Dans un livre de ce type, il est habituel d'avoir une table ASCII en annexe, sauf que dans ce livre il n'y en a pas. À la place, voici un petit script shell qui génère une table ASCII complète et l'écrit dans le fichier ASCII.txt.
Exemple T.1. Un script qui génère une table ASCII
#!/bin/bash
# ascii.sh
# ver. 0.2, reldate 26 Aug 2008
# Patched by ABS Guide author.
# Original script by Sebastian Arming.
# Used with permission (thanks!).
exec >ASCII.txt # Save stdout to file,
#+ as in the example scripts
#+ reassign-stdout.sh and upperconv.sh.
MAXNUM=256
COLUMNS=5
OCT=8
OCTSQU=64
LITTLESPACE=-3
BIGSPACE=-5
i=1 # Decimal counter
o=1 # Octal counter
while [ "$i" -lt "$MAXNUM" ]; do # We don't have to count past 400 octal.
paddi=" $i"
echo -n "${paddi: $BIGSPACE} " # Column spacing.
paddo="00$o"
# echo -ne "\\${paddo: $LITTLESPACE}" # Original.
echo -ne "\\0${paddo: $LITTLESPACE}" # Fixup.
# ^
echo -n " "
if (( i % $COLUMNS == 0)); then # New line.
echo
fi
((i++, o++))
# The octal notation for 8 is 10, and 64 decimal is 100 octal.
(( i % $OCT == 0)) && ((o+=2))
(( i % $OCTSQU == 0)) && ((o+=20))
done
exit $?
# Compare this script with the "pr-asc.sh" example.
# This one handles "unprintable" characters.
# Exercise:
# Rewrite this script to use decimal numbers, rather than octal.