The builtin manual of ksh's "read" says:
"-N nbyte Read exactly nsize characters.
For binary fields size will be in bytes."
I've tried to read single bytes with "read -N1". The following, using
"od", works as expected and thus confirms that "read -N1" is working:
#!/bin/ksh
exec 3< hexfile ## file of 256 bytes: 0, 1, 2, 3, ... 255
while read -u3 -r -N1 B
do
H=$(printf "$B" | od -tx1 -An)
print ${H:=" 00"}
done | less
exec 3<&-
But I want to compare $B to constant values, and print $B as ascii-hex,
and I'd like to avoid using external application "od". If I declare B
with "typeset -is", or "typeset -i", or "typeset -b", the result is
"arithmetic syntax error" or nonsense. Behavior is the same for locale
"C" and "en_ZA.utf8". Of course it can be done (ksh can do anything!)
but please tell me, "How?".
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