Traditionally, a book of this sort has an ASCII Table appendix. This book does not. Instead, here are several short scripts, each of which generates a complete ASCII table.
Example T-1. A script that generates an ASCII table
1 #!/bin/bash
2 # ascii.sh
3 # ver. 0.2, reldate 26 Aug 2008
4 # Patched by ABS Guide author.
5
6 # Original script by Sebastian Arming.
7 # Used with permission (thanks!).
8
9 exec >ASCII.txt # Save stdout to file,
10 #+ as in the example scripts
11 #+ reassign-stdout.sh and upperconv.sh.
12
13 MAXNUM=256
14 COLUMNS=5
15 OCT=8
16 OCTSQU=64
17 LITTLESPACE=-3
18 BIGSPACE=-5
19
20 i=1 # Decimal counter
21 o=1 # Octal counter
22
23 while [ "$i" -lt "$MAXNUM" ]; do # We don't have to count past 400 octal.
24 paddi=" $i"
25 echo -n "${paddi: $BIGSPACE} " # Column spacing.
26 paddo="00$o"
27 # echo -ne "\\${paddo: $LITTLESPACE}" # Original.
28 echo -ne "\\0${paddo: $LITTLESPACE}" # Fixup.
29 # ^
30 echo -n " "
31 if (( i % $COLUMNS == 0)); then # New line.
32 echo
33 fi
34 ((i++, o++))
35 # The octal notation for 8 is 10, and 64 decimal is 100 octal.
36 (( i % $OCT == 0)) && ((o+=2))
37 (( i % $OCTSQU == 0)) && ((o+=20))
38 done
39
40 exit $?
41
42 # Compare this script with the "pr-asc.sh" example.
43 # This one handles "unprintable" characters.
44
45 # Exercise:
46 # Rewrite this script to use decimal numbers, rather than octal. |
Example T-2. Another ASCII table script
1 #!/bin/bash
2 # Script author: Joseph Steinhauser
3 # Lightly edited by ABS Guide author, but not commented.
4 # Used in ABS Guide with permission.
5
6 #-------------------------------------------------------------------------
7 #-- File: ascii.sh Print ASCII chart, base 10/8/16 (JETS-2012)
8 #-------------------------------------------------------------------------
9 #-- Usage: ascii [oct|dec|hex|help|8|10|16]
10 #--
11 #-- This script prints out a summary of ASCII char codes from Zero to 127.
12 #-- Numeric values may be printed in Base10, Octal, or Hex.
13 #--
14 #-- Format Based on: /usr/share/lib/pub/ascii with base-10 as default.
15 #-- For more detail, man ascii . . .
16 #-------------------------------------------------------------------------
17
18 [ -n "$BASH_VERSION" ] && shopt -s extglob
19
20 case "$1" in
21 oct|[Oo]?([Cc][Tt])|8) Obase=Octal; Numy=3o;;
22 hex|[Hh]?([Ee][Xx])|16|[Xx]) Obase=Hex; Numy=2X;;
23 help|?(-)[h?]) sed -n '2,/^[ ]*$/p' $0;exit;;
24 code|[Cc][Oo][Dd][Ee])sed -n '/case/,$p' $0;exit;;
25 *) Obase=Decimal
26 esac # CODE is actually shorter than the chart!
27
28 printf "\t\t## $Obase ASCII Chart ##\n\n"; FM1="|%0${Numy:-3d}"; LD=-1
29
30 AB="nul soh stx etx eot enq ack bel bs tab nl vt np cr so si dle"
31 AD="dc1 dc2 dc3 dc4 nak syn etb can em sub esc fs gs rs us sp"
32
33 for TOK in $AB $AD; do ABR[$((LD+=1))]=$TOK; done;
34 ABR[127]=del
35
36 IDX=0
37 while [ $IDX -le 127 ] && CHR="${ABR[$IDX]}"
38 do ((${#CHR}))&& FM2='%-3s'|| FM2=`printf '\\\\%o ' $IDX`
39 printf "$FM1 $FM2" "$IDX" $CHR; (( (IDX+=1)%8))||echo '|'
40 done
41
42 exit $? |
Example T-3. A third ASCII table script, using awk
1 #!/bin/bash
2 # ASCII table script, using awk.
3 # Author: Joseph Steinhauser
4 # Used in ABS Guide with permission.
5
6
7 #-------------------------------------------------------------------------
8 #-- File: ascii Print ASCII chart, base 10/8/16 (JETS-2010)
9 #-------------------------------------------------------------------------
10 #-- Usage: ascii [oct|dec|hex|help|8|10|16]
11 #--
12 #-- This script prints a summary of ASCII char codes from Zero to 127.
13 #-- Numeric values may be printed in Base10, Octal, or Hex (Base16).
14 #--
15 #-- Format Based on: /usr/share/lib/pub/ascii with base-10 as default.
16 #-- For more detail, man ascii
17 #-------------------------------------------------------------------------
18
19 [ -n "$BASH_VERSION" ] && shopt -s extglob
20
21 case "$1" in
22 oct|[Oo]?([Cc][Tt])|8) Obase=Octal; Numy=3o;;
23 hex|[Hh]?([Ee][Xx])|16|[Xx]) Obase=Hex; Numy=2X;;
24 help|?(-)[h?]) sed -n '2,/^[ ]*$/p' $0;exit;;
25 code|[Cc][Oo][Dd][Ee])sed -n '/case/,$p' $0;exit;;
26 *) Obase=Decimal
27 esac
28 export Obase # CODE is actually shorter than the chart!
29
30 awk 'BEGIN{print "\n\t\t## "ENVIRON["Obase"]" ASCII Chart ##\n"
31 ab="soh,stx,etx,eot,enq,ack,bel,bs,tab,nl,vt,np,cr,so,si,dle,"
32 ad="dc1,dc2,dc3,dc4,nak,syn,etb,can,em,sub,esc,fs,gs,rs,us,sp"
33 split(ab ad,abr,",");abr[0]="nul";abr[127]="del";
34 fm1="|%0'"${Numy:- 4d}"' %-3s"
35 for(idx=0;idx<128;idx++){fmt=fm1 (++colz%8?"":"|\n")
36 printf(fmt,idx,(idx in abr)?abr[idx]:sprintf("%c",idx))} }'
37
38 exit $? |