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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.
-w
--no-character-count
Do not check with `wc -c' after unpack. The default is to check.
-D
--no-md5-digest
Do not check with `md5sum' after unpack. The default is to check.
-F
--force-prefix
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'.
-d string
--here-delimiter=string
Use string to delimit the files in the shar instead of `SHAR_EOF'. This is for those who want to personalize their shar files.
This document was generated by Bruce Korb on June, 3 2006 using texi2html 1.76.