2.1.5 Protecting against transmission errors
Transmission of shell archives is not always free of errors. So one
should make consistency checks on the receiving site. A very simple
(and unreliable) method is running the UNIX `wc' tool on the output
file. This can report the number of characters in the file.
As one can guess this does not catch all errors. Especially
changing of a character value does not change the computed check sum.
To achieve this goal better method were invented and standardized. One
very strong is MD5 (MD = message digests). This is standardized in RFC
1321. The produced shell scripts do not force the `md5sum' program to
be installed on the system. This is necessary because it is not yet
part of every UNIX. The program is however not necessary for producing
the shell archive.
Do _not_ check with `wc -c' after unpack. The default is to check.
Do _not_ check with `md5sum' after unpack. The default is to
Prepend the prefix character to every line even if not required.
This option may slightly increase the size of the archive,
especially if `-B' or `-Z' is used. Normally, the prefix character
is `X'. If the parameter to the `-d' option starts with `X', then
the prefix character becomes `Y'.
Use STRING to delimit the files in the shar instead of `SHAR_EOF'.
This is for those who want to personalize their shar files.
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