Why is m4 -D option not doing a substitution

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                          How does -DQUOTE=yes work in the code below? 

I expected the second line to be ifelse(yes,yes,Learn Linux today!)

The other parts make sense to me. 

From Linux Pocket Guide - by Daniel J. Barrett 

    $ cat myfile 
    My name is NAME and I am AGE years old.
    ifelse(QUOTE,yes,Learn Linux today!)

    $ m4 -DNAME=Sandy -DAGE=25 -DQUOTE=yes myfile
    My name is Sandy and I am 25 years old.
    Learn Linux today!

Asked by PurpleMongrel (63 rep)

Nov 18, 2021, 05:53 AM
Last activity: Nov 18, 2021, 06:12 PM

Why is m4 -D option not doing a substitution

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