way: use the -/ option. For example:
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Any extensions found in the parameter for this option will be extracted to
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directories named after the extension, with the extension stripped. For
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example:
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*unzip -/c:h:o:s foo/zip
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If foo/zip contains a file named "foo.c", this file will be written as "foo"
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in directory "c". This can be used to include "c:h:o:s:txt" to pull all the
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text files out to a separate directory.
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UnZip fully supports SparkFS Extra Field. This means that zipfiles created
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with SparkFS or Zip (on RISC OS) will be correctly unzipped, including
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filetypes.
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UnZipSFX can be used to create self-extracting archives. To use it, just
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create a common zipfile using Zip (or SparkFS), then load the UnZipSFX
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executable into an editor (eg. Edit, Zap), go with the caret the end of the
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file (using CTRL-CursorDown) and drag the zipfile to the editor window (in
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other words, append the zipfile to the UnZipSFX executable). Now, saving the
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resulting file (with filetype Absolute (&FF8)), you have a self-extracting
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archive (ie. double-clicking on it will unzip the contents of the original
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zipfile to the currently selected directory).
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