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3) ARC
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Creating an Archive.
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arc/c <[d:]arcfile[.arc]> <[s:]pattern> [[s:]pattern]]
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arc/cx <[d:]arcfile[.arc]> <[s:]pattern> [[s:]pattern]]
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Creates an archive on drive d: named "arcfile.arc". As
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many as eight patterns may be given. The possible
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values for x are:
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n - no compression; store only
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p - pack only
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s - squeeze only
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q - squash only
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c - crunch only (two passes)
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1 - crunch only (one pass)
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If you choose option x=1 then part of the information
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that ARC needs to unarchive the file must be stored at
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the end of the archive entry rather than the beginning.
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In particular, this is the files original length and
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the checksum.
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Unfortunately, ARC needs to know a relative file's
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length when it is at the start of the archive entry so
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that disk space can be properly allocated. Therefore
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ARC will not allow the single pass crunch option for
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relative files. If you do select x=1 when archiving a
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group of files, any relative files encountered will be
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processed as if you had chosen x=c.
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ARC VERSION 2.20 PAGE - 20
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Some examples:
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arc/c a:sq b:sq.* b:usq.*
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This example creates an archive named "sq.arc" on
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drive a: which includes all files from drive b: whose
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names begin with "sq." or "usq."
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arc/cs a:test.arc f:*
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Archives all files from drive 10,1 to "test.arc" on
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drive 8,0 and squeezes all entries.
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arc/c seq b:*=s
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Archives all sequential files on drive b: to
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"seq.arc" on the default drive.
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Previous versions of ARC would allow you to encrypt an
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archive by specifying a password when creating an archive.
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Unfortunately, this creates a number of problems when
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crunching files and had to be eliminated. Besides, we never
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used it anyway. Did anybody else?
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ARC VERSION 2.20 PAGE - 21
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Appending to an Existing Archive.
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arc/a[x] <[d:]arcfile[.arc]> <[s:]pattern> [[s:]pattern]]
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This command is exactly the same as the create
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archive command, and all of the above examples apply.
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The only difference is that the archive file must
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exist, and the new entries are appended to it.
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If the archive does not exist, a file not found
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message is issued and the program aborts.
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Sometimes the number of blocks displayed on a
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directory listing does not agree with ARC after an
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append. This is a bug in Commodore DOS, and should be
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harmless. Oddly enough, if you try to fix this by
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validating the disk, you will be wasting your time
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since the directory block count will not be affected.
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Since ARC can handle any archive created by lower
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versions of ARC, it is ok to append to a version 1
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archive.
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You should exercise some caution when appending to
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archives. Every archive must be an integer multiple of
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