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#!/bin/bash
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# m4.sh: Using the m4 macro processor
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# Strings
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string=abcdA01
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echo "len($string)" | m4 # 7
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echo "substr($string,4)" | m4 # A01
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echo "regexp($string,[0-1][0-1],\&Z)" | m4 # 01Z
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# Arithmetic
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echo "incr(22)" | m4 # 23
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echo "eval(99 / 3)" | m4 # 33
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exit 0
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