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- Chop v0.92 by Terry Brown, 1990,1991
-
- Chops up files into smaller parts, in a variety of ways.
-
- Briefly -
-
- Chop filename [-sn] [-bn] [-cn] [-Bs|-As] [-in] [-Ps] [-p]
-
- -sn skip first n bytes, start from start if omitted
- -bn take only n byte chunks, take remainder of file if omitted
- -cn take only n chunks, take chunks to end of file if omitted
- -Bs after taking -bn bytes, take bytes until string s is reached
- -As after taking -bn bytes, take bytes until end of string s is reached
- -in buffer size n kilobytes, default 40, needs two of them
- -Ps string s is path and file name for output
- -p prompt before writing each file
-
- s must contain no spaces, ? matches anything, and `hh is a hex constant
-
- watch for shells which pre-expand wild cards etc.
-
- Eg. Chop dh0:bigText -b10000 -B`0A`20 -Pdf0:textBit -p
-
- breaks bigText into roughly 10000 byte pieces before lines starting with a
- space, saving them to df0:textBit.001, df0:textBit.002 etc., and giving you
- a chance to change disks before each write.
- (`0A`20 is hex for newline + space)
-
- This program will drop the first n bytes of a file, cut a file into n byte
- chunks, or n byte chunks plus enough bytes to get to the next end of line or
- header, useful if your chopping up text files. And you can save to another
- device, with pauses to change floppies if you're moving a larger than one
- floppy file etc. It acheives reasonable speed by doing large reads and
- writes. Generally really useful.
-
- This program very closely resembles Chop 3.1 for MSDOS, but believe it or
- not it was written before I saw the MSDOS version. I guess the features for
- this sort of thing are fairly obvious :-).
-
- If you think the source is rough now, you should have seen it before it was
- tidied up :-). It may occasionally produce a zero length file, but not very
- often. Also, if it runs out of buffered data while testing one of the
- search strings, it may say 'Out of range search for end of target', this may
- mean a file will not be split where it should of been, but will be very
- rare. (In fact I don't think it can happen at all since I decided not to
- implement the multi-character wildcard bit). If it says this, it probably
- just means it reached the end of file while testing a search string.
-
- A few examples...
-
- chop dh0:downloads/BBS.cap -b1 -B`0AFrom -Pdh0:msgs/Msg
-
- would take a list of messages captured from a BBS in the file BBS.cap and
- place the separate messages in dh0:msgs/ as Msg.1, Msg.2 etc., assuming each
- message had From at the start of a new line at the beginning.
-
- ...well alright, just one example :-)
-
- Bug reports, comments etc. etc. to
-
- tb@tbnode.equinox.gen.nz or brownt1@lincoln.ac.nz
-
- --- boring bits ---------------------------------------------------------
-
- Chop is freely redistributable, but may not be sold for profit (ha ha). I
- take no responsibility for any damage resulting from its use, use it at your
- own risk. Where trade marks occur in this document, they are trade marks of
- the companies owning them.
-
- --- revision history ----------------------------------------------------
-
- 0.92
-
- * added preceeding zeroes to extensions in chopped bits (useful for joining
- with csh etc.)
-
- * stopped zero length files being created
-
- 0.91
-
- * fixed typo in help text
-
- * added code to avoid crash when output file won't open
-
- * checked for CHR(10)'s in parameters, as added by csh
-
- 0.90
-
- * added all features :-)
-