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# ASCII table script, using awk.
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# Author: Joseph Steinhauser
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# Used in ABS Guide with permission.
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#-------------------------------------------------------------------------
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#-- File: ascii Print ASCII chart, base 10/8/16 (JETS-2010)
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#-------------------------------------------------------------------------
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#-- Usage: ascii [oct|dec|hex|help|8|10|16]
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#-- This script prints a summary of ASCII char codes from Zero to 127.
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#-- Numeric values may be printed in Base10, Octal, or Hex (Base16).
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#-- Format Based on: /usr/share/lib/pub/ascii with base-10 as default.
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#-- For more detail, man ascii
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#-------------------------------------------------------------------------
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[ -n "$BASH_VERSION" ] && shopt -s extglob
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oct|[Oo]?([Cc][Tt])|8) Obase=Octal; Numy=3o;;
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hex|[Hh]?([Ee][Xx])|16|[Xx]) Obase=Hex; Numy=2X;;
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help|?(-)[h?]) sed -n '2,/^[ ]*$/p' $0;exit;;
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code|[Cc][Oo][Dd][Ee])sed -n '/case/,$p' $0;exit;;
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export Obase # CODE is actually shorter than the chart!
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awk 'BEGIN{print "\n\t\t## "ENVIRON["Obase"]" ASCII Chart ##\n"
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ab="soh,stx,etx,eot,enq,ack,bel,bs,tab,nl,vt,np,cr,so,si,dle,"
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ad="dc1,dc2,dc3,dc4,nak,syn,etb,can,em,sub,esc,fs,gs,rs,us,sp"
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split(ab ad,abr,",");abr[0]="nul";abr[127]="del";
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fm1="|%0'"${Numy:- 4d}"' %-3s"
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for(idx=0;idx<128;idx++){fmt=fm1 (++colz%8?"":"|\n")
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printf(fmt,idx,(idx in abr)?abr[idx]:sprintf("%c",idx))} }'
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ascii3.sh
